The ^1H NMR spectral data for compound A are given below. ANSWER A)… Question: Deduce the structure of an unknown compound using the data below. From the spectra, determine the structure of the molecule. 9, 134. 2, 124. Deduce the structure of a compound with molecular form 1H NMR spectrum: C9H12 that produces the following Proton NMR Chemical Shitt (ppm 18. 27 (2𝐻, q, 𝐽=7 Hz). Jun 13, 2020 · You already found out that compound is aromatic by FT-IR, and hence $\ce{C6}$ of the formula counted out with 4 unsaturaations (3 double bond and a ring for aromatic nucleus). 9(2H,d,J =9 Hz);δ7. 4, δ 26. The remaining unsaturation could be a double bond or a ring. Explanation: The structure of the unknown compound C5H10O can be deduced using the data provided by the NMR spectrum. 48 (sextet, 2H), 2. 9 (2 H, d, J = 9 Hz) ppm. There are 4 steps to solve this one. 82 (6H, s), 8 8. molecular formula C7H7BrOC7H7BrO C13C13 NMR: 7 peaks IR: 680 (s) and 765 (s) cm−1. However, we’ve seen that IR spectroscopy can a great technique for identifying certain functional groups in an unknown molecule – especially functional groups containing OH or C=O. predict the number of peaks expected in the 1 H or 13 C NMR spectrum of a given compound. 4 (3H, t, J = 8 Hz); δ 2. 34 9. Deduce the structure of an unknown compound using the data below: Molecular mass: 70. C5H,00: NMR: 89. The following spectroscopic data below corresponds to an unknown carbonyl compound with the molecular formula C8H12O. Select Draw Rings Erase 2 a Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. 100% (1 rating) Question: 16. An unknown compound, V, has the formula C 8 H 10 O. You do not have to explicitly draw H atoms. Deduce the structure of an unknown compound using A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The following spectroscopic data corresponds to an unknown compound with the molecular formula C_4H_7O_2Br. Spectroscopy shows ho Deduce the structure of an unknown compound using the data below. 03 (3 H, s); 8 2. Feb 24, 2023 · Deduce the structure of C₆H₁₂O, consider the IR, ¹H NMR, and ¹³C NMR spectra. Molecular formula = CH. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. CH. Question: An unknown with a molecular formula of C6H12O. Draw your structure in the drawing window. By itself, Infrared (IR) spectroscopy isn’t a great technique for solving the structure of an unknown molecule. molecular mass 113; gives a positive hydroxamate test; IR: 2237,1733,1200 cm−1; H1 NMR: 𝛿 1. Deduce the structure of an unknown compound using the data below: Molecular Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. IR: 3280, 1653, 898 cm-1;… A: The expression for the degree of unsaturation is shown below: Degree of unsaturation = C -H2 -X2 +… Here’s the best way to solve it. The quartet at 4. Doublet (2H) at ~7 Use the data to deduce the structure of the compound? An unknown compound with molecular formula C5H12 O has the data shown below: Solution for Deduce the structure of an unknown compound with the molecular formula of C5H₁2O using the information given by its infrared spectrum. Question: Deduce the structure of an unknown compound using the data below: Molecular Formula: C10H12O2 IR: 1690 cm-1, 1612 cm-1 NMR: δ 1. 'H NMR 2 H OH 5. 0 80 20 0. 2, 23. In order to determined the molecular formula of our compound from this data, we first need to know its molar mass. 01 (2H, quintuplet, J 7 Hz); 3. 9 ( 2 H , d , J = 9 Hz ) ppm This is a NMR spectroscopy question, please highlight your answers as clearly as possible, thanks. This piece of information, as you recall from chapter 4, we determine by looking at the 'molecular ion peak' in the mass spectrum of our compound. There are 2 steps to solve this one. The IR spectrum data with peaks at 1690 cm⁻¹ and 1612 cm⁻¹ could indicate the presence of a C=O and a C=C functional group, respectively. Explanation: Deduce the structure of an unknown compound using the data. Identification of an Unknown: Alcohols, Aldehydes, and Ketones . There are 6 non-H bond (s), 1 multiple bond (s), 2 rotatable bond (s), 1 double bond (s), 1 hydroxyl group (s), and 1 primary Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. Deduce and draw the structure of the molecule from the data below. There are 3 steps to solve this one. Feb 7, 2020 · The compound with the given molecular formula and NMR data is ethyl acetate, which has the structure CH3-C(=O)-O-CH2-CH3. Deduce the structure of the compound from these data. The degree of unsaturation ( DBE) can be calculated by using the followi aw the structure that fits the following data Molecular formula: C6H12O H NMR spectral data ö (ppm) 0. The Unsaturated alcohol molecule contains a total of 18 bond (s). “triplet”). 4 (3H, t, J = 8 Hz); 6 2. Deduce a structural formula for this compound. 8 (CH_2), 112. 1(2H,q,J = 8 Hz);δ6. . How does one determine the identity and structure of an unknown compound? This is not a trivial task. Spectroscopy involves the interaction of matter with electromagnetic radiation. Mar 7, 2023 · The unknown compound C5H10O, based on its NMR data, can be deduced as 2-methylbutanal, featuring an aldehyde group and a tertiary butyl group. Label all significant peaks on the IR spectrum with the functional group to which they correspond Indicate whether or not the 13C NMR spectrum denotes symmetry in Question: Given the molecular formula and^13 C NMR data (in ppm) below, deduce and draw the structure of the unknown compound. 0: NMR: 8 2. Given the molecular formula and spectral data below, deduce the structure of an unknown compound. The letter \"m\" refers to an uninterpretable multiplet in the spectra. Intensity (peak): Frequency (cm–1): m 3300 m 2900 m 2800 m 1465 m 1450 m. Deduce the structure of an unknown compound using the data below: Molecular Formula: C10H1202 IR: 1690 cm"!, 1612 cm-1 NMR: 5 1. 4 ( 3 H , t , J = 8 Hz ) ; δ 2. 3 ppm. 38 (2H, q, J = 8 Hz) ppm Mar 19, 2020 · Final answer: The unknown compound is proposed to be cyclohexanone, supported by its IR absorption at 1705 cm-1 indicative of a carbonyl group, 1H NMR data showing no highly deshielded protons, and 13C NMR chemical shifts pointing to a ketone carbon and the absence of unsaturated carbons. Molecular formula: C3H8O 3C NMR: 120. Question: what is the structure of an unknown compound with molecular formula C6H15N that gives the following 1H NMR absorptions: 0. 38 (2H, q, J = 8 Hz) ppm Transcribed Image Text: Use the data below from an electron impact mass spectrum of a pure compound to deduce its structure. 8 (1H, s), 8 1. 5 (3 H, s); 5 4. Our expert help has broken down your problem into an easy-to-learn solution you can count on. 5 (3H, s); δ 4. 1 (m, 4H), and 9 Jun 25, 2023 · Using the given molecular formula and IR data, the unknown compound likely contains a benzene ring and a carbonyl functional group, with p-methylbenzoic acid as a possible structure. This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Quartet (2H) at ~4. Frequency (cm) 2950 1750, 2850 intensity m m m (b) (c) (d) (a) но. 13 (4H, s) IR: 1681 cm-?, no 0-H stretch. Modern x-ray and spectroscopic techniques have made the job much easier, but for some very complex molecules, identification and structure determination remains a challenge. A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. Elucidate the structure of V by scrutinizing its IR, 1 H NMR and 13 C NMR spectra, shown below. Deduce the structure of an unknown compound of C12H140e using the following 'H NMR spectrum, mass spectroscopy data, and IR spectrum. Step 1. Q8. Compound A absorbs strongly in the IR at 1700 cm^{-1}. 9(2H,d,J =9 Hz)ppm Deduce the structure of the Here’s the best way to solve it. Question: The 1H NMR spectrum below corresponds to an unknown compound with the molecular formula C4H7Cl. 10 (triplet, 3H), 1. Molecular Formula: C 10 H 12 O 2 IR: 1690 cm − 1 , 1612 cm − 1 NMR: δ 1. Draw. Deduce the structure of an unknown compound using the given data. Briefly explain how you came up with the structure. Question: Deduce the structure of an unknown compound using the data below: Molecular Formula: C_0H_12O_12 IR:1690 cm^-1, 1612cm^-1 NMR: Delta 1. 1 (2 H, q,J=8 Hz); 5 6. 0 5. 0 3. 1H NMR: δ 0. 2 ppm. Deduce the structure of an unknown compound using the data below: Molecular Formula: C10H12O2 IR: 1690 cm-1, 1612 cm-1 NMR: δ 1. 1 IR absorption at 1780 cm^(-1) NMR: Mar 1, 2016 · I have a homework problem where I'm to draw the structure of a compound of molecular formula CX10HX12OX2 C X 10 H X 12 O X 2 using the following IR data and 1 1 H NMR spectrum: IR absorption at 1718 cm −1 − 1. 95 (3 H, I, J = 8 Hz), 82. 0. 4 ppm. 8, 22. Explanation: The task is to deduce the structure of an unknown compound using the provided data: molecular formula C10H12O2, with IR peaks at 1690 cm−1 and 1612 Question: The following spectroscopic data below corresponds to an unknown carbonyl compound with the molecular formula CsH120. 17. Question: Deduce the structure of an unknown compound from the spectroscopic and other data. Frequency (cm-1):2900,2880,2820,2720,1720,1465, 1450,1375. 2 and 212. explain the difference in time scales of NMR and infrared spectroscopy. Deduce and draw the structure of the molecule that corresponds to 1. Molecular formula: C_4H_8O IR: 1717 cm^-1, no IR absorptions above 3100 cm^-1. Molecular Formula: C10H12O2 IR:1690 cm−1,1612 cm− NMR: δ1. Question: 10) Deduce the structure of the unknown compound C12H10O using the spectra provided below:10) Deduce the structure of the unknown compound C14H10O using the spectra provided below:10) Deduce the structure of the unknown compound C14H10O using the spectra provided below: Question: Deduce the structure of an unknown compound from the spectroscopic and other data. 7 46 22 31 100 29 30 27 22 Number 2- m/z. 18 (triplet, 3H) ppm. C 6 H 1 2 O: \ delta 2 9. The type of carbon, as revealed from DEPT spectra, is specified in each case. 0 70 6. 29 ppm (quartet, 4H) 8 = 7. NMR δ 0. Question: Deduce the structure of an unknown compound using the data below: Molecular mass: 70. An unknown compound A has the molecular formula C_7H_{14}O_2. Use your knowledge of such techniques to identify the compounds described below. 03 (3H, s): delta 2. Deduce the structure of the following unknown compounds using their spectral data. C_4 H_8 (CH_3), 25. The 'H NMR spectrum below corresponds to an unknown compound with the molecular formula C H/CI. Deduce the structure of an unknown compound using the data below. 78 (t, 1H) ppm. Answer to Solved Deduce the structure of an unknown compound using the | Chegg. C5H10O : NMR: δ9. 1 (9H4 s) Question: Deduce the structure of an unknown compound using the data. Answer to: Deduce and draw the structure of an unknown compound using the data below: Molecular mass: 70. 5 ( 3 H , s ) ; δ 4. 63) Deduce the structure of a compound with molecular formula C8H10O that exhibits the following IR, 1H NMR, and 13C NMR spectra. 15 (s, 3H), 2. 1 IR absorption at 1780 cm^-1 NMR: 2. Question: Deduce the structure of an unknown compound using the data. The NMR spectrum shows two signals, one at 9. 54 (triplet, 2H), 2. 9 2. 8 (1H, s), 81. 9 (2H, d, J = 9 Hz Here’s the best way to solve it. com. 8 ppm (1H, s) and one at 1. 95 (3H, t, J = 8 Hz), delta 2. 33 (3𝐻, t, 𝐽=7 Hz), 𝛿 3. Deduce the structure of the compound with formula C8H11N that produced the IR spectrum below. Based on the spectral data, determine the structure of the compound. The given molecular formula is C 6 H 12 O. Bry Draw the unknown compound. 09 (4H, t, J = 7Hz) I need help with this carbonyl NMR problem. 0, 134. A pair of peaks separated by 2 amu with an intensity ratio of 3:1 indicates that the Our expert help has broken down your problem into an easy-to-learn solution you can count on. From this information and its ^ H-NMR spectrum shown below, deduce the structure of this compound. 8 (1H, s), 𝛿 1. Show transcribed image text. 60 (m, 4H), 2. 30 ppm (triplet, 6H) 8 -4. 1 (2H, q, J = 8 Hz); δ 6. 72 Integration Multiplicity 6 4 triplet multiplet multiplet doublet 3C NMR spectrum 180 160 100 δ Question: Deduce the structure of an unknown compound using the data. 1 IR absorption at 1780 cm NMR: o2. Explanation: The compound with the molecular formula C4H8O2 and given NMR spectroscopic data is ethyl acetate. Previous Step 1. Analyze the spectra to match the compound's molecular formula and possible functional groups. The 'H NMR spectrum below corresponds to an unknown compound with the molecular formula C4H8O. 9 ppm (multiplet, 4H) Mass Spectrum: m/e: Intensity: (as % of base peak) 222 10% 177 38% 149 100% IR Spectrum: Intensity (peak): Frequency (cm): strong 3100 medium (m) 2900 medium explain the number of peaks occurring in the 1 H or 13 C NMR spectrum of a simple compound, such as methyl acetate. The ester above fits the molecular formula and the NMR data, but not the IR data. Molecular formula: C4H8O IR: 1717 cm-1, no IR absorptions above 3100 cm-1. The letter "m" refers to an uninterpretable 10) Deduce the structure of the unknown compound C11H14O3 using the spectra provided below: Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. 38 (2H, q, J = 8 Hz) ppm. 5(3H,s);δ4. 5, 144. 2 5. Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. Share Share. Deduce the structure of a compound with a molecular formula C_8H_{14}O_4 and the following IR, ^1H-NMR, and ^{13} C-NMR spectra. 3, 193. Deduce the structure of an unknown compound using the data below: Molecular Formula: C_10H_12O_2 IR 1690 cm^-1, 1612 cm^-1. 95 (3H, t, J = 8 Hz), δ 2. Esters would be expected to have a stretch 1730 cm^-1. The CYCLOHEXANOL molecule contains a total of 19 bond (s). 67 (singlet, 3H), 3. 1 (9H, s) Deduce the structure of the unknown compound. However, without additional information, it is not possible to determine the exact structure of the compound Determine the structure of the C 6 H 12 O compound that gives the following spectra. Question: Deduce the structure of an unknown compound using the data below. 9 (2 H, d,J=9 Hz); 5 7. Chemistry. 8 0 ( quartet), 3 0. 4 (3H, t, J=8 Hz Step 1. 9 (singlet, 1H), 1. Significant signals observed are below. 5 3 ( triplet), 2 0 3. It helps in providing the information about structure and interactions within the molecule. describe, and sketch a diagram of, a simple NMR spectrometer. Rearrange the fragments to give a different carbonyl. Based on the NMR and IR data, we can deduce that the unknown compound has two different types of hydrogen atoms and does not contain any hydroxyl groups. Answer to: Deduce the structure of an unknown compound using the data below: Molecular mass: 70. 100 80 g 60 叵40 20 4000 3500 3000 2500 Chemical Structure Description. 38 (2H, q, J = 8 Hz) ppm Deduce the structure of the unknown compound. Question: Use the data below from an electron impact mass spectrum of a pure compound to deduce its structure. 1 ppm (9H, s). The 1H NMR data indicates three different types of hydrogen environments. The IR frequenc …. 1 IR absorption at 1780 cm-1 NMR: 2. Here’s the best way to solve it. Resonances at δ 44. 9 (2H, d, J = 9 Hz); δ 7. 8 2 ( singlet), 5 6. 89 (triplet, 2H) ppm. 8 (1H,s),δ1. 1H NMR spectrum: 8 -1. 01 (2H, quintuplet, J =7 Hz); 3. Deduce and draw the structure of the compound that corresponds to the data The letter "m" refers to an uninterpetable multiplet in the spectra H NMR: 5 1. 09 (4H, t, J 7 Hz) Not the question you’re looking for? Science. 4(3H,t,J = 8 Hz);δ2. Deduce and draw the structure of the compound that corresponds to the data 1H NMR: δ 4. Deduce the structure of a compound with molecular formula C6H1402 that exhibit the following IR, 1H NMR, and 13C NMR spectra. 03 (3H, s); delta 2. Mass Spectrum The highest molecular weight ion usually corresponds to the molecular ion, and hence gives the molecular weight of the compound. 55 (d, 3H), 3. 8 5. 1 (9H,s) Deduce the structure of the unknown compound. The remaining number of unsaturarion is $5-4=1$, and remaining number of $\ce{C}$ in the formula is 3. 90 (q, 1H), 7. 4 2. Question: Deduce the structure of an unknown compound with the molecular formula of C5H12O using the information given by its infrared spectrum. What is the structure of ; Deduce the structure of a compound with a molecular formula C_8H_{10}O and the following 1R-^1H-NMR, and ^{13}C-NMR spectra. 1 ( 2 H , q , J = 8 Hz ) ; δ 6. 1 (9H4 s) Deduce the structure of an unknown compound using the following 1H NMR spectrum, mass spectroscopy data, and IR spectrum. Deduce the structure of an unknown compound using the data. 1 (2H, 9, J = 8 Hz); 66. 7 2H 2H Incorrect 1H TH (CH3) Si There is an alkene and an alcohol in the unknown compound, but the Aug 9, 2023 · This suggests that the compound does not contain any hydroxyl groups (–OH). Deduce the structure of an unknown compound using the data below: Molecular Formula: C _10 H_12 O_2 IR: 1690 cm^-1, 1612 cm^-1 NMR: 5 1. 9 (2H, d, J = 9 Hz) ppm 10) Deduce the structure of the unknown compound C15H12O2 using the spectra provided below, (partial credits will be given). 6 ppm. 45 (2𝐻, s), 𝛿 4. 1(9H,s) Deduce the structure of the unknown compound. 5 (3H, s); 6 4. 8(1H,s),δ1. A compound of unknown structure gave the following spectroscopic data: (a) Assuming that the compound contains C and H but may or may not contain O, give three possible molecular formulas. 2, and δ 212. Do not include long pairs in your answer. 03 (3H, s); δ 2. The molecular formula Is C_8H_8O. Number 1- m/z Relative Intensity 47 0. 94 (t, 3H), 1. For full credit be sure to Calculate the degrees of unsaturation from the molecular formula . There are 7 non-H bond (s), 1 six-membered ring (s), 1 hydroxyl group (s), and 1 secondary alcohol (s). Question: The^1H NMR spectrum below corresponds to an unknown compound with the molecular formula C_4H_8O. For each proton resonance, give the descriptive name of its coupling pattern (ie. 0 (CH) Show transcribed image text. The 1 H- and 13 C-NMR data for an unknown compound with molecular formula are shown below. 6 (quartet, 2H) ppm? Draw 61. 13C NMR: 21. 6 ppm 4. Through this technique we can study the magnetic properties of nuclei. ^13C NMR: delta 170, 51, 37, 25 ppm. Deduce the structure of an unknown compound from the spectroscopic and other data. 01 (2H, Question: 9) Deduce the structure of an unknown compound with molecular formula C5H80 using information given by its infrared spectrum Frequency (cm−1):3100,2800,1705,1640,1450,1375 10) The following IR spectrum belongs to which of the following compounds? Deduce the structure of an unknown compound using the data. The following spectroscopic data corresponds to an an unknown compound with the molecular formula C4H8O2. ^1H NMR: delta 3. (This is the only information provided for this question) Show transcribed image text. Doublet (2H) at ~7. 15 (singlet, 9H), and 2. "C NMR: δ 170, 60, 20, 14 ppm. Suggest a structure for a compound with the molecular formula C_9H_9NO_4 that is consistent with the following ^1H \ NMR data: 1. NMR delta 0. 19 (m, 4H), and 6. Deduce the identity of the following compound from the 1 3 C NMR data given. May 6, 2023 · Deduce the structure of an unknown compound using the data below: Molecular Formula: C6H12O IR: 1705 cm-1 1H NMR: no absorptions greater than δ 3 ppm 13C NMR: δ 24. Clearly show stereochemistry where applicable. The structure of the unknown compound with the molecular formula: C₁₀H₁₂O₂ can be deduced through the combined analysis of its IR and NMR spectra. molecular mass 113; gives a positive Feb 28, 2016 · 133/15 Calculator Periodic Table 2/28/2016 11:55 PM Print Cakintor -d Periodic Title Question 8 of 20 Map Deduce the structure of an unknown compound using the data below: Molecular Formula: CHO IR: 1705 cm NMR: no absorptions greater than δ 3 ppm aC NMR: δ 24. Steps to deduce the structure of any unknown organic compound having known molecular formula and other supportive spectroscopic data and other clues: Step 1: To determine the unknown molecular structure of any unknown compound with empirical molecular formula (CxHyOz), first step is the identification of Double Bond Equivalent (DBEs) Chemistry. 4-7. 07 ppm corresponds to The infrared spectrum of an unknown compound with molecular formula C_6H_12O shows a strong, sharp peak at 1724 cm^-1. C5H10O: NMR: 𝛿 9. Singlet (3H) at ~2. 3 2. Deduce and draw the structure of the molecule that corresponds to the data below. 8-7. 4, δ 44. 53 2. Nov 29, 2016 · IR Spectroscopy Practice Problems. 6 have very low intensity. Question: Using the provided spectral data, deduce the structure of the unknown compounds below Q: Deduce the structure of an unknown compound using the data. The The^1H NMR spectrum below corresponds to an unknown compound with the molecular formula C_3H_4CI_2. 10) Deduce the structure of the unknown compound C11H14O3 using the spectra provided below: This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Deduce the structure of an unknown compound with molecular formula C5H80 using information given by its infrared spectru IR Spectrum Frequency (cm) Peak intensity m m S 3100 2800 1705 1640 1450 1375 m-w m m HO d) b) 4 The major bands in the infrared spectrum of ethyl cyanoacetate will be: 3150 cm-1; 2200 cm-1 Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. Organic chemists use a variety of methods to identify unknown compounds. C,H O: NMR: 89. Answer. 16. Question: tion 12 of 20 > Deduce the structure of an unknown compound using the data. Chemistry questions and answers. 1 (9 H, s)… A: To draw the structure of the compound , we would use given condensed formula and given NMR data . Images of the chemical structure of CYCLOHEXANOL are given below: Q: Provide a structure for the compound C,H13N using the given information. Expert-verified. Question: The following spectroscopic data below corresponds to an unknown carbonyl compound with the molecular formula CH120. Deduce and draw the structure of the compound that corresponds to the data. 63) Deduce the structure of a compound with molecular formula C 8 H 10 O that exhibits the following IR, 1 H NMR, and 13 C NMR spectra. View the full answer. 90 1. Question: Deduce the structure of an unknown compound using information given by its infrared spectrum. 1 (CH_2), 139. NMR Data: Triplet (3H) at ~1. You do not have to consider stereochemistry. 2, Its infrared and 1 H nmr spectra are shown below. 21 (q, 2H), 5. Question: 10) Deduce the structure of the unknown compound C12H10O using the spectra provided below:10) Deduce the structure of the unknown compound C14H10O using the spectra provided below:10) Deduce the structure of the unknown compound C14H10O using the spectra provided below: Question: 1725 1480 ICLO-S) Deduce the structure of an unknown compound using its infrared spectrum data below. 4 (3H, t, J = 8 Hz); 5 2. Likely structures could include 2-hexanone or 3-hexanol, based on characteristic bands and chemical shifts. 3 6 ( doublet) ( ppm) Express your answer as a chemical formula. The aim is to identify the given molecular formula using spectral data and deduce its structure. 1, 128. When the molecular formula of a compound is known, spectroscopic and other analytical techniques are used to distinguish between possible structural isomers. 07 (quartet, 2H), 1. 9 ( 2 H , d , J = 9 Hz ) ; δ 7. 97 (singlet, 3H), 1. Molecular formula: CHO IR: 1717 cm-, no IR absorptions above 3100 cm-! NMR 80. 9 (2H, d, J = 9 Hz) ppm. xq sw jc hh vo yz ig ah km pl