Homework Answers
NMR structural analysis
15.
Formula = C4H10O
Degree of unsaturation = 0
13C NMR showed,
19 ppm for the two CH3 carbons
31.7 ppm for CH carbon
69.5 ppm for CH2 carbon next to oxygen
Dept-90 : showed one peak at 31.7 ppm for CH carbon
Dept-135 : showed two peaks, 19 ppm +ve for CH3 carbons and 69.5 ppm as -ve peak for CH2 carbon
Possible structure of compound,
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15. Determine the degrees of unsaturation and then propose a structure for a compound, CaHoO with...
33. Propose a structure for Compound X, which has M -120 and (M+2)-122 of approximately equal...
33. Propose a structure for Compound X, which has M -120 and (M+2)-122 of approximately equal intensity in its mass spectrum and has the following "C NMR spectral data: (5 points) Broadband decoupled "C NMR: 32.6, 118.8, 134.3 ppm DEPT-90: 134.3 ppm DEPT-135: positive peaks at 134.3 ppm; negative peaks at 32.6, 118.8 ppm
Please give step by step to figuring this out. Please and thank you. (6 pts) Propose...
Please give step by step to figuring this out. Please and thank you. (6 pts) Propose a structure for a compound with the the following spectral data. Parent Peak on Mass Spec: 87 IR: medium single peak at 3350 cm-1 Broadband decoupled 13C-NMR 21, 29, 37, 61 δ DEPT-90: 29 δ DEPT-135: positive peaks at 21, 29, 37 δ negative peaks at 61 δ 1H-NMR: 2.42 δ (3 H, singlet) 2.41 δ (2 H, doublet)...
Hi! can you please explain step by step how i would go about proposing a structure for this? I know that DEPT-90 shows...
Hi! can you please explain step by step how i would go about
proposing a structure for this?
I know that DEPT-90 shows CH groups & DEPT-135 shows CH
& CH3 in the positive region and CH2 in the negative region. I
also know that the normal graph shows the C's. However, i have
answer to this question, but I have no idea how they came up with
it. Can you please explain step by step your rationale how to...
Need help proposing a structure given the following data. Thank you. 20. A compound with the...
Need help proposing a structure given the following
data. Thank you.
20. A compound with the formula C5H100 exhibits the following C NMR signals Broadband decoupled: 207, 45, 28, 16, and 12 ppm DEPT-90: no signals DEPT-135: positive signals at 28 and 12 ppm, negative signals at 45 and 16 ppm.
a) Grignard reagents react with oxirane (ethylene oxide) to form 1° alcohols but can be prepared...
a) Grignard reagents react with oxirane (ethylene oxide) to form 1° alcohols but can be prepared in tetrahydrofuran (THF) solvent. Why is this difference in behavior observed? Explain clearly b) A compound has the formula CsHio, with the 13C and IH NMR spectral data shown. Propose a structure that fits this data. BC NMR Broadband decoupled 13C NMR: 23.5, 26.7, 68.9 δ DEPT-90: no peaks DEPT-135: no positive peaks negative peaks at 23.5, 267, 689 δ HNMR 1.7 δ, multiplet...
Pre-lab Assignment: On Separate sheet (to turn in) 1. A compound with molecular formula CsH10Br2 displays...
Pre-lab Assignment: On Separate sheet (to turn in) 1. A compound with molecular formula CsH10Br2 displays the following 13C NMR along with the DEPT-90 and DEPT-135 13CNMR spectra. What is the structure for this compound? DEPT-90 DEPT-135 Broadband decoupled 5 ppm 10 15 25 30 35 45 50 55 60 65 70 75 -20 -40
2. (10 points) The proton NMR spectrum of a compound with a formula CsH100 is shown....
2. (10 points) The proton NMR spectrum of a compound with a formula CsH100 is shown. The decoupled carbon-13 and DEPT results are show in the table. The infrared spectrum shows a broad peak at about 3340cm and a medium peak about 1650 cm. Draw a structure for this compound and explain the data. Decoupled "CNMR, DEPT- DEPT-90 ppm 135 22.2 positive no peak 40.9 negative no peak 60.2 negative no peak 112.5 negative no peak 142.3 no peak no...
Propose a structure that fits the following spectroscopic data: C5H10O IR: 1716 cm−1 Broadband decoupled 13C...
Propose a structure that fits the following spectroscopic data: C5H10O IR: 1716 cm−1 Broadband decoupled 13C NMR: 7.93, 35.50, 212.07 δ DEPT Experiments show: signal at 7.93 δ as CH3 and signal at 35.50 δ as CH2
Determine the correct structure of the compound, which shows following 13C NMR DEPT-135 data is 13C...
Determine the correct structure of the compound, which shows following 13C NMR DEPT-135 data is 13C NMR DEPT-135: negative peaks at δ30.2, 31.9, 61.8, 114.7 ppm; positive peak at 130.4 ppm
) A compound with molecular formula CxH 1403 displays the following spectral data. Propose a structure...
) A compound with molecular formula CxH 1403 displays the following spectral data. Propose a structure for this compound in the box at the bottom of the page. Peak assignments written on the spectra may be worth partial credit. (5 marks) r IR Spectrum liquid film) 1735 1717 4000 3000 1200 800 2000 1600 V (cm) 13C NMR Spectrum (100 MHz, CDCI, solution) DEPT CHI Chit Cht solvent proton decoupled 100 no Sloml proton decoupled 200 160 120 80 40...
33. Propose a structure for Compound X, which has M -120 and (M+2)-122 of approximately equal intensity in its mass spectrum and has the following "C NMR spectral data: (5 points) Broadband decoupled "C NMR: 32.6, 118.8, 134.3 ppm DEPT-90: 134.3 ppm DEPT-135: positive peaks at 134.3 ppm; negative peaks at 32.6, 118.8 ppm
Hi! can you please explain step by step how i would go about
proposing a structure for this?
I know that DEPT-90 shows CH groups & DEPT-135 shows CH
& CH3 in the positive region and CH2 in the negative region. I
also know that the normal graph shows the C's. However, i have
answer to this question, but I have no idea how they came up with
it. Can you please explain step by step your rationale how to...
Need help proposing a structure given the following
data. Thank you.
20. A compound with the formula C5H100 exhibits the following C NMR signals Broadband decoupled: 207, 45, 28, 16, and 12 ppm DEPT-90: no signals DEPT-135: positive signals at 28 and 12 ppm, negative signals at 45 and 16 ppm.
a) Grignard reagents react with oxirane (ethylene oxide) to form 1° alcohols but can be prepared in tetrahydrofuran (THF) solvent. Why is this difference in behavior observed? Explain clearly b) A compound has the formula CsHio, with the 13C and IH NMR spectral data shown. Propose a structure that fits this data. BC NMR Broadband decoupled 13C NMR: 23.5, 26.7, 68.9 δ DEPT-90: no peaks DEPT-135: no positive peaks negative peaks at 23.5, 267, 689 δ HNMR 1.7 δ, multiplet...
Pre-lab Assignment: On Separate sheet (to turn in) 1. A compound with molecular formula CsH10Br2 displays the following 13C NMR along with the DEPT-90 and DEPT-135 13CNMR spectra. What is the structure for this compound? DEPT-90 DEPT-135 Broadband decoupled 5 ppm 10 15 25 30 35 45 50 55 60 65 70 75 -20 -40
2. (10 points) The proton NMR spectrum of a compound with a formula CsH100 is shown. The decoupled carbon-13 and DEPT results are show in the table. The infrared spectrum shows a broad peak at about 3340cm and a medium peak about 1650 cm. Draw a structure for this compound and explain the data. Decoupled "CNMR, DEPT- DEPT-90 ppm 135 22.2 positive no peak 40.9 negative no peak 60.2 negative no peak 112.5 negative no peak 142.3 no peak no...
) A compound with molecular formula CxH 1403 displays the following spectral data. Propose a structure for this compound in the box at the bottom of the page. Peak assignments written on the spectra may be worth partial credit. (5 marks) r IR Spectrum liquid film) 1735 1717 4000 3000 1200 800 2000 1600 V (cm) 13C NMR Spectrum (100 MHz, CDCI, solution) DEPT CHI Chit Cht solvent proton decoupled 100 no Sloml proton decoupled 200 160 120 80 40...
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