Homework Answers
IR peak at 1710 cm-1 indicates C=O
Formula C8H14O , degree of unsaturation = ( nC x 2 + 2- nH) / 2 = ( 8 x 2 + 2 - 14) / 2 = 2
thus we have two double bonds , so apart from C=O we had another pie bond
H-NMR peak at 5 ppm indicates =C-H
peak at 1.5ppm and 1.6 ppm two CH3 being singlet indicates CH3 adjacent to Carbon with no Hydrogens. It could be double bonded carbon.
Peak at 2.4 ppm triplet 2H indicates CH2 adjacent to CH2 and electronwithdrawing group C=O
Peak at 2.2 ppm quatret indicates CH2 adjacent to CH2 and another CH.
Peak at 2.1 ppm 3H singlet indicates CH3 adjacent to C=O.
Joining fragments we get the structure
Add Answer to:
4. Formula-CsH40 48- 3sa 3000 2000 1000 3H 3H 3H 2H 2H 1H Г 1.4 PPM qamrymn 5.4 5.2 5.b 4.8 4.6 4.4 4.2 PPM 1.b 2.2...
Find the structure of C8H14O based on its IR and NMR data 4. Formula-CsHiO 1 1000 1580 2580 2808 2000 3se 4080 3H 3...
Find the structure of C8H14O based on its IR and NMR data
4. Formula-CsHiO 1 1000 1580 2580 2808 2000 3se 4080 3H 3H 3H 2H 2H 1H pr gr 2.0 1.B 2.2 1,6 2.4 1.4 PP 5.4 5.2 5.0 4.8 4.6 4.4 4.2 PPM P1'1I LE 6ST L'BTLT
4. Formula-CsHiO 1 1000 1580 2580 2808 2000 3se 4080 3H 3H 3H 2H 2H 1H pr gr 2.0 1.B 2.2 1,6 2.4 1.4 PP 5.4 5.2 5.0 4.8 4.6 4.4...
Write down problem number. Provide formula, HDI value, and a complete, chemically correct structure for each...
Write down problem number.
Provide formula, HDI value, and a complete, chemically correct
structure for each problem.
Assign signals in the 1H and 13C spectra to specific atoms,
identify structural units and/or functional groups.
Example:
Problem # 3
Formula: C8H8O2
HDI: 5
1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
2.42 ppm, COOH proton at 12.9 ppm
13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
at 21.40 ppm, 4 remaining signals are Ar...
thanks! For compound 18a the signal "e" is not 2H it is 3H, this was a...
thanks! For compound 18a the signal "e" is not 2H it is 3H, this
was a typo
18. Draw the structures of Compound 18a. and 18b. (18 pts), clearly indicate your assignments of all proton resonances (8 pts). Calculate the Unsaturation Index of each compound (4 pts) (30 points total) Unsat. Index = (2C+2-H-X +N)/2 = 3.0 2.00 25 490 2.0 e = 2.00 ppm. singlet, 2H d = 2.66 ppm, quartet, 2H f = 1.27 ppm, triplet, 3H 720...
(a) From the spectral data ( H, C NMR, IR, MS) you were given, identify the...
(a) From the spectral data ( H, C NMR, IR, MS) you were given,
identify the structure of your product. Explain why you chose your
particular product based on the spectroscopic data.
(b) Fully assign the 1H NMR spectrum of your product (i.e.
determine which peaks in the 1H NMR correspond to which hydrogens
in the product). You will not receive full marks for determination
of the unknown unless you assign the 1H NMR spectrum
completely.
(c) Now work backwards...
The above is just one question. please answer the following according to the above. 1. Assign...
The above is just one question. please answer the following
according to the above.
1. Assign signals of 13C and 1H spectra as well as find the
structural unit and functional group.
2. Give the structure
sample answer - as follows
1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
2.42 ppm, COOH proton at 12.9 ppm
13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
at 21.40 ppm, 4 remaining signals are Ar carbons,...
18. Draw the structures of Compound 18a. and 18b. (18 pts), clearly indicate your assignments of...
18. Draw the structures of Compound 18a. and 18b. (18 pts), clearly indicate your assignments of all proton resonances (8 pts). Calculate the Unsaturation Index of each compound (4 pts) (30 points total) 30 Unsat. Index = (2C+2-H-X+NY2 = 200 25 e = 2.00 ppm, 4.90 f = 1.27 ppm, 20 720 Compound 18a: C,H,O, singlet, 2H triplet, 3H 127 15 d = 2.66 ppm, a = 7.21 ppm, b = 7.18 ppm, doublet, 2H doublet, 2H C = 4.90...
Thanks! On each the following IR spectra, circle and indicate the most important stretching signal from...
Thanks!
On each the following IR spectra, circle and indicate the most important stretching signal from the following choices:N-H, O-H, CEN, CEO, C-O, Top, IR spectrum of Compound 18a: C14H1402 Bottom, IR Spectrum of Compound 18b: C3H120. write your answer on the corresponding square provided (2.5 pts each, 5 pts total) mar 2000 6 18. Draw the structures of Compound 18a. and 18b. (18 pts), clearly indicate your assignments of all proton resonances (8 pts). Calculate the Unsaturation Index of...
thanks!! There is a mistake on this, e on compound 18a is 3 hydrogens not 2!!!!...
thanks!! There is a mistake on this, e on compound 18a is 3
hydrogens not 2!!!! thanks again :)
On each the following IR spectra, circle and indicate the most important stretching signal from the following choices:N-H, O-H, CEN, CEO, C-O, Top, IR spectrum of Compound 18a: C14H1402 Bottom, IR Spectrum of Compound 18b: C3H120. write your answer on the corresponding square provided (2.5 pts each, 5 pts total) mar 2000 6 18. Draw the structures of Compound 18a. and...
Find the structure of C8H14O based on its IR and NMR data
4. Formula-CsHiO 1 1000 1580 2580 2808 2000 3se 4080 3H 3H 3H 2H 2H 1H pr gr 2.0 1.B 2.2 1,6 2.4 1.4 PP 5.4 5.2 5.0 4.8 4.6 4.4 4.2 PPM P1'1I LE 6ST L'BTLT
4. Formula-CsHiO 1 1000 1580 2580 2808 2000 3se 4080 3H 3H 3H 2H 2H 1H pr gr 2.0 1.B 2.2 1,6 2.4 1.4 PP 5.4 5.2 5.0 4.8 4.6 4.4...
Write down problem number.
Provide formula, HDI value, and a complete, chemically correct
structure for each problem.
Assign signals in the 1H and 13C spectra to specific atoms,
identify structural units and/or functional groups.
Example:
Problem # 3
Formula: C8H8O2
HDI: 5
1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
2.42 ppm, COOH proton at 12.9 ppm
13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
at 21.40 ppm, 4 remaining signals are Ar...
thanks! For compound 18a the signal "e" is not 2H it is 3H, this
was a typo
18. Draw the structures of Compound 18a. and 18b. (18 pts), clearly indicate your assignments of all proton resonances (8 pts). Calculate the Unsaturation Index of each compound (4 pts) (30 points total) Unsat. Index = (2C+2-H-X +N)/2 = 3.0 2.00 25 490 2.0 e = 2.00 ppm. singlet, 2H d = 2.66 ppm, quartet, 2H f = 1.27 ppm, triplet, 3H 720...
(a) From the spectral data ( H, C NMR, IR, MS) you were given,
identify the structure of your product. Explain why you chose your
particular product based on the spectroscopic data.
(b) Fully assign the 1H NMR spectrum of your product (i.e.
determine which peaks in the 1H NMR correspond to which hydrogens
in the product). You will not receive full marks for determination
of the unknown unless you assign the 1H NMR spectrum
completely.
(c) Now work backwards...
The above is just one question. please answer the following
according to the above.
1. Assign signals of 13C and 1H spectra as well as find the
structural unit and functional group.
2. Give the structure
sample answer - as follows
1H NMR: p-substituted Ar at 7.27-7.97 ppm, benzylic CH3 group at
2.42 ppm, COOH proton at 12.9 ppm
13C NMR: carbonyl C at 167.8 ppm (ester or acid), benzylic CH3
at 21.40 ppm, 4 remaining signals are Ar carbons,...
18. Draw the structures of Compound 18a. and 18b. (18 pts), clearly indicate your assignments of all proton resonances (8 pts). Calculate the Unsaturation Index of each compound (4 pts) (30 points total) 30 Unsat. Index = (2C+2-H-X+NY2 = 200 25 e = 2.00 ppm, 4.90 f = 1.27 ppm, 20 720 Compound 18a: C,H,O, singlet, 2H triplet, 3H 127 15 d = 2.66 ppm, a = 7.21 ppm, b = 7.18 ppm, doublet, 2H doublet, 2H C = 4.90...
Thanks!
On each the following IR spectra, circle and indicate the most important stretching signal from the following choices:N-H, O-H, CEN, CEO, C-O, Top, IR spectrum of Compound 18a: C14H1402 Bottom, IR Spectrum of Compound 18b: C3H120. write your answer on the corresponding square provided (2.5 pts each, 5 pts total) mar 2000 6 18. Draw the structures of Compound 18a. and 18b. (18 pts), clearly indicate your assignments of all proton resonances (8 pts). Calculate the Unsaturation Index of...
thanks!! There is a mistake on this, e on compound 18a is 3
hydrogens not 2!!!! thanks again :)
On each the following IR spectra, circle and indicate the most important stretching signal from the following choices:N-H, O-H, CEN, CEO, C-O, Top, IR spectrum of Compound 18a: C14H1402 Bottom, IR Spectrum of Compound 18b: C3H120. write your answer on the corresponding square provided (2.5 pts each, 5 pts total) mar 2000 6 18. Draw the structures of Compound 18a. and...
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