1
13 1. Identify the following carbon and hydrogen atoms of the
following compound using the H, C,
1H-1H COSY, and 1H-13C HSQC spectra.
-
Mark the location of the following H’s on the H-NMR spectrum on the next page and also write their correct chemical shift in below.
-
Identify the carbons they are attached to and write the chemical shift of the appropriate C below.
c. Draw the following C-H coupling correlation on the attached HMQC spectrum on the next page.
i. C8-H8 ii. C10-H10 iii. C15-H15 iv. C16-H16
d. Calculate the following coupling constants. Show your work.
Homework Answers
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13 1. Identify the following carbon and hydrogen atoms of the
following compound using the...
Identify each compound in the following questions and make assignments in the 1H NMR a) First...
Identify each compound in the following questions and make
assignments in the 1H NMR
a) First spectra: Compound 1, 1H NMR given, and has a strong
absorbance in the IR at 1715 cm-1
b) Second spectra: Compound 2, a carboxylic acid of formula
C8H6O3Cl2 with 1H NMR given
c) Third spectra: Compound 3 with molecular formula of
C6H9ClO2, with 1H NMR given (the four signal from highest to lowest
chemical shift are quartet, quartet, double, and triplet)
d) Compound 4,...
3) What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C2H, NO and a...
3) What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C2H, NO and a characteristic IR stretch near 1700 cm?? Relative integration is shown. a) Explain the multiplicity and the chemical shift of each signal b) Indicate in each signal how you would calculate the coupling constants (). Give an approximate value (range) for each of the expected J values c) Indicate the 'H coupling showing the above-indicated J values ? PPM
Given the Cosey, HSQC and HMBC experiments assign the 1H NMR spectrum and 13C NMR spectrum...
Given the Cosey, HSQC and HMBC experiments assign the
1H NMR spectrum and 13C NMR spectrum signals
of the compound. 1H peaks are labelled using lowercase
letters and 13C peaks using uppercase. Be aware that the
letters of the same peak does not necessarily refer to the position
in the molecule. For example, peak a in the 1H and peak
A in the 13C NMR are not necessarily assigned to the
same number atom. The assignment of protons 4 and...
2) From the structures given below, select which one correspond to the following 'H-NMR spectrum? Relative...
2) From the structures given below, select which one correspond to the following 'H-NMR spectrum? Relative integration is shown. the coh a) Explain the multiplicity and the chemical shift of each signal bj Indicate in each signal how you would calculate the coupling constants. c) Indicate the 1H coupling showing the above-indicated J values ? 6 H2N PPM
A variety of spectra for an organic compound with molecular formula C10H16O are presented below. The experimental accurate mass using (+) APCI source is 153.1280 u. The 1H, 13C, COSY, HSQC and HMBC NM...
A variety of spectra for an organic compound with molecular
formula C10H16O are presented below. The
experimental accurate mass using (+) APCI source is 153.1280 u. The
1H, 13C, COSY, HSQC and HMBC NMR spectra are given in the following
slides. Propose a structure for this unknown and answer or address
the following questions or requirements:
a. Using the most abundant isotopes of C, H and O, what are the
errors in ppm and milli-Daltons for the experimental accurate
mass?...
A variety of spectra for an organic compound with molecular formula C10H16O are presented below. The experimental accurate mass using (+) APCI source is 153.1280 u. The 1H, 13C, COSY, HSQC and HMBC NM...
A variety of spectra for an organic compound with molecular
formula C10H16O are presented below. The
experimental accurate mass using (+) APCI source is 153.1280 u. The
1H, 13C, COSY, HSQC and HMBC NMR spectra are given in the following
slides. Propose a structure for this unknown and answer or address
the following questions or requirements:
d. If there are still any questionable assignments, propose
additional NMR experiments which would solve those questions and
briefly explain specifically what correlations you...
Answer ALL of the questions and show ALL of your work/ reasoning. 1. (16 points) Using...
Answer ALL of the questions and show ALL of your work/
reasoning.
1. (16 points) Using the COSY and HSQC spectra below assign all the protons and carbon resonances in 3- octanone recorded in C.D. solution at 298K at 600 MHz. Complete the table below to indicate which carbon is attached to which protons and at which position (#1-#8) using the numbering system provided. TH-TH COSY Spectrum 1000 MHZ. Benzene-Og solution Position # SH OC 0.82 0.92 1.11 1.19 1.47...
The H-NMR spectrum of an unknown compound (formula CaHgO2) is shown below. Draw the structure of...
The H-NMR spectrum of an unknown compound (formula CaHgO2) is shown below. Draw the structure of the unknown compound. Question 5 4 1 6 5 8 10 11 Ppm The 13C-NMR spectrum of an unknown compound (formula CgH180) is shown below. Its 1H-NMR spectrum only shows one singlet at 1.2 ppm. Draw the structure of this unknown compound. uestion 2 220 200 160 140 120 PPM 100 80 240 180 60 40 20 Create OscerSketch Answer 2 What would be...
for the following 2 compounds, please calculate, and show the calculations for, the degree of unsaturation, assign the IR spectrum peaks, assign the 13C NMR peaks, assign the 1H NMR peaks, and draw th...
for the following 2 compounds, please calculate, and
show the calculations for, the degree of unsaturation, assign the
IR spectrum peaks, assign the 13C NMR peaks, assign the 1H NMR
peaks, and draw the structure for the unknown compound.
CHIM 245 Spectroscopy Problem Set #2 In this problem set there are two unknown compounds. You are provided with the formula, IR spectrum, "C NMR spectrum, and 'H NMR spectrum for each compound. Each unknown is worth 10 points, with an...
Hi could you help me with this problem please? The following spectroscopic data were obtained for...
Hi could you help me with this problem please? The following spectroscopic data were obtained for an organic compound: i. MS (relative abundance in parentheses): M+ = 86 ; signals at 29 (92) and 41 (100) among others ii. IR (cm-1): 3100 (weak sharp), 2970 (medium sharp), 2850 (medium), 1650 (weak sharp), 1100 (strong sharp) iii. H1 NMR : Signal A at 4 ppm (3H, triplet), Signal B at 3.53 ppm (2H quartet), Signal C at 4.01...
Identify each compound in the following questions and make
assignments in the 1H NMR
a) First spectra: Compound 1, 1H NMR given, and has a strong
absorbance in the IR at 1715 cm-1
b) Second spectra: Compound 2, a carboxylic acid of formula
C8H6O3Cl2 with 1H NMR given
c) Third spectra: Compound 3 with molecular formula of
C6H9ClO2, with 1H NMR given (the four signal from highest to lowest
chemical shift are quartet, quartet, double, and triplet)
d) Compound 4,...
3) What is the structure of the compound in the following 1H-NMR spectrum with the molecular formula C2H, NO and a characteristic IR stretch near 1700 cm?? Relative integration is shown. a) Explain the multiplicity and the chemical shift of each signal b) Indicate in each signal how you would calculate the coupling constants (). Give an approximate value (range) for each of the expected J values c) Indicate the 'H coupling showing the above-indicated J values ? PPM
Given the Cosey, HSQC and HMBC experiments assign the
1H NMR spectrum and 13C NMR spectrum signals
of the compound. 1H peaks are labelled using lowercase
letters and 13C peaks using uppercase. Be aware that the
letters of the same peak does not necessarily refer to the position
in the molecule. For example, peak a in the 1H and peak
A in the 13C NMR are not necessarily assigned to the
same number atom. The assignment of protons 4 and...
2) From the structures given below, select which one correspond to the following 'H-NMR spectrum? Relative integration is shown. the coh a) Explain the multiplicity and the chemical shift of each signal bj Indicate in each signal how you would calculate the coupling constants. c) Indicate the 1H coupling showing the above-indicated J values ? 6 H2N PPM
A variety of spectra for an organic compound with molecular
formula C10H16O are presented below. The
experimental accurate mass using (+) APCI source is 153.1280 u. The
1H, 13C, COSY, HSQC and HMBC NMR spectra are given in the following
slides. Propose a structure for this unknown and answer or address
the following questions or requirements:
a. Using the most abundant isotopes of C, H and O, what are the
errors in ppm and milli-Daltons for the experimental accurate
mass?...
A variety of spectra for an organic compound with molecular
formula C10H16O are presented below. The
experimental accurate mass using (+) APCI source is 153.1280 u. The
1H, 13C, COSY, HSQC and HMBC NMR spectra are given in the following
slides. Propose a structure for this unknown and answer or address
the following questions or requirements:
d. If there are still any questionable assignments, propose
additional NMR experiments which would solve those questions and
briefly explain specifically what correlations you...
Answer ALL of the questions and show ALL of your work/
reasoning.
1. (16 points) Using the COSY and HSQC spectra below assign all the protons and carbon resonances in 3- octanone recorded in C.D. solution at 298K at 600 MHz. Complete the table below to indicate which carbon is attached to which protons and at which position (#1-#8) using the numbering system provided. TH-TH COSY Spectrum 1000 MHZ. Benzene-Og solution Position # SH OC 0.82 0.92 1.11 1.19 1.47...
The H-NMR spectrum of an unknown compound (formula CaHgO2) is shown below. Draw the structure of the unknown compound. Question 5 4 1 6 5 8 10 11 Ppm The 13C-NMR spectrum of an unknown compound (formula CgH180) is shown below. Its 1H-NMR spectrum only shows one singlet at 1.2 ppm. Draw the structure of this unknown compound. uestion 2 220 200 160 140 120 PPM 100 80 240 180 60 40 20 Create OscerSketch Answer 2 What would be...
for the following 2 compounds, please calculate, and
show the calculations for, the degree of unsaturation, assign the
IR spectrum peaks, assign the 13C NMR peaks, assign the 1H NMR
peaks, and draw the structure for the unknown compound.
CHIM 245 Spectroscopy Problem Set #2 In this problem set there are two unknown compounds. You are provided with the formula, IR spectrum, "C NMR spectrum, and 'H NMR spectrum for each compound. Each unknown is worth 10 points, with an...
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