The following questions concern experimental parameters for obtaining 13C spectra and how to explain unexpected results. The first spectrum is a standard broadband decoupled spectrum of camphor?
B reason for the difference between the spectra? In this case, the spectrum was again obtained with only one parameter changed from the reference spectrum. What is the 70 60 50 40 20 10 ppm
Homework Answers
The parameter - 1H irradiation during D1 to buildup NOE was not applied in the second case hence splitting was observed. In this parameter, 1H are irradiated hence no coupling between 1H and 13C is seen and hence splittings are observed,
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The following questions concern experimental parameters for obtaining 13C spectra and how to expl...
The following questions concern experimental parameters for obtaining 13C spectra and how to expl...
The following questions concern experimental parameters for
obtaining 13C spectra and how to explain unexpected results. The
first spectrum is a standard broadband decoupled spectrum of
camphor
Collection parameters 45o tip angle, D16 s Low power broadband 1H irradiation during D1 to buildup NOE (30 dB below 20 W), and high power during AT to fully decouple protons (5 dB below 20 W) 60 50 40 30 20 10 ppm 70 A deterioration in signal-to-noise ratio and loss of some...
Answer the following questions about the provided spectra: The Molecular Weight of the compound is 88...
Answer the following questions about the provided spectra: The Molecular Weight of the compound is 88 g/mol. A) (1 point) The broad peak at -3100 cm and the strong peak at 1700 cm' combined indicate the presence of what functional group? B) (1 point) How many hydrogen neighbors does the septet at 2.6 ppm in the 'H NMR spectrum have? C) (1 point) What functional group is indicated by the peak at 184 ppm in the C spectrum? D) (1...
Please answer questions 2,3, and 4 that correspond to the nmr spectra of (2E,6E)-2,6-dibenzylidenecyclohexanone. Product: ppm...
Please answer questions 2,3, and 4 that correspond to the nmr
spectra of (2E,6E)-2,6-dibenzylidenecyclohexanone.
Product:
ppm BE 06 135 94 190 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 ppm 30 20 2. Are there any non-aromatic or non-alkene protons seen on the 'H NMR spectrum (yes or no)? If so, list the corresponding ppm value(s): 3. Are there any peaks upfield of 70 ppm seen in the 13C NMR spectrum (yes or...
Need help drawing the skeletal structure of the unknown compound Information: Each spectra below was obtained...
Need help drawing the skeletal structure of the unknown compound
Information: Each spectra below was obtained from a pure compound. Mass Spectrum parent peaks (M) are listed for all examples. IR peaks listed are strong (s) unless otherwise indicated for signals above 1500 cm HNMR Spectra, the integral is given in number of hydrogens (#H) or as a relative ratio. Important coupling constants (values) are listed next to the peaks for some examples. For some spectra, an inset (grey box)...
Deduce the following structure of the compound given their IR, H1 NMR, 13C NMR spectra, and...
Deduce the following structure of the compound given their IR, H1
NMR, 13C NMR spectra, and assign IR functional group absorptions
and assign the structure's protons and carbons to their respective
spectral resonances.
Compound 6 1756 IR Spectrum uid Sm) 15820 4000 3000 2000 1600 1200 800 V (cm) 100 55 Mass Spectrum 71 80 70 60 No significant UV M158 (1%) absorption above 220 nm C&H140s 40 80 120 160 200 240 280 m/e 13C NMR Spectrum (50.0 MHz,...
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?...
Analzye the following spectra, and propose a structure for each. The bottom set of 3 spectra are ...
Analzye the following spectra, and propose a structure for each.
The bottom set of 3 spectra are DEPT spectra, top: CH only, middle:
CH, CH3 up, CH2 down, bottom: normal BB decoupled spectrum. Explain
your assignments . Analyze means determine integrals, draw
splitting trees, determine carbon type (C, vs CH vs CH2 vs CH3 and
structural environment. Use ChemDraw to check your proposed
structure (include output),
Problem C 7.5 7.0 .5 6.05.55.0 4.5 4.03.5 3.0 2.5 ppm 31 ppm 140...
spectral problem its all one problem 1) identify the compounds for each group of spectra (mass,...
spectral problem its all one problem
1) identify the compounds for each group of spectra (mass,
proton, carbon and IR)
2) assign the proton and carbon and IR spectra. identify at
least two possible fragmentation on the mass spectrum
the
values is whats there from the 3rd graph thats all i was
given
#8 1H 5.5 5.0 20 ag 200 180 160 140 120 100 80 0 40 20 C-69.8: H-11.6 -18.6 100 - MS-W-11 80 60 40- 20- 10...
8. (10 points) The following spectra correspond to compounds AE listed below con pound to its...
8. (10 points) The following spectra correspond to compounds AE listed below con pound to its corresponding spestre Label very simal on the spectrum (as Co . ctc.). Spectrum CDCI, 190 160 170 160 150 140 130 120 110 100 80 80 Spectrum 2 70 80 50 40 30 20 10 O le CDCI, 190 180 170 180 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 O de CDCI, 190 180 170 180...
4. Each of the following 7 structures corresponds to one of the 13C NMR spectra below....
4. Each of the following 7 structures corresponds to one of the 13C NMR spectra below. Re-draw each structure next to the appropriate spectrum and use letter codes to designate the chemically equivalent carbons. Label each peak on the spectrum with the appropriate letter code. ů o gani STRUCTURE: 66 5 ' 4OPPM 30 STRUCTURE: group group 140 120 100 80 PPM 66 4 0 20 STRUCTURE: 100 B0 60 46 PPM NAME: SSID: STRUCTURE: group 605646 30 2016 group...
The following questions concern experimental parameters for
obtaining 13C spectra and how to explain unexpected results. The
first spectrum is a standard broadband decoupled spectrum of
camphor
Collection parameters 45o tip angle, D16 s Low power broadband 1H irradiation during D1 to buildup NOE (30 dB below 20 W), and high power during AT to fully decouple protons (5 dB below 20 W) 60 50 40 30 20 10 ppm 70 A deterioration in signal-to-noise ratio and loss of some...
Answer the following questions about the provided spectra: The Molecular Weight of the compound is 88 g/mol. A) (1 point) The broad peak at -3100 cm and the strong peak at 1700 cm' combined indicate the presence of what functional group? B) (1 point) How many hydrogen neighbors does the septet at 2.6 ppm in the 'H NMR spectrum have? C) (1 point) What functional group is indicated by the peak at 184 ppm in the C spectrum? D) (1...
Please answer questions 2,3, and 4 that correspond to the nmr
spectra of (2E,6E)-2,6-dibenzylidenecyclohexanone.
Product:
ppm BE 06 135 94 190 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 ppm 30 20 2. Are there any non-aromatic or non-alkene protons seen on the 'H NMR spectrum (yes or no)? If so, list the corresponding ppm value(s): 3. Are there any peaks upfield of 70 ppm seen in the 13C NMR spectrum (yes or...
Need help drawing the skeletal structure of the unknown compound
Information: Each spectra below was obtained from a pure compound. Mass Spectrum parent peaks (M) are listed for all examples. IR peaks listed are strong (s) unless otherwise indicated for signals above 1500 cm HNMR Spectra, the integral is given in number of hydrogens (#H) or as a relative ratio. Important coupling constants (values) are listed next to the peaks for some examples. For some spectra, an inset (grey box)...
Deduce the following structure of the compound given their IR, H1
NMR, 13C NMR spectra, and assign IR functional group absorptions
and assign the structure's protons and carbons to their respective
spectral resonances.
Compound 6 1756 IR Spectrum uid Sm) 15820 4000 3000 2000 1600 1200 800 V (cm) 100 55 Mass Spectrum 71 80 70 60 No significant UV M158 (1%) absorption above 220 nm C&H140s 40 80 120 160 200 240 280 m/e 13C NMR Spectrum (50.0 MHz,...
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?...
Analzye the following spectra, and propose a structure for each.
The bottom set of 3 spectra are DEPT spectra, top: CH only, middle:
CH, CH3 up, CH2 down, bottom: normal BB decoupled spectrum. Explain
your assignments . Analyze means determine integrals, draw
splitting trees, determine carbon type (C, vs CH vs CH2 vs CH3 and
structural environment. Use ChemDraw to check your proposed
structure (include output),
Problem C 7.5 7.0 .5 6.05.55.0 4.5 4.03.5 3.0 2.5 ppm 31 ppm 140...
spectral problem its all one problem
1) identify the compounds for each group of spectra (mass,
proton, carbon and IR)
2) assign the proton and carbon and IR spectra. identify at
least two possible fragmentation on the mass spectrum
the
values is whats there from the 3rd graph thats all i was
given
#8 1H 5.5 5.0 20 ag 200 180 160 140 120 100 80 0 40 20 C-69.8: H-11.6 -18.6 100 - MS-W-11 80 60 40- 20- 10...
8. (10 points) The following spectra correspond to compounds AE listed below con pound to its corresponding spestre Label very simal on the spectrum (as Co . ctc.). Spectrum CDCI, 190 160 170 160 150 140 130 120 110 100 80 80 Spectrum 2 70 80 50 40 30 20 10 O le CDCI, 190 180 170 180 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 O de CDCI, 190 180 170 180...
4. Each of the following 7 structures corresponds to one of the 13C NMR spectra below. Re-draw each structure next to the appropriate spectrum and use letter codes to designate the chemically equivalent carbons. Label each peak on the spectrum with the appropriate letter code. ů o gani STRUCTURE: 66 5 ' 4OPPM 30 STRUCTURE: group group 140 120 100 80 PPM 66 4 0 20 STRUCTURE: 100 B0 60 46 PPM NAME: SSID: STRUCTURE: group 605646 30 2016 group...
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