Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
ChapterL3: Carbon (13c) Nmr Spectroscopy
Section: Chapter Questions
Problem 6CTQ
Related questions
Question
True or false
Please answer c,d,e
![a. A proton with a chemical shift of 600HZ relative to TMS in a 600MHZ NMR appears
at 0.5 ppm in a 300 MHz NMR.
b. The coupling constant J3 in 1-bromo-2-chloroethane which is 6.0 Hz in a 200 MHz
NMR is 12.0 Hz in a 400 MHz NMR.
c. 1,1-dimethylcyclohexane at temperatures that prevent conformational interconversion
exhibits 6 chemical shifts in the proton NMR spectrum.
d. "CNMR spectra cannot normally be integrated without the use of a specialized NMR
technique because of long relaxation times.
e. Protons that are downfield are shielded
f. 1-Chlorocyclohexane has diastereotopic hydrogens
g. Non-first order effects in proton NMR spectra are more important as the chemical
shift difference between two protons gets larger than their coupling interaction,](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7b5c5b72-33dc-4aa7-8c6b-d3aa2067f4ef%2F90d45137-6f63-4a4d-a6b8-6a95bb3d04d7%2Fd0us1xu_processed.jpeg&w=3840&q=75)
Transcribed Image Text:a. A proton with a chemical shift of 600HZ relative to TMS in a 600MHZ NMR appears
at 0.5 ppm in a 300 MHz NMR.
b. The coupling constant J3 in 1-bromo-2-chloroethane which is 6.0 Hz in a 200 MHz
NMR is 12.0 Hz in a 400 MHz NMR.
c. 1,1-dimethylcyclohexane at temperatures that prevent conformational interconversion
exhibits 6 chemical shifts in the proton NMR spectrum.
d. "CNMR spectra cannot normally be integrated without the use of a specialized NMR
technique because of long relaxation times.
e. Protons that are downfield are shielded
f. 1-Chlorocyclohexane has diastereotopic hydrogens
g. Non-first order effects in proton NMR spectra are more important as the chemical
shift difference between two protons gets larger than their coupling interaction,
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