Chapter 13: Q13-39E (page 419)
Predict the splitting pattern for each kind of hydrogen in isopropyl propanoate,.
Short Answer
Peaks produced are:
One singlet
Two quartet
Three septate
Four doublet
Chapter 13: Q13-39E (page 419)
Predict the splitting pattern for each kind of hydrogen in isopropyl propanoate,.
Peaks produced are:
One singlet
Two quartet
Three septate
Four doublet
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Get started for freeQuestion: The NMR spectra of compound A, , are shown. Propose a structure for A, and assign peaks in the spectra to your structure.
Question: When measured on a spectrometer operating at 200 MHz, chloroform shows a single sharp absorption at 7.3.
(a)How many parts per million downfield from TMS does chloroform absorb?
(b)How many hertz downfield from TMS would chloroform absorb if the measurement were carried out on a spectrometer operating at 360 MHz?
(c)What would be the position of the chloroform absorption inunits when measured on a 360 MHz spectrometer?
Question: 3-Bromo-1-phenyl-1-propene shows a complex NMR spectrum in which the vinylic proton at C2 is coupled with both the C1 vinylic proton (J = 16 Hz) and the C3 methylene protons (J = 8 Hz). Draw a tree diagram for the C2 proton signal, and account for the fact that a five-line multiplet is observed .
Long-range coupling between protons more than two carbon atoms apart is sometimes observed when p bonds intervene. An example is found in 1-methoxy-1-buten-3-yne. Not only does the acetylenic proton, , couple with the vinylic proton , it also couples with the vinylic proton , four carbon atoms away. The data are:
Construct tree diagrams that account for the observed splitting patterns of ,, and .
How many absorptions would you expect to observe in the NMR
spectra of the following compounds?
(a) 1,1-Dimethylcyclohexane
(b) CH3CH2OCH3
(c) tert-Butylcyclohexane
(d) 3-Methyl-1-pentyne
(e) cis-1,2-Dimethylcyclohexane
(f) Cyclohexanone
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