Below is a zoomed in portion of a 13C{'H} NMR spectrum of the quaternary carbons of Compound 1. The downfield signal is a 14-line pattern, while the upfield signal is a 7- line pattern. Identify which carbon atom corresponds to what signal and explain the splitting. Also, why is the largest coupling constant (J) for the 14-line pattern larger by about 4 Hz than the analogous coupling constant in the 7-line pattern? CF3 CF3 F3C

Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
ChapterL3: Carbon (13c) Nmr Spectroscopy
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Below is a zoomed in portion of a 13C{'H} NMR spectrum of the gquaternary carbons of
Compound 1. The downfield signal is a 14-line pattern, while the upfield signal is a 7-
line pattern. Identify which carbon atom corresponds to what signal and explain the
splitting. Also, why is the largest coupling constant (J) for the 14-line pattern larger by
about 4 Hz than the analogous coupling constant in the 7-line pattern?
"CF3
CF3
Transcribed Image Text:Below is a zoomed in portion of a 13C{'H} NMR spectrum of the gquaternary carbons of Compound 1. The downfield signal is a 14-line pattern, while the upfield signal is a 7- line pattern. Identify which carbon atom corresponds to what signal and explain the splitting. Also, why is the largest coupling constant (J) for the 14-line pattern larger by about 4 Hz than the analogous coupling constant in the 7-line pattern? "CF3 CF3
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