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13C chemical shift non-equivalence in methylene carbons of monosubstituted cyclohexanes

✍ Scribed by Hiroshi Ito; Alfred F. Renaldo; Robert D. Johnson; Mitsuru Ueda

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
361 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

Monosubstituted cyclohexanes were synthesized by addition of a cyclohexyl radical to olefins bearing different substituents at the a-position. Six distinct methylene "C resonances were observed, indicating that the methylene carbons located at the 2 and 6 positions and at the 3 and 5 positions are not magnetically equivalent. This magnetic non-equivalence (anisochronism) observed in the monosubstituted cyclohexanes is due to the introduction of an asymmetric center fl to the prochiral C-1 ring carbon.

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