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Methyl Group in Isocopalane Derivative Showed an Unusual Negative 1 H NMR Chemical Shift
Author(s) -
Xiao Xiong,
Chen Tianqi,
Zhang Fengfeng,
Cheng Jiagao,
Wu Peiying,
Ren Jiangmeng,
Zeng Bubing
Publication year - 2015
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201500187
Subject(s) - chemistry , group (periodic table) , hydrazide , chemical shift , derivative (finance) , carbon 13 nmr , stereochemistry , crystallography , organic chemistry , financial economics , economics
An unusual negative 1 H NMR chemical shif of methyl group was discovered in condensation product of isocopalane diterpenoid with p ‐toluenesulfonyl hydrazide. 2D NMR, computational studies and single‐crystal X‐ray diffraction analysis showed that the C‐20 methyl group was shielded.