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Propeller rotation of aryl groups in triarylsilanes and triarylstannanes
Author(s) -
Lambert Joseph B.,
Lin Lijun
Publication year - 2001
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.925
Subject(s) - chemistry , steric effects , aryl , substituent , rotation (mathematics) , propeller , tin , stereochemistry , crystallography , silicon , medicinal chemistry , computational chemistry , alkyl , organic chemistry , geometry , mathematics , marine engineering , engineering
Rotation of aryl groups was studied in eight systems with the general structure Ar 3 MX by changes in lineshapes as a function of temperature. Steric constraints were varied at each of the structural components (Ar, M, X). The barrier to rotation decreased as the central atom was changed from carbon to silicon to tin. When the substituent X was large (allyl or Cl), buttressing by the meta methyls in duryl raised the barrier. For X = H, however, buttressing decreased the barrier. Copyright © 2001 John Wiley & Sons, Ltd.