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Ring Closure and Ring Expansion Reactions in Bridged Triarylphosphanes and Triarylarsanes with o ‐Isopropenyl Substituents. Novel Candidates for Turnstile Geometry
Author(s) -
Hellwinkel Dieter,
Wiel Andreas,
Sattler Gerhard,
Nuber Bernd
Publication year - 1990
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199006891
Subject(s) - ring (chemistry) , trigonal bipyramidal molecular geometry , chemistry , turnstile , closure (psychology) , geometry , crystallography , stereochemistry , ideal (ethics) , mathematics , crystal structure , computer science , market economy , philosophy , organic chemistry , economics , epistemology , programming language
ortho ‐Cyclizations to C 3r polycycles 1 and novel ring expansions by three ring members takes place on acid treatment of the 2,6‐diisopropenylphenyl derivatives 2 . The pentacoordinated o ‐chloranil adduct of 1 (Y = P) does not exhibit ideal turnstile geometry, but a distorted trigonal‐bipyramidal structure.