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Synthesis, Structure, and Isomerization of the ( E )‐ and ( Z )‐Isomers of a Diphosphene
Author(s) -
Niecke Edgar,
Altmeyer Oliver,
Nieger Martin
Publication year - 1991
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.199111361
Subject(s) - isomerization , substituent , halogen , chemistry , aryl , stereochemistry , medicinal chemistry , catalysis , organic chemistry , alkyl
The halogen substituent of the diphosphanes 1 a, b decides whether the ( E )‐ or the ( Z )‐diphosphene 2a or 2b respectively is formed upon halosilane elimination. For the first time, therefore, it was possible to carry out the directed synthesis of both isomers of a diphosphene. These interconvert in solution, the activation barrier for the ( E / Z )‐isomerization at 293 K being 25.4 kcal mol −1 . Aryl = 2,4,6‐ t Bu 3 C 6 H 2 .