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SiGe 2 and Ge 3 : Cyclic Digermenes that Undergo Unexpected Ring‐Expansion Reactions
Author(s) -
Lee Vladimir Ya.,
Yasuda Hiroyuki,
Ichinohe Masaaki,
Sekiguchi Akira
Publication year - 2005
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200501885
Subject(s) - ring (chemistry) , bent molecular geometry , isosceles triangle , crystallography , cyclopropene , chemistry , crystal structure , germanium , stereochemistry , silicon , geometry , mathematics , medicinal chemistry , organic chemistry
The heavy cyclopropene analogues 1 H ‐siladigermirene R 4 SiGe 2 ( 1 a ) and 1 H ‐trigermirene R 4 Ge 3 ( 1 b ) have been obtained, and the X‐ray crystal structure of 1 a shows that it forms an isosceles triangle with a highly trans ‐bent endocyclic GeGe bond (bending angle 51.0(2)°). The interaction of 1 a and 1 b with CH 2 Cl 2 unexpectedly affords the unusual four‐membered‐ring compounds 2 a and 2 b as a result of ring expansion (see scheme: E=Si, Ge; R=SiMe t Bu 2 ).