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Structures of Two Cyclotetrasiloxanes with Intra and Intercyclic –CH 2 CH 2 ‐Bridges
Author(s) -
Ovchinnikov Yu. E.,
Shklover V. E.,
Struchkov Yu. T.,
Astapova T. V.,
Zhdanov A. A.
Publication year - 1986
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19865330219
Subject(s) - bridge (graph theory) , saddle , ethylene , polymer , strain (injury) , crystallography , materials science , structural engineering , stereochemistry , chemistry , engineering , composite material , biology , organic chemistry , anatomy , catalysis
Molecular structures of two cyclotetrasiloxanes with intra and intercyclic ethylene bridges were determined by an X‐ray structure analysis. The presence of the intracyclic bridge results in a saddle conformation, unusual for tetrasiloxane cycles, and in a significant strain of the cycle. The tetrasiloxane cycles linked by this bridge have a highly symmetric chair conformation which is likely to persist in the corresponding polymer.