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Angular Distortions at Tetracoordinate Carbon Planoid Distortions in α,α′‐Bridged Spiro[4.4]nonanes and [5.5.5.5]Fenestranes
Author(s) -
Luef Wolfgang,
Keese Reinhart
Publication year - 1987
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19870700307
Subject(s) - chemistry , tetracoordinate , mndo , molecule , symmetry (geometry) , crystallography , deformation (meteorology) , bond length , stereochemistry , carbon fibers , computational chemistry , geometry , crystal structure , physics , organic chemistry , planar , computer graphics (images) , mathematics , meteorology , computer science , materials science , composite number , composite material
Structures of α,α′‐bridged spiro[4.4]nonanes and [5.5.5.5]fenestranes, obtained from X‐ray analysis and MNDO calculations, are investigated in terms of symmetry‐deformation coordinates. The central C(C) 4 fragments of these molecules show strong preference for compression, which is due to opening of opposite bond angles. The planoid deformations and strain energies of the fenestranes are discussed.