Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
On the Isomerization of Dimers of Perchloro-(3,4-dimethylenecyclobutene) as Revealed by X-ray Methods
Akio Furusaki
Author information
JOURNALS FREE ACCESS

1968 Volume 41 Issue 12 Pages 2886-2894

Details
Abstract

The isomerization of several dimers of perchloro-(3,4-dimethylenecyclobutene) (I) has recently been reported by Fujino et al. Of these dimers, one (II) is transformed to other isomers (IIIa) and (IIIb) by means of pyrolysis at ca. 200°C. When heated to ca. 250°C, IIIa and IIIb are further converted into a fourth isomer (IV). The present X-ray study has revealed that II corresponds to perchloro-(3,4,7,8-tetramethylene-tricyclo[4.2.0.02.5]octane), as supposed from the chemical evidence, and IV, to perchloro-(4,8-dimethylene-tricyclo[3.3.2.01.5]deca-2,6-diene). It has been further established, from the results of the X-ray analysis of the dichloride of IIIa with the help of the chemical information, that IIIa and IIIb have the same two-dimensional chemical structure, perchloro-(3,4,7,8-tetramethylene-cycloocta-1,5-diene), rather than perchloro-(2,3,7,8-tetramethylene-bicyclo[4.2.0]octa-4-ene) which was speculated by Fujino et al., and that IIIa and IIIb are different from each other in the conformation of the cyclooctadiene ring. These structures for II, IIIa, IIIb, and IV give a reasonable explanation of the mechanism of the successive isomerization reactions mentioned above.

Information related to the author

This article cannot obtain the latest cited-by information.

© The Chemical Society of Japan
Previous article Next article
feedback
Top