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5,5-Dimethyl-2,8-diphenyl-5H-dibenzo[b,f]silepine: a synchrotron study

Lookup NU author(s): Emeritus Professor Bill CleggORCiD, Dr Ross Harrington

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Abstract

The molecule of the title silepine compound, C28H24Si, lies on a crystallographic general position but has almost exact mirror symmetry. The seven-membered silepine ring has a boat conformation, with a fold angle of 99.99(9)degrees between the CC=CC stern and the CSiC prow. The planes of the phenyl substituents are rotated by 32.23(6) and 31.80(7)degrees out of the planes of the respective fused benzene rings. Similar folded conformations are found for other dibenzo[b,f]silepines, while analogous dibenzo[b,f]borepines, in which the B atom can participate in conjugation, have a more flattened heterocyclic ring.

Publication metadata

Author(s): Clegg W, Harrington RW, Mercier LG, Piers WE

Publication type: Article

Publication status: Published

Journal: Acta Crystallographica Section C; Crystal Structure Communications

Year: 2013

Volume: 69

Issue: 4

Pages: 436-438 [plus 6 pages supplementary materials]

Print publication date: 01/04/2013

ISSN (print): 0108-2701

ISSN (electronic): 2053-2296

Publisher: Wiley-Blackwell Publishing, Inc.

URL: http://dx.doi.org/10.1107/S0108270113005659

DOI: 10.1107/S0108270113005659

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