Acta Crystallographica Section C

Crystal Structure Communications

Volume 69, Part 4 (April 2013)


organic compounds



Acta Cryst. (2013). C69, 436-438    [ doi:10.1107/S0108270113005659 ]

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

W. Clegg, R. W. Harrington, L. G. Mercier and W. E. Piers

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)° between the C-C=C-C stern and the C-Si-C prow. The planes of the phenyl substituents are rotated by 32.23 (6) and 31.80 (7)° 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.

Formula: C28H24Si


cdxdisplay filedownload file

Chemdraw file (3.8 kbytes)
[ doi:10.1107/S0108270113005659/ky3030Isup3.cdx ]
Supplementary material


cmldisplay filedownload file

Chemical Markup Language (CML) file (7.9 kbytes)
[ doi:10.1107/S0108270113005659/ky3030Isup4.cml ]
Supplementary material


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