Treatment of 1,2-dichlorodisilanes with di-Grignard reagents of 1,2-diethynyldisilanes leads to high yields of the eight-membered ring compounds (1a–c) which have u.v. absorptions near 250 nm indicative of σ–π conjugation.
T. Iwahara and R. West, J. Chem. Soc., Chem. Commun., 1988, 954 DOI: 10.1039/C39880000954
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