A new route to strained cyclic disilanylene–acetylenes(1,2,5,6-tetrasilacyclo-octa-3,7-diyne)
Abstract
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.