No abstract

Photolytisch aus Hexa‐tert‐butylcyclotrisilan erzeugtes Di‐tert‐butylsilylen reagiert mit Selenophen oder 2,5‐Dimethyltellurophen unter Chalkogenabstraktion zum 1,3‐Diselena‐2,4‐disiletan 6 und 1,3‐Ditellura‐2,4‐disiletan 7. Die Röntgenstrukturanalysen von 6 und 7 zeigen das Vorliegen planarer Vierringe mit den kleineren endocyclischen Winkeln an den Chalkogen‐ und den größeren an den Siliciumatomen.

Treatment of lead(II) bromide with phenylmagnesium bromide at low temperature furnishes yellow crystals of the ionic compound [BrMg(THF)5]+ [:Pb(PbPh3)3]- which, upon X-ray crystallographic analysis, reveals three stretched Pb-Pb bonds and Pb-Pb-Pb angles of about 93 degrees.

The amino dichlorophosphane (I) reacts with lithium bis(trimethylsilyl)amide (II) producing the intermediate (III).

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