H. Lavayssiere

Dioxa- et dithiagermoles: synthese et quelques aspects de leur reactivite

Abstract Synthetic methods to obtain new dioxagermoles and dithiagermoles are described. Dioxagermoles decompose to germylenes and α-diketone on thermolysis, and formation of cyclotrigermathianes (R 2 GeS) 3 from dithiagermoles is observed at about 200°C via a R 2 GeS intermediate. Exchange reactions between dioxagermoles or dithiagermoles and thiophosgene give a dioxolethione and a dithiolethione, respectively. In the exchange reaction between dithia- and dioxa-germoles with GeCl 2 ·dioxane, formation of new stable unsaturated germylenes is observed.

Synthesis ofo-thiatelluraphenylenezirconocenes. X-ray crystal structure of Open image in new window

Summaryo-Thiatelluraphenylenezirconocene complexes were obtained in good yield by reaction of dilithiumo-benzenthiatelluride with zirconocene dichlorides. These compounds represent the first examples of heterodichalcogenaphenylene bent metallocences. They were characterized by spectroscopic methods and the effect on the n.m.r. results of stepwise substitution of one and two Te atoms for S is discussed.X-ray crystal structure analysis was performed for one representative complex. The structure is very similar to that previously reported for a diselenaphenylene complex, but the disorder observed for chalcogen atoms prevents an accurate comparison of the geometrical parameters with other related compounds.