Abstract
The perflouroalkynyl derivatives of germanium and tin (CH 3) n M(C CR f) 4- n (MGe, Sn; R f CF 3, CF 2CF 3, CF(CF 3) 2; n3, 2; but not all combinations) react with trimethyl-trifluoromethyltin at 150° to give the cyclopropenyl derivatives (CH 3) n M( CC(R f)C F 2) 4- n . The reaction probably involves the addition fo difluorocarbene to the carbon-carbon triple bond, and the carbene is probably produced in the singlet state by thermolysis of the tin compound, since it adds stereospecifically to the double bond of cis- and trans-butane-2. The carbene also adds to the double bond of trimethylvinylsilane, but not to the double bond of the cyclopropenyl derivatives. Spectroscopic properties of the new compounds are discussed.
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