Der beim phenyl-substituierten Analogen beobachtete Solvatochromieeffekt [2a] ist offenbar durch die Phenylreste bedingt. ErwartungsgemaR wird (I) schon in Medien geringer Protonenaktivitat zu (4) protoniert. Mit Tetracyanathylen gibt (1) einen aus CH2Clz in blau-schwarzen Nadeln kristallisierenden x-Komplex [Ama, = 795 rnp (CH2C12); 780 m p
Above 190°C, traces of the two symmetrical distannanes begin to appear, but so do tetraethyltin and tetramethyltin. In addition, some elemental tin is deposited, hence the reaction at 190°C is not a well defined disproportionation but a drastic decomposition. Analogously, the two symmetrical distannanes can be mixed and heated without formation of unsymmetrical distannane in more than trace amounts. Received: May 2lst, 1965 [ Z 990/816 IE] German version: Angew. Chern. 77, 622 (1965)[I] Review: W. P. Neumann, Angew. Chem. 76, 849 (1964).
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