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Photochemistry of Aryl-Substituted Trigermanes. Generation and Mechanism of Formation of Germylenes.-In order to obtain informations on the reaction intermediates and primary photochemical processes, laser flash-photolysis at 293 K and matrix isolation studies of the phenylated trigermanes (I) and (II) are carried out. Trapping experiments with 2,3-dimethylbutadiene or CCl4 are studied and the rates of reactions are examined. It is discussed that photolysis of phenylated trigermanes involves both simple extrusion of germylenes and the formation of germyl radicals and digermyl radicals resulting from Ge-Ge bond homolysis. -(MOCHIDA, K.; YONEDA, I.; WAKASA, M.; J. Organomet. Chem. 399 (1990) 1-2, 53-62; Dep.

Photolysis of the trigermanes (I) in the presence of the butadiene (II) yields the germacyclopentenes (III) and the symmetrical digermanes (IV).