ChemInform Abstract: Photochemistry of Aryl‐Substituted Trigermanes. Generation and Mechanism of Formation of Germylenes.

Abstract

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.

Substituent Effects

“…When these extended expressions are used for a sufficiently reliable set of data, it is sometimes found that one of the proportionality factors (ρ * , ρ, s, r) is negligibly small and the corresponding term can be omitted from the equation which then reduces to a type (7) relationship. Linear correlations of catalytic reactivity data against quantum chemical indices were introduced by Yoneda and coworkers [2,3,[24][25][26], who used the delocalizability of electrons in the transition state calculated by the MO-LCAO method according to Fukui [27]. Linear correlations of catalytic reactivity data against quantum chemical indices were introduced by Yoneda and coworkers [2,3,[24][25][26], who used the delocalizability of electrons in the transition state calculated by the MO-LCAO method according to Fukui [27].…”