Neue metastabile Germanium‐Modifikationen allo‐Ge und 4H‐Ge aus Li7Ge12

Photochemical reaction of some aromatic thiones 2 with bis(tert-butylthio)ethyne 1 affords the α,β-unsaturated dithio esters 4 via a (2 + 2)-cycloaddition reaction of the triplet-excited thiones 2 with acetylene 1. In one case, a (2 + 2)-cycloadduct, thiete 3o, was isolated. Spectroscopic investigations revealed that in solution there is an equilibrium between this thiete 3o and the isomeric α,β-unsaturated dithio ester 4o. The generality of this equilibrium phenomenom is examined and discussed with respect to the substituents of the C=C-C=S moiety of the α,β-unsaturated dithio esters 4.

Photochemical reactions of some aromatic thiones with bis(tert‐butylthio)ethyne. Isolation and properties of thietes, the photochemical (2 + 2)‐cycloadducts and their isomeric α,β‐unsaturated dithioesters

A. M. de Vos

Papers

Structure of xanthene-9-spiro-2'-[3',4'-bis(tert-butylthio)thiete]