Synthesis of the first germa-1-pyrazoline and its decomposition via a germirane intermediate

Article abstract of DOI:10.1016/0022-328X(89)85096-X

The first germapyrazoline, 4-germa-1-pyrazoline (2), has been obtained by <2+3> cycloaddition of diazomethane to the Ge=C bond of the germene (1).Thermal or photochemical decomposition of 2 via a germirane intermediate (4) gives 9-methyl-enefluorene and dimesitylgermylene, which can be trapped by 2,3-dimethylbutadiene.