H. Ohgaki et al., REACTION OF A GERMYLENE WITH ETHYLENE - A STABLE DIGERMACYCLOBUTANE VIA A GERMIRANE INTERMEDIATE, Organometallics, 14(5), 1995, pp. 2139-2141
1,2-Digermacyclobutane (2) is formed by reaction of a stable germylene
(1) with ethylene. The crystal structure of 2 has been, determined by
single-crystal X-ray diffraction. The H-1 NMR spectrum of the reactio
n, mixture revealed the presence of a germirane having no substituents
on the ring carbon.