| Abstract: | Contributions to the Chemistry of Phosphorus. 129. Synthesis and Properties of the Phospha-germa-cyclobutanes (t-BuP)2(GePh2)2 and (t-BuP)3GePh2 The phospha-germa-cyclobutanes 1,2-di-tert-butyl-3,3,4,4-tetraphenyl-1,2-diphospha-3,4-digerma-cyclob utane, (t-BuP)2(GePh2)2 ( 1 ), and 1,2,3-tri-tert-butyl-4,4-diphenyl-1,2,3-tri-phospha-4-germa-cyclobutan e, (t-BuP)3GePh2 ( 2 ), are obtained as main-products of the cyclocondensation of K(t-Bu)P? P(t-Bu)K with Ph2GeCl2 under certain reaction conditions. 1 and 2 could be isolated in the pure state and were clearly characterized as the first four-membered P2Ge2 and P3Ge heterocycles, respectively. |
