INTRAMOLECULAR [4+2] DIELS-ALDER CYCLOADDITIONS OF 2-SUBSTITUTED PHOSPHABENZENE AND ARSABENZENE IN TRIOSMIUM CLUSTERS

Abstract

2-(Trimethylsilyl)-1-phosphabenzene and -1-arsabenzene, Me(3)SiC(5)H(4)E (E = P, AS), react with [Os3H2(CO)(10)] to give the clusters [Os3H2(Me(3)SiC(5)H(4)E)(CO)(9)], which contain sigma-bonded, four-electron-donating mu 3-heterocyclic ligands, and the products [Os3H{(Me(3)Si)(2)C(10)H(9)E(2)}(CO)(9)], having tricyclic mu(3)-ligands derived from [4 + 2] Diels-Alder cycloadditions.