PH(3)P=SE AS A CONVENIENT SYNTHON FOR ONE-STEP SYNTHESES OF PH(3)P-SUBSTITUTED SELENIDO CARBONYL IRON AND RUTHENIUM CLUSTERS - CRYSTAL STRUCTURES OF FE-3(MU(3)-SE)(2)(MU-CO)(CO)(7)(PPH2), M(3)(MU(3)-SE)(2)(CO)(7)(PPH(3))(2)(M=FE OR RU) AND RU(4)(MU(4

摘要

Ph(3)P=Se reacts in toluene with Fe-3(CO)(12) or Ru-3(CO)(12) affording a variety of Ph(3)P-substituted selenido carbonyl clusters. In the case of iron the reaction is unselective, six products (1-6) having been obtained belonging to three different families of clusters. Fe-2(mu-Se-2)(CO)(6-n)L(n) (two products, 3, 5, n=1, 2), Fe-3(mu(3)-Se)(2)(CO)(9-n)L(n) (three products, 1, 2, 4, n=0-2) and Fe-3(mu(3)-Se)(mu-CO)(CO)(9-n)L(n) (one product, 6, n=2). In the case of ruthenium, under certain conditions, the reaction is quite selective giving the disubstituted trinuclear cluster RU(3)(mu(3)-Se)(2)(CO)(7)(PPh(3))(2) (8) in very high yield (>90%). Minor products are the mono- and trisubstituted analogous derivatives 7 and 10 and the tetraruthenium cluster Ru-4(mu(4)-Se)(2)(mu-CO)(2)(CO)(7)(PPh(3))(2) (9). The crystal structures of the clusters 4, 6, 8 and 9 are described. [References: 27]