Syntheses and structures of (R2Bi)2E (E = S, Te) and cyclo-(RSbSe)2[W(CO)5]2 [R = CH(SiMe3)2]

(R2Bi)(2)E [E = S (1), Te (2); R = CH(SiMe3)(2)] are formed by reaction of R2BiCl with Na2S or Na2Te. The reaction of cyclo (RSbSe)(n) [n = 2, 3; R = CH(SiMe3)(2)] with W(CO)(5)THF (THF = tetrahydrofuran) in THF results in trapping of the dimer in cyclo (RSbSe)(2)[W(CO)(5)](2) (3). The crystal structures of 1, 2, and 3 are reported. (C) 2002 Elsevier Science B.V. All rights reserved.