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

(R2Bi)2E [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)5THF (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.