Synthesis and structures of polychalcogenadistannabicyclo[k.l.m]alkanes

Intramolecularly Coordinated Tin(II) Selenide and Triseleneoxostannonic Acid Anhydride

“…This value is somewhat larger than those found for SnÀSe single bonds (range 1000-1300 Hz) [31] but rather smaller than those found for Sn=Se double bonds in diorganotin(IV) selenides (range 3000-3300 Hz). [36] The value of 1 J( 119 Sn, 77 Se) was thus assigned to the Sn À Se bridging bond, and the increase of the value agrees well with the partial shortening of this bond in solution. The UV/Vis spectrum of 3 in toluene showed the absorption at 361 nm, which was assigned to the n!p* transition and indicated the partial double-bond character of the terminal SnÀSe bonds in 3.…”

“…[35] The synthesis of polychalogenadimetallabicyclo-A C H T U N G T R E N N U N G [k.l.m]alkanes has been reported as well. [36] All compounds reported so far, however, contain chalogenides in the bridging positions containing an EÀX single bond.…”

Reactivity of 1,2,3-triselena[3]ferrocenophane towards transition metal carbonyls

“…Examples where only two of the four core atoms of the basic square core units are involved in cluster formation are very limited. Bicyclic cage like structures, similar to 1 have been observed in a SneSe system in tetraselenadistannabicyclo [2,1,1] hexane [48] and two MneS systems, [Mn 2 (CO) 6 (m-h 4 -SC 6 When a hexane solution of 1,2,3-triselena [3]ferrocenophane was photolysed with iron pentacarbonyl under inert atmosphere, formation of a new ferrocene-bridged Fe 2 Se 2 cluster, [Fe(h-C 5 H 4 Se) 2 Fe 2 (CO) 6 ] (2) was observed (Scheme 3). The compound was found to be stable in solid state but decomposes slowly in solution.…”

Synthesis and reactions of a novel bulky aryllithium

“…2 51,52 In order to confirm the formation of chlorostannylene Bbsp(Cl)Sn:, the resulting mixture was treated with carbon tetrachloride because stannylenes were reported to react with carbon tetrachloride to give the corresponding dichloro derivatives. 53,54 After column chromatography of the reaction mixture, 6 was unexpectedly obtained in 32% yield and trichlorostannane BbspSnCl 3 was not obtained (Scheme 2). The structure of 6 was established by X-ray crystallographic analysis (Fig.…”