Disilathiane, hexamethyl

SPCjH, Phosphine sulfide, dimethyl-, and manganese complex, 26 162 SPOjC 4H2o. 2H-l,2-Thiaphosphorin-2-ium, 3,4,5,6-tetrakis(methoxycarbonyl)-2,2-dimethyl-, manganese complex, 26 165 SSi2C6H3o, Disilathiane, hexamethyl-, 29 30 S2, Disulfido, chromium complex, 29 252 S2BOP3RhC ,Hs Rhodium(III), [[2-[(di-phenylphosphino)methyl]-2-methyl-... 

Si2SCjH3o, Disilathiane, hexamethyl-, 29 30 Si C 10H2J, Methane, tris(trimethylsilyl)-, 27 238... 

Introduction of trimethylsilyl substituents attached directly to the ot-carbon atom of a-(benzotriazol-l-yl)alkyl thioethers provide new opportunities. Thus, treatment of lithiated monosubstituted a-(benzotriazol-l-yl)alkyl thioethers with chlorotrimethylsilane produces a-(trimethylsilyl)alkyl thioethers 837. In reactions with hexamethyl-disilathiane and cobalt dichloride, thioethers 837 are converted to thioacylsilanes 838 that can be trapped in a Diels-Alder reaction with 2,3-dimethylbutadiene to form 2-alkyl-4,5-dimethyl-2-trimethylsilyl-3,6-dihydro-27/-thiopyrans 839 (Scheme 133) <2000JOC9206>. 

The synthesis of isothiazole-fused sulfone 265 is based on the same approach and was obtained from sulfolene 520 (see Section 4.05.7.3) <1996TL4189>. Treatment of different heterocyclic n-azidocarbaldehydes with hexamethyl-disilathiane (HMDST) in the presence of HCl as catalyst offers a novel and practicable route to fused isothiazoles 521-523 <1997PS(120)165, 2005SL1965, 2000EJ02171>. 

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