1- Methyl-3,5-diphenylthiabenzene 1-oxide

Reactions.—1-Methyl-3,5-diphenylthiabenzene 1-oxide is a novel sulphur ylide ligand in tricarbonyl-chromium, -molybdenum, and -tungsten complexes (14),... 

The agents used for oxidative aromatization of 2/f-thiopyrans were trityl perchlorate,42-155,156 tetrafluoroborate,267 and iodide.267 Thus 3,5-diphen-yl-2//-thiopyran (222) was found to aromatize either on its own to thiopyrylium salts 396 or by S-methylation to l-methyl-3,5-diphenylthiabenzene (398) via intermediate 397,267 as shown in Scheme 18. 

Thiabenzene I-oxide. The reaction of 1,3-disubstituted 2-propynones such as l,3-diphenyl-2-propyn-I-onc (1) with dimethyloxosulfonium methylide in DMSO at 16.5° gives l-mcthyl-3,5-disubstituted thiabenzene I-oxides in the case of (I) the product is l-methyl-3,5-diphenylthiabenzene l-oxide (3), obtained in 76% yield. If the reaction is carried out in THF-DMSO at - 8°, the intermediate (2) can be isolilted it probably arises by Michael addition of the reagent to (I). 

C2iHisCrOaS, (1-Methyl-3,5-diphenylthiabenzene-l-oxide)tricarbonyl-chromium, 44B, 788... 

Thiabenzene Oxide Complexes.—Reactions of l-methyl-3,S-diphenylthiabenzene-1-oxide (L) with (MeCN)aM(CO)3 (M = Cr, Mo, or W) have afforded complexes of the type LM(CO)s crystal-structure analyses have established that the cyclic ligand is non-planar with only the five carbon atoms bonded to the metal atom. ... 

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