Organosilane Thiols Selenols, Tellurols

Organosilane thiols (mercaptoorganosilanes) are covalent monomers which are easily soluble in organic solvents. They are strongly acidic the acidity of the aryl compounds decreases in the progression  

Arylsilane thiols are more stable to hydrolysis than the very labile alkylsilane thiols. Triphenylsilane thiol was not hydrolysed after 24 h at 20 °C in a water/dioxane mixture [325]. Triphenyl, tribenzyl and tris(4-methoxyphenyl) mercaptQSilanes do not lose the hydrogen sulphide below 200°C [325]. 

Organosilane thiols have been prepared conventionally from halogenorganosilanes and hydrogen sulphide, s.g. diethyl(triethylsilylmethyljsilanethiol [327] (80% b.p. 113 114°C at 0.47 kPa = 3.5 mm Hg) is prepared from bromodiethyl(triethyl-silylmethyl)silane and a hydrogen sulphide solution in pyridine/toluene. 

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