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Abstract:The platinum-catalyzed hydrosilylation of allyl chloride with trichlorosilane was investigated in an ionic liquid-organic biphasic reaction mode. After an ionic liquid screening and repetitive batch mode experiments, the process was realized in a continuous mode using a loop reactor concept with integrated continuous separation and recycling of the ionic liquid catalyst phase. The continuous reactor could be operated for 48 h at constant activity and selectivity without addition of platinum indicating that platinum leaching into the product phase was far below 1 ppm. Enhanced selectivity for the product trichloro(3-chloropropyl)silane (compared to the stateof-the art) and the possibility to use simple platinum tetrachloride (PtCl 4 ) as platinum source are further attractive features of this new ionic liquid-based process concept.

In contrast to the stepwise oxidative dealkylation of steroids [Eq. (1)], (+)-marmesin (1) is directly converted by the psoralen synthase (a cytochrome P450) into the phototoxic furanocoumarin psoralen (2) and acetone. The dealkylation proceeds as a syn elimination.

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