By reacting ,-unsaturated carboxylic esters with hydrosilanes or hydrosiloxanes in the presence of a catalytic amount of tris(pentafluorophenyl)borane, silyl ketene acetals or disilyl ketene acetals with high purity are produced in high yields.

 
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< Water-soluble cellulose ether having improved filtering characteristics and selection method

< Process for direct oxidation of propylene to propylene oxide and large particle size titanium silicalite catalysts for use therein

> Oxidation reaction process catalyzed by phase-transfer catalyst controlling reaction

> Processes for preparing -hydroxy-ketones and ,-unsaturated ketones
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