| abstract |
A process for the preparation of a halogen silane and an aromatic compound having at least one -C=O- of <IMAGE> group, while simultaneously effecting cleavage of a siloxane by contacting a compound having at least one aromatically bound mono and/or dihalogen methylene group or an aromatic compound having a mono-, di and or trihalogen methyl group of the formula <IMAGE> wherein the aromatic moiety can be optionally otherwise substituted, with a siloxane of the formula <IMAGE> wherein each R moiety is independently selected from the group consisting of halogen, alkyl, alkenyl and O-SiR3, wherein such R moiety is halogen, alkyl or alkenyl, wherein at least two of the R moieties can, together with the silicon atom to which they are attached, form a ring, at an elevated temperature in the presence of a catalytic amount of a metal or a metal compound, which metal is of the sub-group of elements or of the 5th principal group of the periodic system of the elements, together with a proton donor, or in the presence of a catalytic amount of an oxygen acid. |