| http://www.w3.org/ns/prov#value | - The catalyst system, which is an essential feature of the present novel process, comprises (1) a catalyst of the type Al(R) X, wherein R is a branched or straight chain C C alkyl and X is selected from the group consisting of hydrogen and halogen, and (2) a promoter comprising a solid (frozen) inorganic acid selected from the group consisting of the inorganic oygenated acids of sulfur, nitrogen, p
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