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The Lewis acid-hydrocarbon complex catalyst is the product of reaction of at least (a) a Lewis acid of the formula R.sub.(m-2-z) MX2+z wherein M is a Group 3a, 5a or 5b metal, X is a halide, R is a hydrocarbyl radical having 1 to 12 carbon atoms, m is an integer equal to the greatest oxidation state of M, and z is an integer of 0, 1 or m-2; (b) a hydrogen halide; and (c) an organic compound se
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