Patent ID: 6156948
Filing Date: 2000-12-05
Classification: B01J,C07C

Abstract:
A process for the selected preparation of a styrene of the formula (1) ##STR5## by reacting an acetophenone of the formula (2) ##STR6## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are identical or different and are each H, F, Cl, Br or I or a C.sub.1 -C.sub.30 -group, which optionally contains heteroatoms, or two or more of the radicals R.sup.1 to R.sup.5 together with the atoms connecting them optionally forms one or more substituted or unsubstituted rings,with hydrogen in the presence of a catalyst comprising one or more oxides has the formula (3)Zn.sub.a M.sup.1.sub.b M.sup.2.sub.c O.sub.xwhereM.sup.1 is at least one element selected from the group consisting of Al, Zr, Ti and Si;M.sup.2 is at least one element selected from the group consisting of Cd, Cu, Ag, Ni, Co, Fe, Mn, Cr, Mo, Ta, Sc, W, V, Nb, Hf, Yt, B, In, Pd, Bi, Se, Ga, Ge, Sb, As, Te, and the lanthanide elements,B is 0-2,C is 0-3, andX is the number of oxygen atoms necessary to balance the charge which is determined by the oxidation states of Zn, M.sup.1 and M.sup.2 or a catalyst has the formula (4)M.sup.3.sub.2 M.sup.4 O.sub.4 ( 4)whereM.sup.3 is an element in the oxidation state I andM.sup.4 is an element in the oxidation state VI.