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The reaction of a swollen 1% divinylbenzene cross-linked polystyrene with hexacarbonylchromium gave polymer-anchored tricarbonylchromium moieties 6 bonded to the polymer's phenyl rings. Using this heterogenized catalyst, methyl sórbate was converted selectively (96-97%) to (Z)-methyl 3-hexenoate with small amounts of methyl hexanoate and (-E)-methyl 2-hexenoate in cyclohexane at 160°and 500 psi of hydrogen. The product distribution was sensitive to solvent and reaction temperature. No significant hydrogenation of cyclohexene or (£,£,£)-!,5,9-cyclododecatriene occurred at 150°and 500 psi of hydrogen in 24 hr. This heterogenized homogeneous catalyst system is discussed in relation to known homogeneous hydrogenation catalysts for methyl sórbate.

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