Study of the catalytic activity of metal complexes fixed on solid supports. 8. Immobilized Rh and Pd complexes in the dehalogenation reaction of halogenated derivatives of benzene and cyclopropane by hydrogen transfer from alcohols and sodium borohydride

1. Rhodium and palladium complexes immobilized on amino and aminophosphinated silica gels and polymers containing heterocyclic amine groups catalyze hydrodehalogenation of p-bromotoluene and gem-dihalocyclopropanes by hydrogen transfer from 2-propanol and sodium borohydride. 2. Only partial dehalogenation of gem-dihalogenides occurs with rhodium complexes and 2-propanol. For NaBH4, successive substitution of two halogen atoms occurs. Reduction of gem-dibromides is easier than that of gem-dichlorides. The reaction rate and stereo-selectivity depend on the nature and position of the substituent in the cyclopropane.