No abstract

:The complex supported on pro-c-Al 2 O 3 duces a catalyst which is considerably more active and sulfur-resistant for the hydrogenation of cyclohexene carried out in mild conditions than a conventional catalyst obtained from acid solutions of and even than the same complex NiCl 2 unsupported. As determined by XPS, the active species is the complex itself, which is stable under the reaction conditions. The higher sulfur-resistance is attributed to electronic and geometrical e †ects. The catalyst system is considerably more resistant to poisoning with thiophene than with tetrahydrothiophene.1998 SCI (