D. Xia et al., Stereochemistry of the hydrogenation of cresol catalyzed by zeolite-supported polyvinyl alcohol amino acid platinum complex, POLYM ADV T, 10(1-2), 1999, pp. 116-119
Liquid-phase hydrogenation of isomeric cresol was investigated by zeolite-s
upported polyvinyl alcohol-amino acid-platinum complex catalyst under mild
conditions (50 degrees C, 1 atm). The catalyst was found to be very active
and stable in the reaction. The initial rates for the hydrogenation of thre
e isomeric cresols decreased in the following order m-cresol > o-cresol > p
-cresol. Transmethylcyclohexanol is the most favored product for each of th
e three cresols in cyclohexane solvent. The yields and the cis/trans ratios
of the end products were affected by the solvents and amino acids selected
. The catalyst can be recycled for more than three times in the hydrogenati
on reactions without appreciable loss in activity. (C) 1999 John Wiley & So
ns, Ltd.