Stereochemistry of the hydrogenation of cresol catalyzed by zeolite-supported polyvinyl alcohol–amino acid–platinum complex

✍ Scribed by Ding Xia; Li Liu; Mei-Yu Huang; Ying-Yan Jiang

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 90 KB
• Volume: 10
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199901/02)10:1/2<116::aid-pat780>3.0.co;2-2

✦ Synopsis

Liquid-phase hydrogenation of isomeric cresol was investigated by zeolite-supported polyvinyl alcohol± amino acid±platinum complex catalyst under mild conditions (50°C, 1 atm). The catalyst was found to be very active and stable in the reaction. The initial rates for the hydrogenation of three isomeric cresols decreased in the following order m-cresol b o-cresol b p-cresol. Transmethylcyclohexanol is the most favored product for each of the 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 hydrogenation reactions without appreciable loss in activity.