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Stereochemistry of the hydrogenation of o ‐xylene over a silica‐supported polysilazane–platinum complex
Author(s) -
Chen ChunWei,
Zhang Long,
Su ShiJian,
Huang MeiYu,
Mao SuFen,
Jiang YingYan
Publication year - 1996
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(199608)7:8<711::aid-pat574>3.0.co;2-j
Subject(s) - platinum , catalysis , xylene , stereoselectivity , materials science , medicinal chemistry , organic chemistry , chemistry , benzene
Silica‐supported polysilazane (SiO 2 ‐Si‐N), and its platinum complex (SiO 2 ‐Si‐N‐Pt) were prepared. It was found that SiO 2 ‐Si‐N–Pt can catalyze hydrogenation of o‐xylene under mild conditions (40–50°C, 1 atm). The products of the reaction were cis‐and trans‐1,2‐dimethylcyclohexane. The formation of trans‐1,2‐dimethylcyclohexane may be adequately explained according to the ‘roll‐over’ model. The stereoselectivity was influenced by temperature and catalyst concentration, the proportion of the cis isomer decreasing with an increase in each of the two factors. The effects of other reaction parameters, such as the N/Pt mole ratio in the complex, solvents and reaction time, etc. on the hydrogenation of o‐xylene were also studied. The SiO 2 ‐Si‐N–Pt catalyst is very stable in reaction and turnover numbers amount to 200 in 80 hr.