ISSN:
1042-7147
Keywords:
hydrogenation
;
o-xylene
;
polysilazane
;
stereochemistry
;
platinum complex
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Silica-supported polysilazane (SiO2-Si-N), and its platinum complex (SiO2-Si-N-Pt) were prepared. It was found that SiO2-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 SiO2-Si-N-Pt catalyst is very stable in reaction and turnover numbers amount to 200 in 80 hr.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
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