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By Jack Cazes; Raymond P W Scott

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The selectivity depends upon factors such as the Si/Al ratio and the water content of the catalyst, or the substrate loading but in all circumstances the terminal methyl sites are favoured. For reaction in the pores of the zeolite primary/secondary selectivity is about 6 and there is also some selectivity between secondary sites. It is not clear whether the photolysis of Cl2 occurs inside or outside of the catalyst pores but this intriguing process must have considerable potential for the development of synthetic procedures with selectivities unattainable in solution.

P. J. D. Mahadevan, and M. , 1985,92,327). A very mild catalytic hydrogenation of alkenes (room temperature and atmospheric pressure) can be carried out in biphasic-water systems or without solvent using triphenyl- 50 phosphine meta-trisulfonate as an efficient reagent in the presence of rhodium salts. High yields of easily isolable products can be obtained (C. Larpent, R. Dabard, and H. , 1987,28,2507). (c) Homologation, oligomerisation, metathesis, and coupling of a~enes The synthesis of alkenes and alkanes using the FischerTropsch synthesis has been studied for many years as it is a process of considerable industrial interest.

4542, and other references). C. S. C. Brown, N. U. , 1980,45,384). The preparation of the simple organoboranes methyl- and dimethylborane has been simplified and their characteristics as hydroborating agents have been investigated. These reagents react with good regioselectivity and selectivity with terminal and trisubstituent alkenes and good yields of tertiary alcohols containing one or two methyl groups can be achieved. C. , 1986,51,4925). K. C. C. E. Rice and Y. , 1982,47,4189). However, in spite of all the studies of this important reaction, precise mechanistic details are still subject to discussion.

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