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By Iwao Tabushi (auth.), R. Setton (eds.)

The easy suggestion of the NATO overseas alternate application for investment a sophisticated learn Workshop on "Chemical Reactions in natural and Inorganic limited structures" used to be to give a contribution to a greater below­ status of the effect of configurational constraints on response mechanisms, as imposed on reagents by way of natural or inorganic templates. the unique personality of the Workshop used to be to assemble natural and inorganic chemists with this universal curiosity on the way to advertise the trade of principles and, ultimately, interdisciplinary study. all of the individuals to the Workshop agreed that the discussions have been stimulating and fruitful. The judgement of the reader of the complaints might be extra restrictive as the director (Professor J. J. FRIPIAT) and co-director (Professor P. SINAY), confronted with the most unlikely job of protecting such an important area, have been obliged to choose, a bit arbitrarily, a restricted variety of issues which appeared to them to be crucial. Their selection might be mentioned and there without doubt are very important gaps, with fields that have been no longer thought of. even though, either organisers think that, in the restricted span of time and variety of participants, lots of the intriguing components have been addressed. Dr. WARNHEIM was once type adequate to write down a remark at the Workshop; his precis, written with the hindsight of some weeks, helps, we think, this opinion. Dr. SETTON has authorized the weight of gathering and shaping (not selectively) the manuscripts. This publication wouldn't be what it truly is with no his effective contribution as clinical secretary of the Workshop.

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R. Breslow, Centenary Lecture, Chern. Soc. , 1, 553 (1972). 2. R. L. van Etten, J. F. Sebastian, G. A. Clowes and M. C. Bender, J. Am. Chern. a. L Czarniecki and R. Breslow, J. Amer. Chern. , 100, 771 (1978); b. R. F. Czarniecki, J. Emert, and H. Hamaguchi, J. Amer. Chern. , 102, 762 (1980): c. G. Trainor, R. Breslow, J. Ame;-: Chern. , 103, 154 (1981); d. R. Breslow, G. Trainor, and A. Ueno, J. Am. Chern. , 105,2739 (1983). 4. J. Ie Noble, S. Srivastava, R. Breslow and G. Trainor, J. Am. Chern.

E. Overman, J. Amer. Chern. , 92, 1075 (1970). 6. g. B. Siegel, A. Pinter, and R. Breslow, J. Amer. Chern. , 99, 2309 (1977). 7. G. Trainor, unpublished work. 8. A. Ueno, R. , 23, 3451-3454 (1982). 9. R. W. Czarnik, J. Am. Chern. , 105, 1390 (1983). 10. K. Nakasuji. unpublished work. 11. D. J. Cram and H. E. Katz. J. Am. Chern. Soc •• lOS. 135 (1983). 12. D. Cram, International Symposium on Bioorganic Chemistry, New York, 1985. 13. D. Rideout, R. Breslow. J. Amer. Chern. , 102,7816 (1980). 14. R.

It seemed to us likely that we could achieve stereochemical control of the synthesis of amino acids during transamination if we could attach a proton transfer catalytic group to pyridoxamine, and if it would act not only to remove the proton from the CH group of pyridoxamine but also to put that proton on the new asymmetric carbon of the product amino acid. As we have described,(21) kinetic studies indicate that this mechanism operates provided we use a sufficiently long flexible base. With such a basic arm attached at C-5 of pyridoxamine we observe much faster transamination, and the dependence of the rate on the length of the basic arm indicates clearly that the base is acting to deliver the proton to the new carbon, not just remove it from the CH~ group.

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