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By Donald J. Cram, Jane M. Cram

This quantity covers the evolution of host-guest complexation chemistry within the minds and fingers of Nobel Prize winner Donald Cram and his co-workers at UCLA over the interval from 1970 to 1994. It bargains with the basic ideas and goals that govern this speedily constructing topic and illustrates the emergence of the sector of biomimetic chemistry. The publication demonstrates how a few innovations, similar to molecular modelling, synthesis, crystal constitution, NMR resolution constitution and mass spectral constitution determinations could be mixed to improve a brand new department of natural chemistry. It discusses the chemistry of thoroughly new households of complexes - the carceplexes, hemicarceplexes and velcraplexes - and stories the makes use of of the interiors of hemicarceplexes as a brand new section for engaging in chemical reactions and for shielding risky species.

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Trueblood, Top. Curr. , 1981,98,43. B. F. N. Trueblood, J. , 1992, 12, 341. 23 Spherands, Spheraplexes, and Their Relatives CH3 1) BuLi CH3" "CH3 CH3 4) HCl 28% CH3 7 l*LiCI CH3 10 11 CH3 12 24 Chapter 2 CH3 kH3 19 CH3 CH3 20 CH3 CHB 22 environment in the mixed salt 21 to make the ordinarily stable ArOCH3 group very easily subject to nucleophilic substitution under mild conditions. Although we were led to prepare 1 as a result of model examination, we were misled in the cases of 14 and 16, anti-bridged stereoisomers of synbridged spherands 13 and 15.

The crystal structure 93 of coraplex 92 gave the expected s t r ~ c t u r e . ~ ~ The above examples illustrate the importance of CPK molecular modeling to the design of host-guest complexes, and of crystal structure determinations of hosts and complexes to the test of predictions of structure. 1 summarizes the relationship between the biotic and synthetic systems linked together through the use of CPK models. These mechanical models were developed under the National Institutes of Health, Education, and Welfare, the National Science Foundation, and the American Society of Biological Chemists ‘for constructing macromolecules of biological interest’.

J. A. C. Helgeson, J . Am. Chem. ,1988, 110, 571. C. P. Czech, E. R. Gebauer, A. J. Cram, J . Am. Chem. ,1989, 111,6339.

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