By Peter R. Ashton, Richard A. Bissell, Douglas Philp (auth.), V. Balzani, L. De Cola (eds.)

The first NATO technological know-how discussion board was once held in Biarritz in September 1990. This Taormina convention is the second one in a sequence that we want to be an extended one and that i think that it has equalled the good fortune of its predecessor. In establishing those conferences the NATO technological know-how Committee desired to assemble prime specialists to check fields of robust current curiosity. It used to be meant that displays and discussions may still pay distinct cognizance to capability advancements. This "forward glance" is certainly valuable to us in mapping out the evolution of our technological know-how Programme yet extra importantly, it truly is a vital a part of the growth of technology. i think that NATO, having the ability to collect eminent scientists from either side of the Atlantic, is in a priviliged place to supply this provider to our medical group. It was once in basic terms right that Chemistry could be one of many first components to be special: a relevant technology with many wealthy borders relating different disciplines, it deserved the whole awareness of our Committee. In its massive area, between many attainable themes, the current one was once rigorously chosen and its selection resulted from an intensive session of many prime chemists. the big fraction of replies which pointed to Supramolecular Chemistry left us with little question concerning the timeliness of a discussion board during this zone and the powerful curiosity connected to it.

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Soc. 113, 1349-1354. , and Aoyama, Y. (1992) 'Complexation of chiral glycols, steroidal polyols, and sugars with a multibenzenoid, achiral host as studied by induced circular-dichroism spectroscopy: exciton chirality induction in resorcinol-aldehyde cyclotetramer and its use as a supramolecular probe for the assignments of stereochemistry of chiral guests', J. Am. Chern. Soc. 114, in press. , and Ogoshi, H. (1988) 'Polar host-guest interaction. Binding of nonionic polar compounds with a resorcinol-aldehyde cyclotetramer as a lipophilic polar host', J.

1. CALIXCROWN ETHERS 37 The tetraalkylation of calix[4]arenes at the lower rim with groups bulkier than CH3 results in the formation of a mixture of stereoisomers. cone partial cone 1,2 alternate 1,3 alternate By changing the nature of the base and the solvent a certain control of the stereochemical outcome has been achieved in few alkylation [15] and acylation [24] reactions of calix[4]arenes. Recently, in collaboration with the group of Prof. N. Reinhoudt, several stereoisomeric calix[ 4]arene crown ethers have been synthesized and their ionophoric properties toward alkali metal cations determined by the Cram's extraction method [25].

Self-assembly in chemical systems offers a new and exciting conceptual challenge to synthetic chemists. The irony of what is beginning to happen in the development of synthetic chemistry is intriguing to behold. Just as natural products and their analogues have been synthesised more often than not by quite unnatural means, so it is that unnatural products and new materials will be prepared increasingly by approaches that are reminiscent of natural processes. 4. S. (1991) 'Self-Assembly Processes' New J.

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