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New Sterically Driven Mode for Generation of Helical Chirality

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posted on 16.04.2009, 00:00 by Hisanori Ueki, Vadim A. Soloshonok
The presented results and the available literature data convincingly suggest that there is a new sterically driven mechanism for the formation of supramolecular helicity in the solid state. This mechanism requires the presence of sterically bulky groups, such as tert-butyl, for which the spiral arrangement in uninterrupted hydrogen-bonding chains, serving as an axis for helical structure and maximizing the repulsive stereochemical interactions, provide for the most efficient, spatially economical accommodation of these groups in a crystallographic unit cell.