ChemInform Abstract: Conformational Control by Quaternary Centers: Theory, Database Evidence, and Application to Polymers.
✍ Scribed by R. W. ALDER; P. R. ALLEN; K. R. ANDERSON; C. P. BUTTS; E. KHOSRAVI; A. MARTIN; C. M. MAUNDER; A. G. ORPEN; C. B. ST. POURCAIN
- Publisher
- John Wiley and Sons
- Year
- 2010
- Weight
- 30 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0931-7597
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✦ Synopsis
Conformational effects of a quaternary center are clearly defined by molecular mechanics calculations on hydrocarbons. The maximum length of a polymethylene chain between quaternary centers which can be controlled by these effects is -(CH 2 ) 3 -. In comparison with simple alkyl chains, more highly structured side groups in polymers can act as extra conformational control elements. In the case of polymers with planar aromatic side groups like fluorene, cyclohexyl, or adamantane side groups it is difficult to provide unequivocal evidence for the proposed conformations. -(ALDER, R.