Syntheses and X-ray crystal structures of poly(pyridylsulfanylmethyl)arenes: new multi-armed molecules
摘要:
The synthesis of a series of seven new poly(pyridylsulfanylmethyl)arenes is reported. These are readily prepared from either 2- or 4-mercaptopyridine and a poly(bromomethyl)arene in the presence of triethylamine. Compounds with three, four, six and eight pyridylsulfanylmethyl arms are reported. These have been fully characterised and, in four cases, the relative orientations of the pyridylsulfanylmethyl arms have been ascertained by X-ray structural analysis. (C) 2003 Elsevier Science Ltd. All rights reserved.
Octasubstituted biphenylenes: is there a favoured conformation?
作者:Peter J. Steel、David A. McMorran
DOI:10.1107/s0108270107022779
日期:2007.7.15
Octakis(pyrazol-1-ylmethyl) biphenylene ethanol solvate, C44H40N16 center dot C2H6O, has two independent centrosymmetric molecules, one of which is hydrogen bonded to the solvent molecule. One molecule adopts an arrangement with three arms up and one down in each benzene ring, whilst the other molecule has a conformation with two adjacent arms on the same side of the ring. In neither case is the expected fully alternating form observed.