Azolium-Linked Cyclophanes: A Comprehensive Examination of Conformations by <sup>1</sup>H NMR Spectroscopy and Structural Studies
作者:Murray V. Baker、Mark J. Bosnich、David H. Brown、Lindsay T. Byrne、Valerie J. Hesler、Brian W. Skelton、Allan H. White、Charlotte C. Williams
DOI:10.1021/jo049097o
日期:2004.10.1
o/m-cyclophanes are rigid on the NMR time scale, as indicated by sharp 1H NMR spectra at all accessible temperatures. The non-mesitylene-based m-cyclophanes and the o-cyclophanes are fluxional on the NMR time scale at high temperatures, but in most cases, specific conformations can be “frozen out” at low temperatures. Many structures deduced from solution studies were consistent with those in the solid state
报道了一系列偶氮连接的环烷的合成和表征。环烷由与两个苯环单元(苯,萘,对二甲苯,均三甲苯,1,2,3,4-和1,2,4, 5-四甲基苯,2,6-吡啶,和p -叔通过亚甲基基团丁基苯酚)。检查了在苯环类单元中含有邻位,间位和对位取代模式的环环烷。通过变温NMR研究在溶液中检查了环烷的构象,并且通过晶体学研究在固态下检查了环烷的构象。该P-环番,均三基如在所有可及温度下的1 H NMR清晰光谱所示,m-和o / m-环烷在NMR时标上是刚性的。非均三甲苯基米-cyclophanes和Ò -cyclophanes上在高温下的NMR时间尺度fluxional,但在大多数情况下,特定的构象可以是“冻结了”在低温下。由溶液研究得出的许多结构与固态结构一致。