X-ray Structures of Cyclophanes Derived from Naphtho[1,2-<i>c</i>:5,6-<i>c</i>]difuran and the Synthesis, Structure, and Reaction Kinetics of Its 1,3,6,8-Tetrasilylated Derivative
作者:Steven J. Robbins、Michelle E. Thibault、Jason D. Masuda、David R. Ward、René T. Boeré、Peter W. Dibble
DOI:10.1021/jo900582r
日期:2009.8.7
of magnitude, consistent with predictions based on their structure-count ratios and with the reactivity of the novel 1,3-bis(tert-butyldimethylsilyl)isobenzofuran. Crystal structures of two cyclophanes derived from the reaction of naphtho[1,2-c:5,6-c]difuran and bis(imide) or bis(ester) dienophiles show marked differences in the conformation of the aliphatic chain found in the solid state.
甲硅烷基化衍生物的萘[1,2 Ç:5,6- Ç ]二呋喃,1,3,6,8-四(叔丁基二甲基)萘并[1,2- Ç:5,6- Ç ]二呋喃,已分离,并确定了其X射线晶体结构。键的定位证实了该异苯并呋喃环系统的多烯特性。此分子经历了两个连续的Diels-Alder反应,其二级速率常数相差超过2个数量级,这与基于其结构数比的预测以及新型1,3-双(叔丁基二甲基甲硅烷基)的反应性相符异苯并呋喃。萘[1,2- c:5,6- c的反应衍生的两个环烷的晶体结构双呋喃和双(酰亚胺)或双(酯)亲二烯体在固态脂肪族链的构象上显示出显着差异。