The Effect of Charge-Transfer Complexation/?-Stacking Interactions in Lowering the Activation Barrier of the Bergman Cyclization
作者:Amit Basak、Subhendu Sekhar Bag、Amit K. Das
DOI:10.1002/ejoc.200400660
日期:2005.4
To elaborate the concept of weak interactions and their effect on Bergman Cyclization (BC), several 1,2-dikynyl benzenes incorporating various combinations of donor and acceptor units in the two arms of the enediynes were designed and synthesized, and their charge-transfer interactions followed by UV/Vis spectroscopy. The thermal reactivities, as studied by DSC, show an increase in reactivity for the
为了阐述弱相互作用的概念及其对伯格曼环化 (BC) 的影响,设计并合成了几种 1,2-二炔基苯,在烯二炔的两个臂中结合了供体和受体单元的各种组合,以及它们的电荷转移相互作用其次是紫外/可见光谱。DSC 研究的热反应性表明,相对于受体/受体对,供体/受体或供体/供体组合的反应性增加。这种反应性的增加可以基于分子内电荷转移和两个臂之间的 π 堆积相互作用来解释,这可能会降低两个炔端之间的距离。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)