The Effect of Charge-Transfer Complexation/π-Stacking Interactions in Lowering the Activation Barrier of the Bergman Cyclization
作者： Amit Basak , Subhendu Sekhar Bag , Amit K. Das
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摘要: To elaborate the concept of weak interactions and their effect on Bergman Cyclization (BC), several 1,2-dikynyl benzenes incorporating various combinations donor acceptor units in two arms enediynes were designed synthesized, charge-transfer followed by UV/Vis spectroscopy. The thermal reactivities, as studied DSC, show an increase reactivity for donor/acceptor or donor/donor relative to acceptor/acceptor pair. Such can be explained basis intramolecular charge transfer π-stacking between arms, which may lower distance acetylenic ends. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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