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出 处:《北京化工大学学报(自然科学版)》2011年第5期40-45,共6页Journal of Beijing University of Chemical Technology(Natural Science Edition)
摘 要:使用gen(B3LYP/6-31G(d)∶STO-3G)混合基组的量子化学计算方法,探讨了当H,F和CH3作为取代基时,LAl[η2-C2R2](L=HC[(CMe)(NAr)]2,Ar=2,6-iPr2C6H3)与CO发生插入反应的机理,并结合NBO分析的结果讨论了不同取代基的电子效应对反应势垒的影响。结果表明,F作为取代基时反应的势垒最大,CH3最低,即供电子基团取代有利于反应的活性。Quantum chemical calculations using the gen (B3LYP/6-31G(d) : STO-3G) mixed basis sets have been employed to study the mechanism of the reaction of LA1 [ η2-C2R2 ] ( L = HC [ (CMe) (NAr) ]2, Ar = 2,6- iPr2C6H3 , R = H, F, CH3) with CO. The different electronic effects of the three substituents on the reaction barri- er were studied using natural bond orbital (NBO) analysis. The results show that with fluorine as the substituent the potential energy is a maximum, whilst the methyl substituent gives the lowest energy, i. e. , electron-donating groups favor reaction.
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