Electronic State of Push−Pull Alkenes: An Experimental Dynamic NMR and Theoretical ab Initio MO Study
作者:Erich Kleinpeter、Sabrina Klod、Wolf-Dieter Rudorf
DOI:10.1021/jo0496345
日期:2004.6.1
Generally, the agreement between the experimental and theoretically calculated 13C chemical shifts was good with only the carbons of the carbonyl, thiocarbonyl, and cyano groups deviating significantly. The substituents on the different sides of the central CC partial double bond were classified qualitatively with respect to their donor (S,S < S,N < N,N) and acceptor properties (C≡N < CO < CS) and according
记录了许多推挽式烯烃的1 H和13 C NMR光谱,并使用GIAO扰动法计算了13 C化学位移。在尝试过的各种理论水平中,发现具有三ζ价基集的MP2计算对于提供可靠的结果是最有效的。还考虑了溶剂的影响,但仅通过单点计算即可。通常,在实验上和理论上计算出的13 C化学位移之间的一致性很好,仅羰基,硫代羰基和氰基的碳明显不同。中心碳不同侧的取代基C部分双键按其给体(S,S