作者:N.S. Zefirov、I.V. Baranenkov
DOI:10.1016/s0040-4020(01)88686-5
日期:1983.1
conformational equilibria of the titled compounds, 10–13, have been determined by 1HNMR and analysed in terms of steric (A(1,3) repulsion, 15) and electronic effects. The conformational equilibria of OMe and Br derivatives depend on the position and electronic properties of ω-substituent/s, attached to the double bond, which may be rationalized in terms of “anomeric” type of resonance, 9. In contrast
标题化合物的构象平衡,10 - 13,已经通过确定1 ħ NMR和在空间(A方面分析(1,3)排斥,15)和电子效应。OMe和Br衍生物的构象平衡取决于与双键相连的ω-取代基的位置和电子性质,这可以根据共振的“端基”型9进行合理化。相反,OAc衍生物是空间排斥的对象,远处的CHCN和C(CN)2基团的电子影响可忽略不计。