<sup>19</sup>F nuclear magnetic resonance studies of aromatic compounds. Part V. Conformational preferences of side chains in ortho-substituted para-fluoro-acetophenones,-α-methylstyrenes, and -αα-dimethylbenzyl alcohols
作者:Morris G. Belsham、Andrew R. Muir、Michael Kinns、Lawrence Phillips、Li-Ming Twanmoh
DOI:10.1039/p29740000119
日期:——
shielding of para-fluorine nuclei in the series of acetophenones and α-methylstyrenes named in the title is used to estimate the interplanar angle between the side chain and the ring in the preferred conformations. In the series of dimethylbenzyl alcohols, an analogous torsion angle (between the C–OH bond and the aromatic ring) is defined and estimated. No information is obtainable from the 19F n.m.r. studies
的屏蔽段在系列中的标题命名为苯乙酮和α甲基苯乙烯的-氟核被用于估计在优选的构象的侧链和环之间的面间角。在二甲基苄醇系列中,定义并估算了类似的扭转角(在C–OH键和芳环之间)。从19 F nmr研究无法获得有关侧链与原取代基之间的顺式或反式关系的信息,因为估算的角度可能对应于两种情况。分析方法利用CNDO / 2 MO计算方法,其中电荷密度分布随每个系列的代表性成员中侧链构象的变化而变化。