Solution and solid carbon-13 magnetic resonance study of the conformation of 9,10-dihydroanthracene and its 9,10-methylated derivatives
作者:Don K. Dalling、Kurt W. Zilm、David M. Grant、William A. Heeschen、W. James Horton、Ronald J. Pugmire
DOI:10.1021/ja00406a025
日期:1981.8
13/C NMR chemical shifts of the 9,10-methylated 9,10-dihydroanthracenes have been obtained, both in the traditional manner in solution and in the solid state by use of cross polarization and magic angle spinning techniques. In addition, the temperature dependence of the solution chemical shifts was measured from about -70 to 40/sup 0/C. Chemical shift effects resulting from methyl substitution are discussed
9,10-甲基化 9,10-二氢蒽的 /sup 13/C NMR 化学位移已经通过使用交叉极化和魔角旋转技术以传统方式在溶液中和固态中获得。此外,溶液化学位移的温度依赖性从大约-70 到 40/sup 0/C 测量。讨论了由甲基取代引起的化学位移效应。对表现出不等加权构象平均的三种化合物的可变温度甲基位移进行非线性最小二乘回归分析,并给出了相关的热力学和化学位移参数。当存在孪生甲基时,固体和溶液光谱都表明环变平。此外,