3D QSAR分子描述符和人工神经网络的组合已用于预测各种部分氟化有机化合物的亲氟性,即全氟(甲基环己烷)/甲苯分配系数的自然对数。预测的平均误差小于0.2实验误差的两倍。多元线性回归证明效率低得多。为了更好地表征氟分配现象,将特定的氟定义为氟的亲和性以及被排出的氟溶剂与进入的溶质分子的范德华体积比的乘积。这个无量纲的术语在化合物家族中与所计算的氟分子的希尔德布兰德参数具有很好的相关性。
An improved design of fluorophilic molecules: prediction of the ln P fluorous partition coefficient, fluorophilicity, using 3D QSAR descriptors and neural networks
作者:László E. Kiss、István Kövesdi、József Rábai
DOI:10.1016/s0022-1139(01)00342-6
日期:2001.3
entering solute molecules. This dimensionless term correlates well in a compound family with the calculated Hildebrand parameters of the fluorousmolecules. The trifluoromethyl group was found highly effective for increasing the fluorous phase affinities of modelcompounds when used in combination with longer perfluoroalkyl groups.
3D QSAR分子描述符和人工神经网络的组合已用于预测各种部分氟化有机化合物的亲氟性,即全氟(甲基环己烷)/甲苯分配系数的自然对数。预测的平均误差小于0.2实验误差的两倍。多元线性回归证明效率低得多。为了更好地表征氟分配现象,将特定的氟定义为氟的亲和性以及被排出的氟溶剂与进入的溶质分子的范德华体积比的乘积。这个无量纲的术语在化合物家族中与所计算的氟分子的希尔德布兰德参数具有很好的相关性。
Changing Mechanisms in the β-Cyclodextrin-Mediated Hydrolysis of Phenyl Esters of Perfluoroalkanoic Acids
作者:Mariana A. Fernández、Rita H. de Rossi
DOI:10.1021/jo034402b
日期:2003.9.1
The rate of hydrolysis of esters CF(3)(CF(2))(n)COOPh (1 (n = 1), 2 (n = 2), and 3 (n = 6)) was measured at pH 6.00 and at pH higher than 9.00 in the presence of beta-cyclodextrin (beta-CD). For compounds 1 and 2 the reaction rate decreases as the beta-CD concentration increases, and they show saturation effects at all pH. It is suggested that the substrate forms an inclusion complex with cyclodextrin