Conformational Analysis of 2-Substituted Alkylphosphoryl Compounds. 4. Substituent Effect on the Nature of the Hydrogen Bonding in (2-Hydroxyalkyl)phosphoryl Systems
作者:Daniel G. Genov、Roman A. Kresinski、John C. Tebby
DOI:10.1021/jo972036o
日期:1998.4.1
dissolution has been investigated using X-ray crystallography, IR, and NMR spectroscopy. Intermolecular hydrogen bonding involving inversion-center-related cyclic dimers is shown to be a common solid state arrangement, with relatively small structural changes producing infinite chains. Intramolecular hydrogen bonded monomers are uncommon. Conflicting X-ray and IR evidence on the equivalence of hydrogen bonding
五个(2-羟烷基)磷酰基化合物2a-e [R(1)(2)P(O)CH(2)CH(OH)R(2)的固态构象和氢键键合度的程度;2a,R(1)= MeO,R(2)= Ph; 2b,R(1)= R(2)= Ph; 2c,R(1)= Ph,R(2)= Bu(t); 2d,R(1)= Me,R(2)= Ph; 在图2e中,已经使用X射线晶体学,IR和NMR光谱研究了溶解时的R(1)= Me,R(2)= Bu(t)]变化。涉及与反转中心相关的环状二聚体的分子间氢键显示为常见的固态排列,具有相对较小的结构变化,产生无限链。分子内氢键键合单体并不常见。讨论了有关固态2b的二聚体结构中氢键等效的X射线和IR证据的矛盾。已经研究了溶解时发生的氢键变化,并且证据表明通常会建立二聚体和单体之间的平衡,当庞大的基团(R(1)和R( 2))存在。构象偏好主要由空间因素(R(2)的大小)决定,几乎不受氢键键合性质的改变