作者:R.A. Auerbach、C.A. Kingsbury
DOI:10.1016/s0040-4020(01)83384-6
日期:1973.1
of pseudocontact shifts using Eu(dpm)3. The conformation of all isomers, regardless of size of R, is similar (trans vicinal protons). The relative stability of the two isomers is also independent of R up to R = t-Bu. The conformation and configuration of the hydride reduction products, the alkyl substituted 1,2,3-triphenyl-1-propanols, are elucidated through use of NMR chemical shifts, coupling constants
通过使用Eu(dpm)3的伪接触位移证明了3-烷基取代的1,2,3-三苯基-1-丙烷的构型。无论R的大小如何,所有异构体的构象都相似(反式邻近质子)。两种异构体的相对稳定性也与R无关,直至R = t-Bu。通过使用NMR化学位移,偶合常数,伪接触位移和IR光谱阐明了氢化物还原产物烷基取代的1,2,3-三苯基-1-丙醇的构象和构型。起始原料和还原产物(一个例外)在相关中心具有相同的构象,但氢化物的攻击方式最好通过过渡态的不同构象来解释,在该过渡态下,LAH在任一非对称位置都接近质子中央。