DONG D. C.; EDWARD J. T., CAN. J. CHEM., 1980, 58, NO 13, 1324-1326
作者:DONG D. C.、 EDWARD J. T.
DOI:——
日期:——
MEHTA G.; CHAUDHURI B., INDIAN J. CHEM., 1979, B 17, NO 5, 421-422
作者:MEHTA G.、 CHAUDHURI B.
DOI:——
日期:——
Stereospecific solid state sodium borohydride reductions of cage dikotenes
作者:Alan P. Marchand、G.Madhusudhan Reddy
DOI:10.1016/s0040-4020(01)82311-5
日期:1991.8
Solid state reductions of carbonyl groups in three cage diketones, 1a-1c, have been performed by usingsodiumborohydride, and the results thereby obtained have been compared with the corresponding reductions performed in ethanol solution. In each case, the solid state reduction proceeds stereospecifically; hydride transfer occurs exclusively at the face of the carbonyl group. In contrast, the corresponding
<sup>1</sup>H NMR Studies of Intramolecular OH/OH Hydrogen Bonds via Titratable Isotope Shifts
作者:Kavoos Kolahdouzan、O. Maduka Ogba、Daniel J. O’Leary
DOI:10.1021/acs.joc.1c01910
日期:2022.2.4
the absence of chemical shift differences (δOHin = δOHout) that are necessary for an equilibrium isotope effect, lending evidence for an intrinsic contribution to the isotope effect. OH/OD isotope shift titration thus provides a means for understanding the origins of these isotope effects and for probing the intact or nonintact nature of intramolecular OH/OH hydrogen bonds in response to intermolecular
溶解在非极性溶剂如 CD 2 Cl 2和苯-d 6中的部分氘化 1,4- 和 1,3-二醇的甲醇滴定提供了1在质子溶剂浓度增加的条件下,OH/OD 同位素位移的 H NMR 测量,诊断完整的分子内氢键。1,4- 和 1,3- 二醇具有构象有利的分子内 OH/OH 氢键可以滴定到恒定的同位素位移值,尽管具有可变的符号,在过量甲醇当量的存在下,提供了在这些条件下完整的分子内氢键的证据状况。相反,当存在过量甲醇时,具有构象不稳定的分子内氢键的 1,3-二醇中的同位素位移滴定为零,这与这些条件下的分子内氢键断裂一致。此外,in = δOH out ),这是平衡同位素效应所必需的,为同位素效应的内在贡献提供了证据。因此,OH/OD 同位素位移滴定提供了一种了解这些同位素效应的起源和探测分子内 OH/OH 氢键响应质子溶剂提供的分子间氢键的完整或非完整性质的方法。