2-丁醇,2-丁醇-2d 1,赤型-2-丁醇-3d 1,(EB),2-甲基-2-丙醇(2M2P)和1,1,1,3,3,3的反应-hexadeuterio-2-methyl-2-propanol(HDMP)分别具有CCl 4和Ph 3研究了在36–85°C温度范围内的极性或非极性溶剂中的P。对于2-丁醇,脱水产物的分数随温度升高而增加;(2M2P)观察到相反的温度效应。脱水是(2M2P)(85-95%)的主要途径,但2-丁醇(75-95%)的取代(OH被Cl取代)是主要的途径。(EB)的转化使丁烯中的氘保留,表明98%或更多的脱水遵循抗消除途径,因此优先考虑Saytzeff消除。(EB)和(HDMP)的烯烃形成步骤的氘消除同位素效应(k H / k D)约为2.0,并且温度和溶剂极性均未对(k H k D)产生影响)在调查范围内。出乎意料的是,对于(EB)而不是(HDMP)形成卤代烷的相对速率存在同位素效应。
Enantiomeric Analysis of Homologous Series of Secondary Alcohols by Deuterium NMR Spectroscopy in a Chiral Nematic Liquid Crystal: Influence of Molecular Geometry on Chiral Discrimination
NMR measurements of the differential ordering effect (DOE) are presented for homologous series of 22 chiral secondary aliphatic alcohols dissolved in a poly-(gamma-benzyl-L-glutamate) (PBLG)/dichloromethane liquid-crystalline solvent. The quadrupolar splittings of the solutes, which were deuterated at their chiral centres, were measured as a function of the PBLG concentration and temperature. The proton dipolar splittings of the dichloromethane in each sample were also measured and used as a reference. The results are analysed qualitatively in terms of the structures of the molecules and their asymmetric (or chiral) characteristics. Emphasis is put on comparative analysis of the chiral discrimination in members of each particular homologous series and on evaluating the Limits of the technique for molecules that have two very similar groups attached to their stereogenic centres.
BANERT K.; BUNSE M.; ENGBERT T.; GASSEN K. -R.; KURNIANTO A. W.; KIRMSE W+, REC. TRAV. CHIM. PAYS-BAS, 105,(1986) N 9, 272-278
作者:BANERT K.、 BUNSE M.、 ENGBERT T.、 GASSEN K. -R.、 KURNIANTO A. W.、 KIRMSE W+
DOI:——
日期:——
Optically Active Butane-2-d. III. Verification of Configuration by Elimination Reactions<sup>1</sup>
作者:G. K. HELMKAMP、N. SCHNAUTZ
DOI:10.1021/jo01086a022
日期:1959.4
Deuterium isotope studies of the dehydration alcohols by reaction with triphenylphosphine-tetrachloromethane
作者:Hossein A. Dabbagh、Boris Franzus、Thomas T.-S. Huang、Burtron H. Davis
DOI:10.1016/s0040-4020(01)80935-2
日期:1991.1
(2M2P) (85–95%) but substitution (of OH by Cl) was dominant for 2-butanol (75–95%). Deuterium retention in the butenes from the conversion of (EB) indicated that 98% or more of the dehydration followed an anti-elimination pathway, and there was a preference for Saytzeff elimination. An isotope effect for deuterium elimination (kH/kD) for the alkene-forming step for (EB) and (HDMP) was about 2.0, and
2-丁醇,2-丁醇-2d 1,赤型-2-丁醇-3d 1,(EB),2-甲基-2-丙醇(2M2P)和1,1,1,3,3,3的反应-hexadeuterio-2-methyl-2-propanol(HDMP)分别具有CCl 4和Ph 3研究了在36–85°C温度范围内的极性或非极性溶剂中的P。对于2-丁醇,脱水产物的分数随温度升高而增加;(2M2P)观察到相反的温度效应。脱水是(2M2P)(85-95%)的主要途径,但2-丁醇(75-95%)的取代(OH被Cl取代)是主要的途径。(EB)的转化使丁烯中的氘保留,表明98%或更多的脱水遵循抗消除途径,因此优先考虑Saytzeff消除。(EB)和(HDMP)的烯烃形成步骤的氘消除同位素效应(k H / k D)约为2.0,并且温度和溶剂极性均未对(k H k D)产生影响)在调查范围内。出乎意料的是,对于(EB)而不是(HDMP)形成卤代烷的相对速率存在同位素效应。