Alkyl-Substituted Allylic Lithium Compounds: Structure and Dynamic Behavior
作者:Gideon Fraenkel、Fayang Qiu
DOI:10.1021/ja002248u
日期:2000.12.1
methyl-substituted allylic lithium compounds have been prepared by CH3Li cleavage of their corresponding bis(methyl)bis(allylic)stannanes. Low-temperature 13C and proton NMR studies of 1:1 complexes of these allylic lithium compounds with TMEDA establish their structures. NMR line shape changes with temperature provide barriers to rotation. Results are listed in order as follows (allyl substituents, compound number
Synthesis and properties of quaternary ammonium salts on the basis of piperidine
作者:R. R. Rakhmatullin、V. I. Levashova、T. F. Dekhtyar’
DOI:10.1134/s0965544113020102
日期:2013.3
Quaternaryammoniumsalts have been synthesized frompiperidine and alkenyl halides (4-chloropent-2-ene, 2-methyl-3-chlorobut-1-ene, 3-methyl-3-chlorobut-1-ene), and their structure has been confirmed. The optimal synthesis conditions have determined, and the product compounds have been to serve as efficient bactericides against sulfate-reducing bacteria.
Infrared and nuclear magnetic resonance spectroscopic studies of the structure and dynamics of allylic magnesium compounds
作者:E Alexander Hill、Winston A Boyd、Hemnalini Desai、Amir Darki、Lymel Bivens
DOI:10.1016/0022-328x(95)06014-n
日期:1996.5
streching bONds, corresponding to C CH2 and C CD2 groups in equilibrating allylic isomers. The methylene resonances in the 13C NMR spectra of allylmagnesium bromide and chloride and methallylmagnesium bromide are broadened at low temperatures by an exchange process which appears to be the interconversion between the classical unsymmetrical allytic structures. Analogous changes are seen in the spectrum
烯丙基-和甲基烯丙基-d 2-溴化镁的红外光谱具有两个双键拉伸键,对应于平衡烯丙基异构体中的CCH 2和C 2 CD 2基团。13中的亚甲基共振烯丙基溴化镁和氯化物以及甲基烯丙基溴化镁的13 C NMR光谱在低温下通过交换过程扩大,这似乎是经典不对称解析结构之间的相互转化。在1,3-二甲基烯丙基氯化镁的光谱和烯丙基溴化镁的质子NMR光谱中可以看到类似的变化。交换的速率常数和激活参数已从线宽确定。与格利雅试剂不同,二甲基镁在四氢呋喃中的亚甲基共振在降低的温度下不会显着加宽,并且氘代试剂在红外光谱中没有两个明显的双键拉伸带。
Influence of functional substitution of allyl halides on their ni(co)4 promoted carbonylative cycloaddition with acetylenes
作者:Francisco Camps、Josep M. Moreto、Lluis Pages
DOI:10.1016/s0040-4020(01)92256-2
日期:1992.4
were shown to favour competing side reactions such as allyl self-coupling. However, only cyclopentenones were obtained from either centrally or terminally substituted silylallyl halides. Substitution at both ends of the allyl moiety led to the formation of 4,5-disubstituted cyclopentenones. Important mechanistic information could be achieved from determination of the relative stereochemistry in these
Dynamic Stereochemistry of Terminally Substituted π-Allyl Complexes of Molybdenum with the Tp‘ Ligand: NMR Evidence for π−σ−π Interconversion
作者:Sanjoy K. Chowdhury、Malay Nandi、Vijaya S. Joshi、Amitabha Sarkar
DOI:10.1021/om960945i
日期:1997.4.1
NMR spectroscopic evidence is provided for a π−σ−π interconversion in fluxional, mono- and 1,3-disubstituted π-allyl molybdenumcomplexes containing the hydrotris(3,5-dimethylpyrazolyl)borateligand.