Selective mixed coupling of carboxylic acids (II). — photolysis of unsymmetrical diacylperoxides with alkenyl-, halo-, keto-, carboxyl-groups and a chiral α-carbon. Comparison with the mixed kolbe electrolysis
作者:Michael Feldhues、Hans J. Schäfer
DOI:10.1016/s0040-4020(01)97195-9
日期:1985.1
cholanoyl or 3- and 4-carboxyalkanoyl peroxides can be coupled (40 – 70 %). The α-chiral diacyl peroxide ls undergoes the photochemical coupling reaction with 80 % retention of its configuration. The photolysis of diacyl peroxides at −78° C proves to be a favorable supplement of the Kolbe-electrolysis in cases, where the electrolysis fails or produces low yields.
Alkyl phenyl tellurides reacted with chloramine-T in refluxing tetrahydrofuran to give olefins in high yields.
烷基苯基碲化物与氯胺-T 在回流的四氢呋喃中反应,以高产率得到烯烃。
Structure and Reactivity of Al−O(H)−Al Moieties in Siloxide Frameworks: Solution and Gas-Phase Model Studies
作者:Kapil Shyam Lokare、Beatrice Braun-Cula、Christian Limberg、Marcel Jorewitz、John T. Kelly、Knut R. Asmis、Stephen Leach、Carsten Baldauf、Itziar Goikoetxea、Joachim Sauer
DOI:10.1002/anie.201810130
日期:2019.1.14
spectroscopy on solvent‐free and deprotonated 1 show that the six‐membered ring structure of its Al3(μ2‐OH)3 core is unstable with respect to deprotonation of one of its hydroxy groups and rearranges into two edge‐sharing four‐membered rings. This renders AlIV−O(H)−AlIV units strong acid sites, and all results together suggest that their acidity is similar to that of zeolitic SiIV−O(H)−AlIV groups.
尽管氧化铝和铝硅酸盐已得到广泛应用,但对其表面异质性和由羟基化/脱羟基化引起的缺陷行为的一致分子理解仍不清楚。在这里,我们研究了良好限定的分子模型化合物,[铝3(μ 2 -OH)3(THF)3(PHSI(OSiPh 2 O)3)2 ],1,以深入了解的酸-碱反应环状三核的Al 3(μ 2 -OH)3原子级的部分。我们发现,与沸石一样,它们具有足够的酸性以催化烯烃的异构化。DFT和气相上振动光谱无溶剂和去质子化1表明,其Al的六元环结构3(μ 2 -OH)3核心是不稳定的相对于它的羟基和重新排列中的一个的去质子化成两个边缘共享四元环。这使得Al IV -O(H)-Al IV单元具有强酸位,所有结果共同表明它们的酸度与沸石Si IV -O(H)-Al IV基团的酸度相似。
Integrated Chemical Process. One-Pot Preparation of Olefins by Alkylation and Desulfonylation
作者:Akihiro Orita、Akihiro Watanabe、Junzo Otera
DOI:10.1246/cl.1997.1025
日期:1997.10
Integration of alkylation of allylic sulfone and reductive desulfonylation under basic conditions effects one-pot synthesis of various olefins.
在碱性条件下,烷基化反应与还原脱磺基反应的集成,影响了一锅法合成多种烯烃。
Uemura, Sakae; Fukuzawa, Shin-ichi, Journal of the Chemical Society. Perkin transactions I, 1985, p. 471 - 480