A Simple, Mild and General Oxidation of Alcohols to Aldehydes or Ketones by SO
<sub>2</sub>
F
<sub>2</sub>
/K
<sub>2</sub>
CO
<sub>3</sub>
Using DMSO as Solvent and Oxidant
作者:Gao‐Feng Zha、Wan‐Yin Fang、Jing Leng、Hua‐Li Qin
DOI:10.1002/adsc.201900104
日期:2019.5.14
A practical, general and mild oxidation of primary and secondary alcohols to carbonyl compounds proceeds in yields of up to 99% using SO2F2 as electrophile in DMSO as both the oxidant and the solvent at ambient temperature. No moisture‐ and oxygen‐free conditions are required. Stoichiometric amount of inexpensive K2CO3, which generates easy to separate by‐products, is used as the base. Thus, 5‐gram
在环境温度下,使用SO 2 F 2作为亲电子试剂在DMSO中作为氧化剂和溶剂,伯醇和仲醇进行实用,通用且温和的氧化成羰基化合物的收率可达99%。不需要无湿气和无氧条件。化学计量的廉价K 2 CO 3生成易于分离的副产物的油基用作基础。因此,通过简单的过滤作为后处理,以几乎定量的产量进行了5克规模的运行。还应注意使用通常促进竞争的Pummerer重排的极性溶剂(例如DMSO)。该协议与(杂)芳烃,烯烃和炔烃底物上的各种常见的N-,O-和S-官能团兼容(68个例子)。该方案被应用(99%的产率)用于重要的降胆固醇药物瑞舒伐他汀的正式合成。
An efficient dehydroxymethylation reaction by a palladium catalyst
作者:Atanu Modak、Togati Naveen、Debabrata Maiti
DOI:10.1039/c2cc36951f
日期:——
A general method for selective dehydroxymethylation has been discovered by using widely available Pd(OAc)(2). The present study offers a new synthetic strategy for the regioselective functionalization by employing the steric, electronic and coordinating nature of the hydroxymethyl (-CH(2)OH) group temporarily.
Terpenoids Biotransformation in Mammals III: Biotransformation of α-Pinene, β-Pinene, Pinane, 3-Carene, Carane, Myrcene, and p-Cymene in Rabbits
作者:T. Ishidax、Y. Asakawa、T. Takemoto、T. Aratani
DOI:10.1002/jps.2600700417
日期:1981.4
The biotransformation of (+)-, (-)-, and (+-)-alpha-pinenes, (-)-beta-pinene (nopinene), (-)-cis-pinane, (+)-3-carene, (-)-cis-carane, myrcene, and p-cymene in rabbits was investigated. The major metabolites were as follows: (-)-trans-verbenol from (+)-, (-)-, and (+/-)-alpha-pinenes; (-)-10-pinanol and (-)-1-p-menthene-7,8-diol from (-)-beta-pinene; (-)-alpha-terpineol and (-)-trans-sobrerol from
Zirconia-supported Keggin phosphomolybdovanadate nanocomposite: A heterogeneous and reusable catalyst for alkene epoxidation under thermal and ultrasonic irradiation conditions
Résumé Keggin phosphomolybdovanadate, PVMo, was supported on a zirconia matrix by the wet impregnation method. The phase and chemical structure, optical absorption, surface physicochemical properties and morphology of PVMo–ZrO2 composite were studied by X-ray diffraction (XRD) technique, FT-IR and diffuse reflectance UV–vis spectroscopic (DR UV–vis) methods, and scanning electron microscopy (SEM), which indicated that the primary Keggin structure has remained intact after formation of the composite. Moreover, the obtained nanocomposite was used as an efficient catalyst of olefins under reflux and ultrasonic irradiation conditions. The catalyst was reused several times, without observable loss of activity and selectivity. Indeed, the catalytic activity of the PVMo–ZrO2 was compared with pure Keggin phosphomolybdovanadate.
Synthesis and characterization of supported heteropolymolybdate nanoparticles between silicate layers of Bentonite with enhanced catalytic activity for epoxidation of alkenes
作者:Hossein Salavati、Nahid Rasouli
DOI:10.1016/j.materresbull.2011.07.037
日期:2011.11
electron microscopy analysis indicated that PVMo was finely dispersed into layers of bentonite as support. The PVMo/Bentonite used as an efficient heterogeneous catalyst for epoxidation of alkenes. Various cyclic and linear alkenes were oxidized into the corresponding epoxides in high yields and selectivity with 30% aqueous H2O2. The catalyst was reused several times, without observable loss of activity