Highly efficient RuCl3-catalyzed disproportionation of (diacetoxyiodo)benzene to iodylbenzene and iodobenzene; leading to the efficient oxidation of alcohols to carbonyl compounds
作者:Mekhman S. Yusubov、Ki-Whan Chi、Joo Yeon Park、Rashad Karimov、Viktor V. Zhdankin
DOI:10.1016/j.tetlet.2006.06.100
日期:2006.8
(Diacetoxyiodo)benzene (DIB) selectively oxidizes primary and secondary alcohols to the respective carbonyl compounds in the presence of RuCl3 (0.8–1.0 mol %) at room temperature in aqueous acetonitrile. This reaction proceeds via an initial instantaneous Ru-catalyzed disproportionation of DIB to iodobenzene and iodylbenzene with the latter acting as the actual stoichiometric oxidant toward alcohols
Acid–base reactions of adamantanethione S -methylide and its spiro-1,3,4-thiadiazoline precursor
作者:Grzegorz Mloston、Rolf Huisgen
DOI:10.1016/s0040-4020(00)00988-1
日期:2001.1
The spiro-1,3,4-thiadiazoline 1 loses N2 at 45°C, and, as recently reported, the short-lived adamantanethione S-methylide (2) is an active 1,3-dipole. Interception of 2 by acids HX consists of CH2-protonation and ion recombination. Even 1 acts as HX vs 2 and—after electrocyclic ring opening of the anion (13 →15)—affords the dithioacetal C22H32N2S2 (14). The Δ3-thiadiazoline 1 is converted by base or
螺-1,3,4-噻二唑啉1在45°C时失去N 2,并且,最近报道,寿命短的金刚烷硫酮S-甲基化物(2)是活性的1,3-偶极子。酸HX对2的拦截由CH 2-质子化和离子重组组成。偶数1代表HX vs 2,并且在阴离子(13 → 15)经电环开环后,承担了二硫缩醛C 22 H 32 N 2 S 2(14)的作用。的Δ 3 -thiadiazoline 1通过碱或酸催化转化为Δ 2 -tautomer 21。氨基腙(25,26)从形成1点秒-胺。讨论了机理并阐明了结构。
Facile preparation and reactivity of bifunctional ionic liquid-supported hypervalent iodine reagent: a convenient recyclable reagent for catalytic oxidation
作者:Chenjie Zhu、Akira Yoshimura、Yunyang Wei、Victor N. Nemykin、Viktor V. Zhdankin
DOI:10.1016/j.tetlet.2012.01.053
日期:2012.3
efficient, and recyclable bifunctional catalysts bearing ionic liquid supported (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) and iodoarene moieties were developed and used for environmentally benign catalytic oxidation of alcohols. The reactions using peracetic acid as a green and practical co-oxidant afforded the corresponding carbonyl compounds in high yields under mild conditions and convenient work-up