[EN] SYNTHESIS OF GLYCOLS VIA TRANSFER HYDROGENATION OF ALPHA-FUNCTIONAL ESTERS WITH ALCOHOLS<br/>[FR] SYNTHÈSE DE GLYCOLS AU MOYEN D'UNE HYDROGÉNATION PAR TRANSFERT D'ESTERS ALPHA-FONCTIONNELS AVEC DES ALCOOLS
申请人:EASTMAN CHEM CO
公开号:WO2019027948A1
公开(公告)日:2019-02-07
A transfer hydrogenation process for forming vicinal diols by hydrogenating 1,2-dioxygenated organic compounds using alcohols as the reducing agent instead of the traditional H2 gas. The transfer hydrogenation is carried out under milder conditions of temperature and pressure than is typical for ester hydrogenation with H2. The milder conditions of operation provide benefits, such as lower operating and capital costs for industrial scale production as well as savings in product purification due to the avoidance of by-products from exposure of reaction mixtures and products to high temperatures.
effects of ethylene glycol-derived alcohols/hemiacetals on inhibiting oxidation catalysts. Herein, using a CuCl/tetramethylethylenediamine/1,5-dimethyl-9-azanoradamantane N-oxyl catalyst, we describe a highlyefficient aerobic oxidative esterification reaction of ethylene glycol to various oxalic acid diesters via selective oxidation of ethylene glycol-derived alcohols/hemiacetals even in the presence
理想的绿色酯化反应之一是需氧氧化酯化反应,该反应仅使用化学计量的不同醇,通过分子间选择性醇氧化,然后通过将其他醇和半缩醛氧化加入酯形成半缩醛。然而,迄今为止尚未报道通过氧化酯化合成草酸二酯,这可能是由于分子间醇氧化的选择性控制困难以及乙二醇衍生的醇/半缩醛对抑制氧化催化剂的螯合作用。在此,使用 CuCl/四甲基乙二胺/1,5-二甲基-9-氮杂金刚烷N-oxyl 催化剂,我们描述了即使在其他脂肪族伯醇存在下,通过乙二醇衍生的醇/半缩醛的选择性氧化,乙二醇对各种草酸二酯的高效好氧氧化酯化反应。值得注意的是,使用乙二醇和伯/仲醇的理想化学计量比,绿色反应效果很好。彻底的实验研究和理论计算表明,高选择性的氧化酯化是通过乙二醇衍生的醇/半缩醛与 Cu( II ) 物种的优先双齿配位实现的,然后是有效的双电子/单质子转移。
Hypoiodite reaction: the decomposition of oxalic acid half-esters
作者:K. Bartel、A. Goosen、A. Scheffer
DOI:10.1039/j39710003766
日期:——
Alkyl half-esters of oxalicacid photolysed with mercury(II) oxide–iodine reagent gave mainly dialkyl oxalates. 1-Apocamphyl hydrogen oxalate gave, in addition to the diester, 1-apocamphyl iodide. 9-Triptycyl hydrogen oxalate gave 9-triptycyl iodoformate, which was thermally decomposed to 9-iodotriptycene and with silver tetrafluoroborate gave 9-triptycyl fluoroformate. We suggest that diester formation
Thermal decomposition of oxalate diesters in the presence of iodine
作者:A. Goosen、A. Scheffer
DOI:10.1039/p19720000369
日期:——
Dialkyl oxalatesdecomposed in the presence of iodine at temperatures at which the pure diesters were stable. Dioctadecanyl, dicyclohexyl, and di-1-adamantyl oxalate gave the corresponding iodides, whereas dibenzyl oxalate gave diphenylmethane. The mechanism of the iodine-induced decomposition of dialkyl oxalates is discussed.
"Smoke-suppressant polyhalocarbon polymer compositions containing as
申请人:Armstrong Cork Company
公开号:US04085081A1
公开(公告)日:1978-04-18
Smoke-suppressant polymer compositions are described comprising a polyhalocarbon resin and an organic ester of the formula (a) ROC(O)C(O)OR' wherein R and R' can be the same or different and are C.sub.1 to C.sub.8 alkyl, C.sub.6 to C.sub.12 cycloalkyl or C.sub.1 to C.sub.8 alkoxy-substituted C.sub.1 to C.sub.8 alkyl; (b) RC(CH.sub.2 O).sub.3 (CH.sub.2 CH.dbd.CH.sub.2).sub.3-x (C(O)CH.sub.3).sub.3-y wherein R is defined above and x and y are 1 or 2 with the proviso that x .noteq. y; (c) [CH.sub.3 C(O)CH.sub.2 CH.sub.2 C(O)O].sub.x R" wherein x is defined above and R" is C.sub.1 to C.sub.8 alkyl, C.sub.6 to C.sub.12 cycloalkyl, C.sub.1 to C.sub.8 alkoxy-substituted alkyl, C.sub.2 to C.sub.8 alkylene or C.sub.2 to C.sub.8 oxyalkylene; or (d) mixtures thereof.