Abstract:
L'invention concerne un procédé de conversion alimenté par une charge diol comprenant au moins 90% poids de diol et une charge acide carboxylique comprenant au moins 80% poids d'acide carboxylique, ledit procédé comprenant au moins : - une étape d'estérification, alimentée par au moins ladite charge diol et au moins ladite charge acide carboxylique, les débits d'alimentation étant ajustés de telle sorte que le ratio molaire acide carboxylique/diol en entrée de ladite étape d'estérification est compris entre 2 et 6, ladite étape d'estérification comprenant au moins une colonne de distillation réactive opérée à une température comprise entre 40 et 280°C, à une pression comprise entre 0,01 et 0,5 MPa, avec un taux de reflux molaire compris entre 0,5 et 10 et un taux de rebouillage molaire compris entre 0,5 et 10, constituée d'une zone mixte de réaction/séparation située entre deux zones de séparation, chacune desdites zones de séparation ayant une efficacité d'au moins deux étages théoriques, ladite zone mixte comprenant un catalyseur hétérogène acide, ladite étape d'estérification produisant au moins un distillat comprenant de l'eau et un résidu diester de diol; - une étape d'élimination de l'eau alimentée par ledit distillat comprenant de l'eau et produisant au moins un effluent eau.
Abstract:
Higher diamondoid derivatives capable of taking part in polymerization reactions are disclosed as are intermediates to these derivatives, polymers formed from these derivatives and methods for preparing the polymers.
Abstract:
The present invention is directed to a procedure for making an enantiomerically enriched compound containing a hydronaphthalene ring structure. The process involves reacting oxabenzonorbornadienes with nucleophiles using rhodium as a catalyst and in the presence of a phosphine ligand. The compounds synthesized may be used in pharmaceutical preparations for the treatment of a variety of diseases and conditions.
Abstract:
A process is disclosed for the catalytic addition of nucleophilic agents to alkines or allenes to form alkenes that are substituted by the nucleophile and where required undergo further reaction and/or isomerisation with the nucleophile. The catalyst used is a monovalent gold complex which is present at least in part in ionised form.
Abstract:
A process for preparing monoesters comprises the step of reacting at least one diol with at least one carboxylic acid in a biphasic solvent system, the carboxylic acid being sufficiently water soluble to allow esterification to occur, and the biphasic solvent system comprising water and at least one aprotic solvent in which the resulting monoester has greater solubility than in water.
Abstract:
Un procedimiento para la conversión de aldehidos que comprende poner en contacto un aldehido con agua oxigenada y con un catalizador, en condiciones de oxidación, caracterizado porque el catalizador es un tamiz molecular con poros de un diámetro de al menos 0,52 nm y tiene una fórmula empírica en forma calcinada y deshidratada de (Sn x Ti y Si 1-x-y-z Ge z )O 2 donde x es una fracción molar del estaño y tiene un valor entre 0,001 y 0,1; y es una fracción molar de titanio y tiene un valor de cero a 0,1; y z es la fracción molar del germanio y tiene un valor de cero a 0,08.
Abstract translation:本发明涉及一种醛转化方法,其包括在氧化条件下使醛与氧化水和催化剂接触。 本发明的方法的特征在于催化剂是包含直径至少为0.52nm的孔的分子筛和煅烧和脱水形式的(Sn x Ti y Si 1-xy-z Ge z)O 2的经验式,其中x是 锡的值在0.001和0.1之间,y是0.1的零值的钛的摩尔分数,z是在0.08的零值的锗的摩尔分数。
Abstract:
Higher diamondoid derivatives capable of taking part in polymerization reactions are disclosed as are intermediates to these derivatives, polymers formed from these derivatives and methods for preparing the polymers.
Abstract:
1,3-Propanediol esters, preferably diesters, can be made using a modified Prins reaction by reacting ethylene, formaldehyde, and a carboxylic acid using a selected perfluoroalkylsulfonate or perfluorocarboxylate as a catalyst. Improved Prins reactions to make esters using formic acid as a carboxylic acid are also disclosed. The esters are useful as monomers and chemical intermediates.
Abstract:
The invention relates to a method for producing vicinal diols or polyols from an organic reaction mixture containing formic acid esters of vicinal diols or polyols. The reaction mixture is treated with water without adding bases and thermally treated afterwards, whereby the formic acid esters are hydrolyzed, the aqueous formic acid is separated and the vicinal diols or polyols remain.