摘要:
A process is described for preparing 2,2,6,6-tetramethylpiperidine-N-oxyl and its 4-position substituted derivatives by oxidation of 2,2,6,6-tetramethylpiperidine and its 4-position substituted derivatives in the presence of hydrogen peroxide and low concentrations of divalent metal salts.
摘要:
The present invention relates to a method for the production of substituted or unsubstituted chloromethyl and bromomethyl cyclopropane having a degree of purity above 85%, particularly above 90%, by reacting a hydroxymethyl cyclopropane of the formula ##STR1## where R is H, or one or two R groups are alkyl of from 1 to 10 carbon atoms or phenyl, with methane sulfonic acid chloride or methane sulfonic acid bromide in the presence of a trialkylamine and, if necessary, an organic solvent, preferably an organic solvent containing oxygen, at a temperature of from -20.degree. C. to +30.degree. C. over a period of time of from 1 to 30 hours, then heating the reaction mixture to a temperature of from 40.degree. to 80.degree. C., or to reflux temperature, without isolating the intermediate mesylate.
摘要翻译:本发明涉及一种制备取代或未取代的氯甲基和溴甲基环丙烷的方法,其通过使式(* CHEMICAL STRUCTURE *)的羟甲基环丙烷与R为H的化合物反应,其纯度高于85%,特别是高于90% ,或一个或两个R基团是具有1至10个碳原子的烷基或苯基,与甲烷磺酰氯或甲磺酸溴化物在三烷基胺存在下反应,如有必要,有机溶剂,优选含有氧的有机溶剂 在-20℃至+ 30℃的温度下,在1至30小时的时间内,然后将反应混合物加热至40℃至80℃的温度或回流 温度,而不分离甲磺酸中间体。
摘要:
An improvement in a process for the industrial application of the Knoevenagel synthesis in an acid solution, resulting in a steady flow of waste gas.
摘要:
For the production of chlorine-free cyclopropanecarboxylic acid esters, gamma-butyrolactone and butanol are reacted, in a first step, with hydrogen chloride in the absence of a catalyst at a temperature of 120.degree.-140.degree. C., the resultant gamma-chlorobutyric acid butyl ester is cyclized at 100.degree.-200.degree. C. with a solution of a sodium alcoholate in the corresponding alcohol of 4 or more carbon atoms and this product is optionally interestified in a third step with a higher-boiling alcohol of more than 4 carbon atoms. The second and third steps can be performed in one step, if desired.
摘要:
2-Methoxyethyl cyclododec-1-enyl ether is of interest as a precursor for the saturated ether, 2-methoxyethyl cyclododecyl ether, which can be obtained therefrom by catalytic hydrogenation, in a high purity and with a good fragrance quality. The saturated ether is a valuable fragrance component having a woody note. A process for producing 2-methylethyl cyclododec-1-enyl ether comprises the step of reacting cyclododecanone, 2-methoxyethanol and a tri(lower alkyl) orthoformate, at a temperature of 50.degree.-250.degree. C., in the presence of an acid catalyst, removing resultant low-boiling compounds by distillation, and recovering resultant 2-methoxyethyl cyclododec-1-enyl ether.