60948-91-6Relevant articles and documents
Method for preparing Guerbet acids by taking malonate as raw material
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Paragraph 0034, (2017/08/29)
The invention discloses a method for preparing Guerbet acids by taking malonate as a raw material. The method comprises the following steps: using the malonate as the raw material, and carrying out alkylation reaction under the action of alkali to obtain dialkyl malonate; sequentially carrying out hydrolysis reaction and decarboxylic reaction on obtained dialkyl malonate to obtain the Guerbet acid, wherein the malonate is dimethyl malonate or diethyl malonate; the alkali of the alkylation reaction is selected from one or more of potassium carbonate, sodium hydroxide, potassium hydroxide, sodium methylate and sodium ethoxide; an alkylating reagent is haloalkane with 2 to 20 carbons. According to the method disclosed by the invention, the Guerbet acids are prepared by taking the malonate as the raw material for the first time; related three reactions are easily operated, high temperature or high pressure is not needed, and high yield is realized; by means of the alkylation reaction disclosed by the invention, a main chain structure and a branched chain structure of the Guerbet acids can be flexibly regulated and controlled, and further the Guerbet acids with different properties are obtained.
Use of ethyl (benzothiazol-2-ylsulfonyl)acetate for malonic ester-type syntheses of carboxylic acids and esters
Hussein, Waleed M.,McGeary, Ross P.
, p. 1222 - 1227 (2014/10/16)
A new methodology for the synthesis of substituted carboxylic acids is described. Alkylation of either ethyl (benzothiazol-2-ylsulfonyl)acetate or ethyl 2-(benzothiazol-2-ylsulfonyl)propionate was achieved with alkyl halides and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in dichloromethane solution. These products were then desulfinated and hydrolysed in one-pot under mild conditions to give substituted acetic acids in good-to-excellent yields.