Visible-light-promoted conversion of alkyl benzyl ether to alkyl ester or alcohol via O-α-sp3 C-H cleavage
A mild and high-yielding visible-light-promoted conversion of alkyl benzyl ethers to the alkyl esters or alkyl alcohols was developed. Mechanistic studies provided evidence for a radical chain reaction involving the homolytic cleavage of O-α-sp3 C-H bonds in the substrate as one of the propagation steps. We propose that α-bromoethers are key intermediates in the transformation.
Lu, Ping,Hou, Tianyuan,Gu, Xiangyong,Li, Pixu
p. 1954 - 1957
(2015/04/27)
Simple method for the preparation of esters from Grignard reagents and alkyl 1-imidazolecarboxylates
The reaction of Grignard reagents with alkyl imidazolecarboxylates, which were prepared from alcohols with carbonyl diimidazole, gave the corresponding esters in good to excellent yields. This method conveniently provides esters from alkyl halides and alcohols by C1-carbon chain extension.
Werner, Thomas,Barrett, Anthony G. M.
p. 4302 - 4304
(2007/10/03)
A new method for the esterification of carboxylic acids with various alcohols by using di-2-thienyl carbonate, a new coupling reagent
Esterification of carboxylic acids with alcohols by using di-2-thienyl carbonate in the presence of a catalytic amount of 4-(dimethylamino)pyridine (DMAP) proceeded smoothly under mild conditions to afford the corresponding esters and 2(5H)-thiophenone in good to high yields.
Efficient method for the esterification of carboxylic acids with alcohols using di-2-thienyl carbonate promoted by DMAP and iodine
Reaction of carboxylic acids with alcohols by using an equimolar amount of di-2-thienyl carbonate (2-DTC) in the presence of a catalytic amount of 4-(dimethylamino)pyridine (DMAP) followed by addition of an equimolar amount of iodine proceeded smoothly to afford the corresponding esters and 2(5H)-thiophenone in good to high yields.
An Efficient Esterification Reaction between Equimolar Amounts of Free Carboxylic Acids and Alcohols by the Combined Use of Octamethylcyclotetrasiloxane and a Catalytic Amount of Titanium(IV) Chloride Tris(trifluoromethanesulfonate)
Various carboxylic esters are prepared in good to high yields from equimolar amounts of free carboxylic acids and alcohols by the combined use of octamethylcyclotetrasiloxane and a catalytic amount of TiCl(OTf)3.
Izumi, Jun,Shiina, Isamu,Mukaiyama, Teruaki
p. 141 - 142
(2007/10/02)
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