Acetic anhydride-mediated cyclization of amino acids (125; X = H, Cl) affords dibenzothiazocinones (99; R = H) and (108) in ca. 80% yield 〈74CCC333〉. Conversion of (125; X = Cl) to the trimethylsilyl ester, followed by treatment with tosyl chloride, affords the corresponding N-...
The amine groups of PEI on the surface of MWCNTs were then reacted with acetic anhydride or succinic anhydride to form MWCNTs with neutral or negative ... M Shen,HW Su,X Shi,... - 《Journal of Physical Chemistry C》 被引量: 248发表: 2009年 Reactions of ethyleneimine with guanosine and...
Acetic anhydride is produced by the thermal decomposition of acetic acid vapour in presence of metaphosphoric acid produced by the decomposition of phosphates of volatilizable bases such as ammonium, hydrazine, hydroxylamine, methylamines, ethylamines, cyclohexylamine, and pyridine. A small quantity of ...
The α-mercapto-p-biphenylylacetic acid may also be reacted with succinic anhydride, maleic anhydride or phthalic anhydride to form the corresponding derivative. ##SPC30## The α-loweralkylmercapto-p-biphenylylacetic acid may further be oxidized to the loweralkylsulfinyl and loweralkylsulfonyl ...
methylamine 2-imino-4-oxo-thiazolidine-3-carboxylic acid amide furan-2,3,5(4H)-trione pyridine (1:1) 68-11-1 mercaptoacetic acid 39130-96-6 thiazolidine-2,4-dione-2-semicarbazone furan-2,3,5(4H)-trione pyridine (1:1) 68-11-1 mercaptoacetic acid (1,4,5,6-tetrahy...
The above compound (0.5 mole) is stirred overnight at room temperature in pyridine (200 ml., with acetic anhydride (0.55 mole). The solution is evaporated to dryness at 5° C, dissolved in dichloromethane (600 ml.) and extracted with 2.5 N hydrochloric acid (6 × 200 ml.), water (12...
Conversion to the lactone may be performed in a simple manner by reaction with acids, if desired in the presence of water-withdrawing agents such as e.g. acetic anhydride or thionyl chloride, or under other conditions that will remove water such as e.g. azeotropic distillation of water. ...
Suitable acid anhydrides, which are employed preferably in an equivalent molar ratio, are, for example, acetic anhydride, benzoic acid anhydride, and phthalic acid anhydride. It is also possible to utilize acetyl bromide. The hydrolysis of the acetals with an aqueous NaHSO3 solution results, by ...