PURPOSE:To obtain acetic anhydride from methyl acetate or dimethyl ether and CO, by using Ni or a Ni compound and a halide of Br or I as a catalyst and a specific metal such as Sn, Li or its compound as a cocatalyst. CONSTITUTION:In preparing acetic anhydride by reacting methyl acetate...
1468940 Carboxylic acid anhydrides HALCON INTERNATIONAL Inc 3 Sept 1974 [4 Sept 1973 8 May 1974] 38511/74 Heading C2C An anhydride of a monocarboxylic acid is prepared by reacting a carboxylic ester RCOOR (Reaction I) or an ether ROR (Reaction II) with an acyl halide RCOX under substantially...
Inventors hydroxy cinnamic acid and sulfonamides as raw material, hydroxy cinnamic acid in acetic anhydride, followed by addition of pyridine, tetrahydrofuran and the sulfa drug reactions to obtain an amide compound crude, filtered, washed and re-crystallization process to give a new class of ...
s procedure for rotaxane synthesis30.Racemic1awas treated with 0.9 equivalents of acetic anhydride in the presence of 0.5 equivalents of the catalyst and 1.7 equivalents of collidine as an auxiliary base in CHCl3at −60 °C at a substrate concentration of 0.07 M (Table1, entries 1–4...
To a solution of 50 gm (0.13 mol) of ergosterol (1) in 300 ml of anhydrous pyridine was added 33.3 ml (0.35 mol) of acetic anhydride. The mixture was stirred at room temperature overnight and then 600 ml of water was added. The precipitate was filtered and washed three times with 200...
nitrilation of amide group has novelty. Examples of the dehydrating agent in the form of liquid are, for instance, acetic anhydride, trifluoroacetic anhydride, ClCO2C2H5, and the like. Particularly trifluoroacetic anhydride is preferable from the viewpoint of a yield. As case demands, an acid ...
A DOTA derivative that contains an anhydride group was readily synthesized by reacting DOTAGA with acetic anhydride and its reactivity was investigated. Opening the anhydride with propylamine led to the selective formation of one of two possible regioisomers. The structure of the obtained isomer was ...
the optimal process conditions of acetylated corn starch are as follows: pH value is 9,reaction temperature is 25 ℃,reaction time is 60 min,addition of acetic anhydride is 10%.Acid hydrolysis acetylated modified starch is prepared according to the above optimal process conditions of acid ...
The present invention discloses a method for preparing moxifloxacin hydrochloride cleaning method which employs heating boric acid and acetic anhydride produced by the reaction B (OAc) 3, B (OAc) 3 and 1-cyclopropyl-6,7-difluoro-1 , 4-dihydro-8-methoxy-4-oxo-3-quinolinecarboxylic acid was ...
After dissolving the (E)-1-amino-benzaldehyde O-benzoyloxime (0.2 g, 0.83 mmol) obtained from Example 12 in acetic anhydride (10 ml), H2SO4(0.1 ml, catalystic amount) was added. After stirring reaction solution for 6 hours, water was added and the reaction solution was extracted with di...