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...
Into a 100 mL flask introduce 9 mL(0.1 mol)of aniline,15 mL glacial acetic acid,and 15 mL acetic anhydride.Note that heat is evolved owing to the reaction of acetic anhydride with aniline.Attach the flask to a reflux condenser and heat the solution ...
Into a 100 mL flask introduce 9 mL(0.1mol)of aniline,15 mL glacial aceticacid,and15 mL aceticanhydride.Notethat heat is evolved owing to the reaction of acetic anhydride withaniline.Attachthe flask to a reflux condenser and heat the solution to boil for 10minutes.Atthe end of thetime,cool...
Third, [3H]acetic anhydride frequently contains a nonvolatile, brownish contaminant that interferes with synthesis of [acetyl- 3 H]aspirin and may inhibit aspirin mediated acetylation of PGH synthase. The contaminant is removed by distillation, and therefore the [ 3 H]acetic anhydride must be ...
PROBLEM TO BE SOLVED: To provide a method for preparing esters without using expensive acetic anhydride as the acetylating agent, harmful and caustic sulfuric acid as a catalyst or expensive resin, and low in environmental load. ;SOLUTION: This method uses acetic acid as the acetylating agent ...
It is known that acrolein diacetate can be prepared by adding sulfuric acid to a mixture of acrolein and acetic anhydride (Wohl and Maag, Ber. 43, 3293, 1910). In this process a yield of 64 percent is reported. During the reaction,......
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...
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 ...
To convert the obtained monosaccharides into their acetylated aldon- onitriles, 0.5 mL pyridine and 10 mg hydroxylamine hydrochloride were added to the hydrolyzed products and incubated at 90 °C for 30 min in a preheated water bath shaker, 0.5 mL of acetic anhydride was ...
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 ...