| 摘要 |
1,216,294. Acetylated diamines. FMC CORP. 11 March, 1969 [13 March, 1968], No. 12809/69. Heading C2C. A process for the production of tetraacetylated diamines of the formula wherein R is an aliphatic hydrocarbon radical having 1 to 3 carbon atoms between the flanking nitrogen atoms and which may be substituted by aliphatic or cycloaliphatic groups having up to 16 carbon atoms or by phenyl or substituted phenyl groups or R is a phenylene or substituted phenylene group, comprises reacting ketene with either or with where R<SP>1</SP> represents the same groups as R but must have at least two carbon atoms between the two nitrogen atoms, in the presence of a catalytic amount of phosphoric acid, preferably orthophosphoric acid at a temperature of 40‹ C. to 100‹ C.; preferably sulphur or a sulphur compound e.g. phenothiazine or methyl-thio-mcresol is present as an auxiliary catalyst. Examples describe the preparation of compounds wherein R = -CH 2 -; -CH 2 -CH 2 -; -CH-; -CH-; p-phenylene. CH 3 Ph Reference has been directed by the Comptroller to Specification 907,357. |
