| 摘要 |
<p>1. Process for the preparation of products of formula (I): comprising reacting a reactant of formula (II): with ammonia at a temperature of between 180 and 270 degree C. 2. Process for the preparation of products of formula (I): comprising reacting a reactant of formula (II): with ammonia in the presence of an alkali metal halide and at a temperature of between 180 and 270 degree C. 3. Process according to claim 2, in which the alkali metal halide is present in a catalytic amount. 4. Process according to claim 2, in which the alkali metal halide is present in an mount of between 1 and 50%, preferably between 5 and 20% of the molar amount of reactant of formula (II). 5. Process according to any one of claims 1-4, in which the content of water in the reaction mixture is such that the H2O/NH3 ratio is less than 80/100, preferably is less than 20/100 more preferably is less than 2/100. 6. Process according to any one of claims 1-5, in which the polar-organic solvent is employed, preferably nonionic polar-organic solvent. 7. Process according to any one of claims 1-6, in which the solvent employed is an N-alkylpyrrolidone, the alkyl-radical of which has 1-12 carbon atoms, more preferably N-methylpyrrolidone.</p> |
