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氧代双-(N-甲基邻苯二甲酰亚胺)(简称OBI)是一种高附加值的精细有机产品,是合成3,3,’4,4-’二苯醚四甲酸二酐(简称单醚酐ODPA)的重要中间体。是以4-硝基-N-甲基-邻苯二甲酰亚胺为原料,选用新型相转移催化剂,以此提高产品OBI的收率。传统方法是以亚硝酸盐、碳酸盐或氟化钾、氟化钠等,在相转移催化剂季铵盐、季膦盐等存在下进行自缩合反应,收率在65%～75%之间。改进的工艺是在碳酸盐和新型相转移催化剂催化下,进行自缩合反应,合成氧代双-(N-甲基邻苯二甲酰亚胺),预期反应收率大于85%。
Oxybis- (N-methylphthalimide) (OBI) is a high value-added fine organic product, is the synthesis of 3,3 ’, 4,4’-diphenyl ether tetracarboxylic acid di An important intermediate of anhydride (abbreviated as monoethanolamine ODPA). Is based on 4-nitro-N-methyl-phthalimide as a raw material, the choice of a new type of phase transfer catalyst, thereby increasing the yield of the product OBI. The traditional method is nitrite, carbonate or potassium fluoride, sodium fluoride, etc., in the presence of the phase transfer catalyst quaternary ammonium salt, quaternary phosphonium salt and other self-condensation reaction, the yield was between 65% to 75% . The improved process is to synthesize oxobis- (N-methylphthalimide) under the catalysis of carbonate and novel phase transfer catalyst, and the expected reaction yield is more than 85%.