公开(公告)号：US06191305B1

公开(公告)日：2001-02-20

申请号：US09418654

申请日：1999-10-15

申请人： Akira Ishikawa ,  Hiroto Mitsui ,  Kiyotaka Akao ,  Norihisa Komoda

发明人： Akira Ishikawa ,  Hiroto Mitsui ,  Kiyotaka Akao ,  Norihisa Komoda

IPC分类号： C07C6976

CPC分类号： C07C67/343 ,  C07C69/76

摘要： A tetraester of 3,3′,4,4′-biphenyltetracarboxylic acid is advantageously prepared by a process composed of a step of dimerizing an o-phthalic diester in the presence of a catalyst comprising a powdery palladium salt having a specific surface area of at least 0.5 m2/g and a basic bidentate ligand compound and one or more steps of continuing the dimerization after supplemental addition of at least one of the powdery palladium salt and the basic bidentate ligand compound.

摘要翻译： 3,3'，4,4'-联苯四羧酸的四酯有利地通过在催化剂存在下将邻苯二甲酸二酯进行二聚的方法制备，所述催化剂包含比表面积为 至少0.5m2 / g和碱性二齿配位体化合物，以及一种或多种步骤，在补充加入至少一种粉状钯盐和碱性二齿配体化合物之后继续进行二聚。