申请人:Occidental Chemical Corporation
公开号:US04517372A1
公开(公告)日:1985-05-14
This invention relates to a process for the preparation of 4-fluorophthalic anhydride which comprises contacting a dihalohexahydrophthalic anhydride of the formula ##STR1## where X is Cl or F, with a dehydrogenation catalyst. Advantageously, the process of the invention may be carried out in the presence of a hydrogen acceptor. The preferred hydrogen acceptor is a halocarbon hydrogen acceptor of the formula ##STR2## where Y is Cl, Br, or I; Z is Cl, Br or I; m is 0 to 4, n is 0 to 3, p is 0 to 3, and m+n is at least 1; with the proviso that when m is 0, p is at least 1.
本发明涉及一种制备4-氟邻苯二酐的方法,该方法包括将式为##STR1##的二卤代六环邻苯二酐与脱氢催化剂接触。有利地,本发明的方法可以在氢受体的存在下进行。首选的氢受体是式为##STR2##的卤代碳氢受体,其中Y为Cl、Br或I;Z为Cl、Br或I;m为0至4,n为0至3,p为0至3,且m+n至少为1;但当m为0时,p至少为1。