申请人:Xerox Corporation
公开号:US06576747B1
公开(公告)日:2003-06-10
Disclosed is a process for preparing dianthranilate compounds which comprises (a) admixing reactants as follows: (1) a diol of the formula R1(OH)2, wherein R1 is an alkylene group having at least about 20 carbon atoms, and wherein the —OH groups are primary or secondary, (2) isatoic anhydride, present in an amount of at least, about 2 moles of isatoic anhydride per every one mole of diol, (3) a catalyst which is 1,4-diazabicyclo [2.2.2]octane, N,N,N′,N′-tetramethylethylene diamine, or a mixture thereof, said catalyst being present in an amount of at least about 0.2 mole of catalyst per every one mole of diol, and (4) a solvent; and (b) heating the mixture thus formed to form a dianthranilate compound of the formula
Also disclosed is a process for preparing diazopyridone colorants which comprises (I) preparing a dianthranilate compound by the aforementioned method, (II) reacting the dianthranilate compound with nitrosylsulfuric acid to form a diazonium salt, and (III) reacting the, diazonium salt with a pyridone compound to form a diazopyridone compound.
本发明揭示了一种制备二芳酰氨化合物的方法,包括(a)混合以下反应物:(1)式为R1(OH)2的二元醇,其中R1是至少具有约20个碳原子的烷基基团,且—OH基团为一级或二级,(2)异香草酸酐,其量至少为每摩尔二元醇2摩尔的量,(3)催化剂,该催化剂为1,4-二氮杂双环[2.2.2]辛烷,N,N,N′,N′-四甲基乙二胺或它们的混合物,催化剂的量至少为每摩尔二元醇0.2摩尔的量,以及(4)溶剂;(b)加热所形成的混合物,以形成式为的二芳酰氨化合物。本发明还揭示了一种制备二氮杂吡咯酮染料的方法,包括(I)通过上述方法制备二芳酰氨化合物,(II)将二芳酰氨化合物与硝酰硫酸反应形成重氮盐,以及(III)将重氮盐与吡咯酮化合物反应形成二氮杂吡咯酮化合物。