Abstract
It was found that equimolecular reaction of 2- (4'-diethyl-amino-2'-hydroxybenzoyl) benzoic acid (DHBB) and 4-hydroxy-N-methyldiphenylamine (HMDA) gave not only 3-diethylamino-7- (N-methylanilino) fluorane (1) but also a bis-lactone compound (2) which was given by further reaction of (1) with DHBB. The chemical structure of this bis-lactone compound (2) was determined and this was synthesized in good yield from 2 moles of DHBB and 1 mole of HMDA. Several compounds having the bis-lactone structure were synthesized and some of them were found to be useful in industrial application, such as pressure or heat sensitive copying paper.
