7-OXO-7H-dibenzo-[d e,h]-quinolin-2-ol which is useful as an intermediate in the preparation of dyestuffs is prepared by cycloisomerizing the novel compound, N-phenylacetyl phthalimide in an inert solvent and in the presence of a Friedel-Crafts catalyst to form the novel compound O-(3-hydroxy-1-isoquinolinyl)-benzoic acid which is then cyclized by dehydrating condensation to form the 7-oxo-7H-dibenzo-[d e,h]-quinolin-2-ol.
用于
染料制备中间体的7-OXO-7H-dibenzo-[d e,h]-quinolin-2-ol是通过在惰性溶剂中,在Friedel-Crafts催化剂的存在下,将新化合物N-苯乙酰邻苯二甲
酰亚胺环化制备而成。然后,通过脱
水缩合将新化合物O-(3-羟基-1-
异喹啉基)-
苯甲酸环化,形成7-氧代-7H-二苯并[d e,h]-
喹啉-2-
酚。