Nippon Shokubai Kagaku Kogyo Co., Ltd.

Yuji Ito

Akio Fukui

Hiroshi Koike

Takehiko Tanaka

Sadao Terui

Michikazu Ninomiya

Yukio Okuda

Atsushi Komai

Naoyuki Shirane

Copper phthalocyanine of a novel crystal form which by measurement using CuK.alpha. radiation of .lambda. = 1.5418 A.U. shows an X-ray diffraction pattern having peaks at Bragg's angles 2.theta. equal to about 8.6.degree., 17.2.degree., 18.3.degree., 23.2.degree., 25.3.degree., 26.5.degree., and 28.8.degree..

Copper phthalocyanine of novel crystal form

A process for the preparation of 1-substituted anthraquinones represented by the general formula I ##EQU1## where, in the formula, R.sub.1 and R.sub.2 represent individually a hydrogen atom or methyl group and X represents a hydroxylamino or amino group, Which comprises treating in a liquid medium a 5-nitro-1,4,4a,9a-tetrahydroanthraquinone represented by the general formula II ##EQU2## where, in the general formula, R.sub.1 and R.sub.2 represent individually a hydrogen atom or methyl group, In the presence of a basic compound with or without a reducing agent.

Process for the preparation of 1-substituted anthraquinones

A process for the preparation of 5-nitro-1,4-naphthoquinone comprising nitrating 1,4-naphthoquinone under such a condition that the dehydrating value of sulfuric acid in the reaction mixture is at least 4 to selectively introduce a nitro group into the 5-position and pouring the reaction mixture into an aqueous medium to precipitate the product.

Process for the preparation of 5-nitro-1,4-naphthoquinone

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Amagasaki, Japan

Yuji Ito