Process for the preparation of dioxazine compounds

Details Process for the preparation of dioxazine compounds Process for the preparation of dioxazine compounds

1997-10-16

1999-08-03

Daus, Donald G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Chalcogen in the nitrogen containing substituent

C09B 1902

Patent

active

059327278

ABSTRACT:
The present invention relates to a process for the preparation of dioxazine derivatives of the formula I ##STR1## in which R.sup.1 is hydrogen or (C.sub.1 -C.sub.8)-alkyl, by ring closure of a compound of the formula II ##STR2## in the presence of a ring-closure agent, wherein the ring-closure agent used is an N-hetarene N-oxide. The compounds of the formula I are used for producing valuable dyes and pigments.

REFERENCES:
patent: 3826746 (1974-07-01), Schick
patent: 4345074 (1982-08-01), Hufnagel et al.
patent: 4504666 (1985-03-01), Earl et al.
patent: 4997937 (1991-03-01), Tzikas
patent: 5149807 (1992-09-01), Hammond
Derwent abstract: XP-002053097 (1988).
Derwent abstract: XP-002053098 (1987).
Derwent abstract: XP-002053099 (1981).
Derwent abstract: XP-002053100 (1993).
Maki et al Tetrahedron vol. 44 pp. 1187-1194 (1988.

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