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

Title compds. I (R = H, C1-4 alkyl or alkoxy), useful as dye intermediates, are prepd. by oxidn. of nitronaphthalenes with Mn2(SO4)3. A melt contg. 173 parts 1-nitronaphthalene was treated over 30 min with 2200 parts of an aq. 36% Mn2(SO4)3-H2SO4 soln. which contained 0.9% Ce2(SO4)3. The mixt. was stirred at 60 Deg and after work-up gave .apprx.55% I (R = H) of 90-95% purity. [on SciFinder (R)]


Year:
1987
Publisher:
(Ciba-Geigy A.-G., Switz.).
Patent number(s):
Laboratories:




 Record created 2006-02-22, last modified 2018-03-17


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)