METHOD OF PRODUCING 2-METHYL-1,4-NAPHTHOQUINONE Russian patent published in 2011 - IPC C07C50/12 C07C46/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing 2-methyl-1,4-naphthoquinone (menadione, vitamin K₃) which is widely used as a preparation for improving blood clotting. The method involves oxidation of 2-methylnaphthalene-containing material with hexavalent chromium compounds in an acidic medium. The 2-methylnaphthalene-containing material used is a methylnaphthalene fraction sampled in temperature interval 235-245°C with distillation of stillage bottoms formed when producing naphthalene from the naphthalene fraction of coal tar.

EFFECT: invention enables to obtain an end product using a simple and highly efficient method with higher utilisation of starting material.

2 cl, 3 ex