Process for preparing virtually isomer-free 4-amino-3-ethylthio-

Details Process for preparing virtually isomer-free 4-amino-3-ethylthio- Process for preparing virtually isomer-free 4-amino-3-ethylthio-

1984-10-30

1985-10-08

Ford, John M.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C07D25306

Patent

active

045461783

ABSTRACT:
In the preparation of amino-3-ethylthio-6-tert.-butyl-1,2,4-triazin-5-one (I) by reacting 4-amino-3-mercapto-6-tert.-butyl-1,2,4-triazin-5-one (II) with an ethylating agent in aqueous alkali solution, the improvement which comprises contacting the reaction mixture with at least 50 g of petroleum ether per mole of starting compound (II) at a temperature of about 40.degree.-60.degree. C. thereby forming two liquid phases, and cooling the mixture down to about room temperature, whereby substantially pure isomer-free end product of the formula (I) crystallizes out.

REFERENCES:
patent: 4309538 (1982-01-01), Schmidt et al.
patent: 4315094 (1982-02-01), Bonse et al.
patent: 4328340 (1982-05-01), Bonse et al.
patent: 4408044 (1983-10-01), Schmidt et al.

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