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

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

C - Chemistry, Metallurgy

07

D

260/248.6

C07D 253/06 (2006.01) C07D 253/075 (2006.01)

Patent

CA 1214461

Process for preparing virtually isomer-free 4-amino-3- ethylthio-6-tert.-butyl-1,2,4-triazin-5-one 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 - 60°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.

466922

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