Richter Gedeon Vegyeszeti Gyar Rt

Denes Mathe

Bela Stefko

Csaba Szantay

Janos Kreidl

Gabor Blasko

Erik Bogsch

Andras Nemes

Istvan Hegedus

Andras Vedres

Tamas Mester

Tibor Nagy

Istvan Gebhardt

Karoly Zalai

Adrien Szuchovszky Nee Gergely

Adrien Szuchovszky, Nee Gergely

Arpad Hadhazy

Gyula Csokas

Acaricidal compositions and process for preparing same

The invention relates to a new process for preparing 6-amino-1,2-dihydro-1-hydroxy-2-imino-4-piperidinopyrimidine of the formula (I), ##STR1## which comprises reacting a pyrimidine derivative of the general formula (II), ##STR2## wherein R.sub.1 stantds for hydrogen or a ##STR3## group, wherein R means a C.sub.1-6 alkyl group or an aryl group optionally substituted by halogen;

Preparation of

A pyrimidine derivative of the formulae (Ia), (Ib) and (Ic), ##STR1## wherein R stands for an alkyl group group with 1 to 6 carbon atoms or an aryl group optionally substituted by halogen atom; and

Pyrimidine derivatives and process preparing the same

Growing community of inventors

Budapest, Hungary

Denes Mathe