A process for producing a pyrimidine derivative represented by the following formula:
wherein R is an aromatic ring, etc.; X is an oxygen atom, etc.; R¹ , R² and R³ respectively represent a hydrogen atom, etc; and R⁹ and R¹⁰ respectively represent a halogen atom, etc.
which comprises reacting a cyclic compound represented by the following formula:
wherein R, X, R¹, R² and R³ are as defined above
with a pyrimidinyltrimethylammonium chloride compound represented by the following formula:
wherein R⁹ and R¹⁰ are as defined above.
The above-mentioned pyrimidine derivative can be easily produced according to the process of the present invention.