halopyrimidin 4 u2032 yl amino cyclopent 2 enylmethanols in which the desired products are obtained in good yield this object is achieved with the process according to claim 1 surprisingly it has been found that if instead of 2 amino 4 6 dichloropyrimidine a 2 5 diamino 4 6 dihalopyrimidine of the general formula is used as starting material and this is allowed to react in the presence of a base in a polar protic solvent with a 4 aminocyclopent 2 enylmethanol of the formula or one of its salts the desired end product of the general formula the substituent x is a halogen atom such as f cl br or i the 2 5 diamino 4 6 dihalopyrimidines such as the 2 5 diamino 4 6 dichloropyrimidine can be prepared in accordance with ep a 0 684 326 the 4 aminocyclopent 2 enylmethanols used can be both the racemic and the optically active compounds such as 1r 4s 1s 4r 1r 4r or 1s 4s 4 amino cyclopent 2 enylmethanols suitable salts thereof are the acid addition salts in particular the hydrohalide salts for example the hydrochlorides or hydrobromides these 4 aminocyclopent 2 enylmethanols in particular the 1r 4s or the 1s 4r enantiomers can be prepared in accordance with wo 97 45529 the reaction is advantageously carried out in the presence of an alkali metal carbonate or alkaline earth metal carbonate alkali metal bicarbonate or alkaline earth metal bicarbonate or in the presence of nitrogen bases such as for example tert amines as the base the alkali metal carbonate or alkali metal bicarbonate used can be sodium carbonate potassium.