FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to the improved method for preparing compound of the formula: 
. Method involves interaction of compound of the formula: 
with compound of the formula: 
wherein Q means chlorine or bromine atom in the presence of solvent or diluting agent, an interphase catalyst and a base wherein solvent or diluting agent represent carbonic acid esters, an interphase catalyst represents ammonium quaternary salt, and a base represents carbonate. Method provides inhibition of process in formation of undesirable isomers.
EFFECT: improved preparing method.
1 cl, 1 ex
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