Process for preparing E-isomer of a triazolyl styryl ketone derivative.

摘要

A novel process for preparing E-isomer of triazolyl styryl ketone derivative of the formula (I):
<Chemistry id="chema01" num="0001"><Image id="ia01" he="30" wi="83" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>which comprises treating Z-isomer of the said derivative which may contain E-isomer of the said derivative with sulfuric acid and an isomerization catalyst in an organic solvent, precipitating and separating the resulting sulfuric acid salt of E-isomer from the solution, and decomposing the resulting precipitate to obtain E-isomer of the said derivative free from sulfuric acid. Said E-isomer is useful for preparing E-isomer of triazolyl styryl carbinol of the formula (II):
<Chemistry id="chema02" num="0002"><Image id="ia02" he="33" wi="79" file="IMGA0002.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>which is useful as an antimicrobial, a herbicide, a plant growth regulator, or the like.