PROCESS FOR THE PREPARATION OF 1-METHYLCYCLOPROPENE Russian patent published in 2018 - IPC C07C13/04 C07C1/26 A23B7/152 A01N25/02 A01N27/00 A01P21/00 

FIELD: chemistry.

SUBSTANCE: invention relates to process for preparation of 1-methylcyclopropene by reacting a metallyl chloride (3-chloro-2-methylpropene) or a metallyl bromide (3-bromo-2-methylpropene) with bases in a polar aprotic organic solvent medium, and the yield of the desired product is increased to 46.2 %, and the content of methylene-cyclopropane without the low-temperature rectification stage is reduced to 0.025 %. Process is characterized in that the process is carried out in the presence of quaternary ammonium salts in an amount of 0.01 to 0.5 mole fractions of the base content in the presence of an olefin of an ethylene series or mixtures thereof in an amount of 0.01 to 0.50 mole fractions of the content metallyl chloride or metallyl bromide.

EFFECT: yield of the target product increases, content of methylene-cyclopropane harmful for further processing into a commercial preparation decreases.

1 cl, 2 tbl, 2 ex