The invention discloses a novel method for preparing 1-halogenated
alkyne under the
catalysis of a heterogeneous Ag catalyst at
room temperature. The method comprises the steps of mixing terminal
alkyne compounds containing different
substituent groups, N-halogenated
imide and an Ag@C catalyst, putting the mixture into an
organic solvent, and preparing three types of 1-halogenated
alkyne compounds (1-chloro alkyne, 1-bromo alkyne and 1-iodo alkyne) with different
substituent groups under certain catalytic conditions. The catalytic
reaction conditions of the reaction are as follows: the addition amount of the catalyst is 20-30 mg, the
acetonitrile solvent is used, the stirring speed is 500-800 rpm, and the reaction time is 3-6 hours at
room temperature. The Ag@C catalyst is prepared by adopting an impregnation method, an Ag complex is subjected to in-situ reduction with bamboo
powder to generate Ag nano-particles, and finally the Ag nano-particles are carbonized to prepare the
biomass carbon-loaded Ag nano-catalyst. According to the method,
biomass is used as a
raw material to synthesize the catalyst, a
reducing agent does not need to be additionally added, and the catalyst can be repeatedly used and is environment-friendly; the
reaction system is simple and efficient, the 1-halogenated alkyne can be synthesized at high yield at
room temperature, and industrialization is facilitated.