SYNTHESIS OF FUNCTIONALLY-SUBSTITUTED 2-CYANOACRYLATES

The conditions for the Knoevenagel synthesis of 2-cyanoacrylates conta ining double and triple bonds in the alkoxycarbonyl group have been st udied. It was found that the esters are formed in 10-70 % yields by th e condensation of the respective cyanoacetates with formaldehyde in th e 1 : 1 ratio in the presence of piperidine, followed by the pyrolysis of the oligomers formed in vacao at 170-200 degrees C in the presence of para-toluenesulfonic acid. The compounds synthesized readily under go polymerization at room temperature and can be used as the basis for thermostable rapidly polymerizing adhesives.