Condensing agents in polycondensation

The advances have been examined and trends noted in the development of a new method of synthesis of heterochain polymers which has been called "direct polycondensation" and is based on the interaction of monomers under mild conditions in the presence of various condensing agents. The latter form reactive derivatives with one of the monomers, which then react in situ with the monomer of the opposite nature. It has also been shown that the condensing agents can be used successfully in the synthesis of activated dicarboxylic acid diesters and diamides, which are promising electrophilic monomers for the synthesis of a wide variety of heterochain polymers under the conditions of low-temperature polycondensation in solution. The possibilities of the synthesis of polymers by the "biochemical" activation of monomers, i.e. using enzymes as "condensing agents", are discussed. 220 references.