FIELD: organic chemistry, polymers. SUBSTANCE: invention relates to novel compounds, for example, poly-(monoperoxycarbonates) of the general structure (A): 
where R, R1 are determined in short report of the invention essence, for example, 1,1,1-tris-(tert.-butylperoxycarbonyl-hydroxymethyl)ethane, intermediate compounds for their synthesis and methods of their synthesis and using also. Monoperoxycarbonates are useful for initiation of polymerization reaction of ethylene-unsaturated monomers, in part, styrene, hardening unsaturated polyesters and for initiation of molecular mass of polymers by cross-linking or controlled chain destruction. EFFECT: improved method of synthesis, valuable technological properties of compounds. 18 cl, 6 tbl
