Copolymer of maleic anhydride with 1,3-dichlorobuten: 2. Synthesis, characterization, and charge-transfer interaction with dimethyl sulfoxide

A new type of copolymer with strong electron accepting ability on the basis of maleic anhydride and 1,3-dichlorobutene-2 has been synthesized. Both solutions and solids have been investigated. It was found that the dissolution of copolymer in dimethyl sulfoxide (DMSO) leads to its transformation: charge-transfer interaction with DMSO and subsequent Pummerer rearrangement.