N,N′,N″‐Triphenylguanidine‐Sensitized photodegradation of polyethylene

Anionic polymerization of 4-phenyl-1-buten-3-yne derivatives bearing electron-withdrawing groups

“…The controlled polymerization of highly unsaturated monomers plays an important role in the synthesis of well‐defined polymers with unsaturated moieties that are applicable as functional and reactive polymers. For this reason, many efforts have been made to develop precisely controlled polymerizations of, for instance, conjugated dienes,1, 2 allenes,3–5 acetylenes,6–8 and conjugated enynes 9–13. Among them, conjugated enynes are attractive monomers because the controlled polymerization of enynes is expected to give polymers with acetylene, allene, and diene moieties.…”

“…The functions and reactivities of polymers obtained by the anionic polymerization of the enynes are of interest because of their acetylene and allene moieties, which would be dependent on the ratio of the 1,2‐ and 1,4‐polymerized units, the character of the substituents, and the molecular weight of the polymers. Nevertheless, their control has not been achieved yet, except for a few examples of living systems that enable the control of the molecular weights of polymers 11–13. Accordingly, we describe here the anionic polymerization behavior of derivatives of 1 to understand the effect of the substituents on the polymerization behavior and to seek the possibility of preparing well‐defined polyenynes bearing functional groups.…”