| 초록 |
To date, olefin metathesis polymerizations using Grubbs catalysts have been widely used to produce well-defined polyalkenomers. Herein, we demonstrate the first example of cascade polymerization by combining olefin metathesis and metallotropic 1,3-shift reactions to form unique conjugated polymers consisting of sequence-specific polyenynes (triene-yne). By rationally designing of a series of monomers, tetradeca-1,6,8,13-tetrayne moieties, we achieved highly selective cascade transformations via ring-closing/metallotropic 1,3-shift/ring-closing reactions to produce polyenynes with high molecular weights. After careful optimization, living polymerization was realized to give controlled molecular weights and narrow dispersities (Ð). |
