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- W2156549291 abstract "4-Aza-1,6-heptadiynes are cyclopolymerized using a series of Schrock- and Grubbs-Hoveyda-type initiators. It is found that with Schrock initiators (i) the concept of large and small alkoxides applies, (ii) the size of the substituents in the 2- and 6-position of the arylimido ligand play a significant role in the mode of insertion, (iii) addition of a base such as quinuclidine to an initiator favors α-insertion and thus five-membered repeat units, and (iv) coordination of the monomer's nitrogen lone pair during the catalytic cycle favors β- over α-insertion and thus results in polymers with a high fraction of six-membered rings. Using modified Grubbs-Hoveyda initiators, cyclopolymerization of the azaheptadiynes lead to the formation of poly(ene)s containing 24–51% six-membered repeat units, thus representing the first Ru-alkylidene-triggered cyclopolymerization of 1,6-heptadiynes with significant β-selectivity." @default.
- W2156549291 created "2016-06-24" @default.
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- W2156549291 date "2011-07-28" @default.
- W2156549291 modified "2023-10-09" @default.
- W2156549291 title "Cyclopolymerization of <i>N,N-</i> Dipropargyl-3,4-dialkoxyanilines Using Schrock and Grubbs-Hoveyda Initiators: Influence of Initiator Structure on the Mode of Insertion" @default.
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- W2156549291 doi "https://doi.org/10.1002/macp.201100211" @default.
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