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p) probably due to different steric environments in the initiating and propagating species. The trisubstituted vinylrhodium moiety in the initiating species is sterically more demanding than the disubstituted vinylrhodium moiety in the propagating species. Hence, coordination of PA to the propagating species should be more facile than to the initiating species, causing broadening of MWD in the initial stage of polymerization (see Chart 2).
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p) probably due to different steric environments in the initiating and propagating species. The trisubstituted vinylrhodium moiety in the initiating species is sterically more demanding than the disubstituted vinylrhodium moiety in the propagating species. Hence, coordination of PA to the propagating species should be more facile than to the initiating species, causing broadening of MWD in the initial stage of polymerization (see Chart 2).
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33846143350
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Catalyst 2 was also employed for the polymerization of N-propargyl-heptanamide (3a, tert-butylacetylene (3b, and n-hexyl propiolate (3c, In the presence of 5 equiv of Ph3P to Rh, catalyst 2 polymerized 3a with somewhat broad MWD (Mw/Mn, 1.40, and further increase of Ph3P did not narrow the MWD. Despite the broad MWD, the M n of the formed polymer increased in direct proportion to polymer yield, while the Mw/Mn practically remained unchanged in the multistage polymerization of 3a thus indicating a living-like nature of this polymerization. The larger Mw/M n values are probably an outcome of an unfavorably large ratio of propagation and initiation rates (kp/ki) in accordance with our previous results.18b The catalyst system 2/Ph3
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n and polymer yield was far from linear ruling out the possibility of living polymerization. Monomer 3c afforded polymer only in low yield (≤20%) with bimodal GPC curve, suggesting a nonliving polymerization.
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