Metal-Free Ring-Opening Metathesis Polymerization with Hydrazonium Initiators.
Metal-Free Ring-Opening Metathesis Polymerization with Hydrazonium Initiators.
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DOI:
10.1002/anie.202203344
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发表时间:
2022-06-13
影响因子:
16.6
通讯作者:
Lambert, Tristan H.
中科院分区:
文献类型:
--
作者:
Quach, Phong K.;Hsu, Jesse H.;Keresztes, Ivan;Fors, Brett P.;Lambert, Tristan H.
The ring–opening metathesis polymerization (ROMP) of cyclopropenes using hydrazonium initiators is described. The initiators, which are formed by the condensation of 2,3-diazabicyclo[2.2.2]octane and an aldehyde, polymerize cyclopropene monomers by a sequence of [3+2] cycloaddition and cycloreversion reactions. This process generates short chain polyolefins (Mn ≤ 9.4 kg/mol) with relatively low dispersities (Đ ≤ 1.4). The optimized conditions showed efficiency comparable to that achieved with Grubbs’ 2nd generation catalyst for the polymerization of 3-methyl-3-phenylcyclopropene. A positive correlation between monomer to initiator ratio and degree of polymerization was revealed through NMR spectroscopy. The metal–free ring–opening metathesis polymerization (ROMP) of 3,3-disubstituted cyclopropenes with hydrazonium initiators ultilizing the principle of carbonyl–olefin metathesis is demonstrated.
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