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...alkenes, this is due to [[isomerization]] of the monomer double bond; for heterocycles, this is due to release of monomer ring strain and, in some cases, isomeriz [[File:Lewis acid initiation.png|thumb|325px|center|Initiation with [[boron trifluoride]] (coinitiator) and water (initiator)]] ...

...glas W.|date=2019-10-23|title=Phosphaaluminirenes: Synthons for Main Group Heterocycles|url=https://pubs.acs.org/doi/10.1021/jacs.9b09330|journal=Journal of the Am ...glas W.|date=2019-10-23|title=Phosphaaluminirenes: Synthons for Main Group Heterocycles|url=https://pubs.acs.org/doi/10.1021/jacs.9b09330|journal=Journal of the Am ...

...Incorporating sterically bulky substituents and introducing ring strain in heterocycles can help to prevent bond formation and/or generate elongated bonds. ...obutane-2,4-diyl]], in which the diradical character is localized on the [[boron]] atoms.<ref>{{Cite journal |last1=Scheschkewitz |first1=David |last2=Amii ...