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==Monomers==
[[cyclic compound|Cyclic monomers]] that are amenable to ROP include [[epoxide]]s, cyclic trisiloxanes, some lactones, [[lactide]]s, [[cyclic carbonate]]s, and [[amino acid N-carboxyanhydride]]s.<ref>{{Cite journal|lastlast1=JEROME|firstfirst1=C|last2=LECOMTE|first2=P|date=2008-06-10|title=Recent advances in the synthesis of aliphatic polyesters by ring-opening polymerization☆|journal=Advanced Drug Delivery Reviews|volume=60|issue=9|pages=1056–1076|doi=10.1016/j.addr.2008.02.008|pmid=18403043|issn=0169-409X|url=http://orbi.ulg.ac.be/handle/2268/3723}}</ref><ref>{{cite journal|title=Discrete Cationic Complexes for Ring-Opening Polymerization Catalysis of Cyclic Esters and Epoxides|authors=Yann Sarazin, Jean-François Carpentier|journal=Chemical Reviews|year=2015|volume=115|issue=9|pages=3564–3614|doi=10.1021/acs.chemrev.5b00033|pmid=25897976}}</ref><ref>{{cite journal|title=Ring-Opening Copolymerization of Epoxides and Cyclic Anhydrides with Discrete Metal Complexes: Structure–Property Relationships|first1=Julie M.|last1=Longo|first2=Maria J.|last2= Sanford|first3=Geoffrey W.|last3=Coates|journal=Chemical Reviews|year=2016|volume=116|issue=24|pages=15167–15197|doi=10.1021/acs.chemrev.6b00553|pmid=27936619}}</ref><ref>{{cite journal|author=Kricheldorf, H. R. |year=2006 |title=Polypeptides and 100 Years of Chemistry of Α-Amino Acid N-Carboxyanhydrides|journal=Angewandte Chemie International Edition |volume=45|issue=35|pages=5752–5784|doi= 10.1002/anie.200600693|pmid=16948174 }}</ref> Many strained cycloalkenes, e.g [[norbornene]], are suitable monomers via [[ring-opening metathesis polymerization]].
==History==
Ring-opening polymerization has been used since the beginning of the 1900s to produce [[polymer]]s. Synthesis of [[polypeptides]] which has the oldest history of ROP, dates back to the work in 1906 by Leuchs.<ref>{{cite journal|title=Glycine-carbonic acid|last=Leuchs|first=H.|journal=Berichte der deutschenDeutschen chemischenChemischen Gesellschaft|year=1906|volume=39|page=857|doi=10.1002/cber.190603901133|url=https://zenodo.org/record/1426172}}</ref> Subsequently, the ROP of anhydro [[sugars]] provided [[polysaccharides]], including synthetic [[dextran]], [[xanthan gum]], [[welan gum]], [[gellan gum]], diutan gum, and [[pullulan]]. Mechanisms and thermodynamics of ring-opening polymerization were established in the 1950s.<ref>{{cite journal|last=Dainton|first=F. S.|author2=Devlin, T. R. E. |author3=Small, P. A. |title=The thermodynamics of polymerization of cyclic compounds by ring opening|journal=Transactions of the Faraday Society|year=1955|volume=51|pages=1710|doi=10.1039/TF9555101710}}</ref><ref>{{cite journal|last=Conix|first=André|author2=Smets, G. |title=Ring opening in lactam polymers|journal=Journal of Polymer Science|date=January 1955|volume=15|issue=79|pages=221–229|doi=10.1002/pol.1955.120157918|bibcode=1955JPoSc..15..221C}}</ref> The first high-molecular weight polymers (M<sub>n</sub> up to 10<sup>5</sup>) with a [[repeat unit|repeating unit]] were prepared by ROP as early as in 1976.<ref>{{cite journal|last1= Kałuz̀ynski|first1=Krzysztof|last2=Libiszowski|first2=Jan|last3=Penczek|first3=Stanisław|title=Poly(2-hydro-2-oxo-1,3,2-dioxaphosphorinane). Preparation and NMR spectra|journal=Die Makromolekulare Chemie|volume=178|issue=10|year=1977|pages=2943–2947|issn=0025-116X|doi=10.1002/macp.1977.021781017}}</ref><ref>{{cite journal|last=Libiszowski|first=Jan|author2=Kałużynski, Krzysztof |author3=Penczek, Stanisław |title=Polymerization of cyclic esters of phosphoric acid. VI. Poly(alkyl ethylene phosphates). Polymerization of 2-alkoxy-2-oxo-1,3,2-dioxaphospholans and structure of polymers|journal=Journal of Polymer Science: Polymer Chemistry Edition|date=June 1978|volume=16|issue=6|pages=1275–1283|doi=10.1002/pol.1978.170160610|bibcode=1978JPoSA..16.1275L}}</ref>
An industrial application is the production of [[nylon-6]].
The mechanism for ROMP follows similar pathways as [[olefin metathesis]]. The initiation process involves the coordination of the cycloalkene monomer to the [[Transition metal carbene complex|metal alkylidene complex]], followed by a [2+2] type [[cycloaddition]] to form the metallacyclobutane intermediate that cycloreverts to form a new alkylidene species.<ref name=sutthasupa>{{cite journal|last=Sutthasupa|first=Sutthira|author2=Shiotsuki, Masashi |author3=Sanda, Fumio |title=Recent advances in ring-opening metathesis polymerization, and application to synthesis of functional materials|journal=Polymer Journal|date=13 October 2010|volume=42|issue=12|pages=905–915|doi=10.1038/pj.2010.94|doi-access=free}}</ref><ref name=hartwig>{{cite book|last=Hartwig|first=John F.| author-link = John F. Hartwig | title=Organotransition metal chemistry : from bonding to catalysis|year=2010|publisher=University Science Books|location=Sausalito, California|isbn=9781891389535}}</ref>
[[File:Romp mechanism.png|thumb|center|850px|General scheme of the mechanism for ROMP.]] Commercially relevant [[Saturated and unsaturated compounds|unsaturated]] polymers synthesized by ROMP include Norsorex ([[Norbornene|polynorbornene]]), Vestenamer (polycyclooctene), and Metton (polycyclopentadiene).<ref>{{Cite journal|lastlast1=Love|firstfirst1=Jennifer A.|author-link=Jennifer Love (chemist)|last2=Morgan|first2=John P.|last3=Trnka|first3=Tina M.|last4=Grubbs|first4=Robert H.|date=2002-11-04|title=A Practical and Highly Active Ruthenium-Based Catalyst that Effects the Cross Metathesis of Acrylonitrile|journal=Angewandte Chemie International Edition|volume=41|issue=21|pages=4035–4037|doi=10.1002/1521-3773(20021104)41:21<4035::aid-anie4035>3.0.co;2-i|issn=1433-7851}}</ref><ref>{{Cite journal|lastlast1=Walsh|firstfirst1=Dylan J.|last2=Lau|first2=Sii Hong|last3=Hyatt|first3=Michael G.|last4=Guironnet|first4=Damien|date=2017-09-25|title=Kinetic Study of Living Ring-Opening Metathesis Polymerization with Third-Generation Grubbs Catalysts|journal=Journal of the American Chemical Society|language=EN|volume=139|issue=39|pages=13644–13647|doi=10.1021/jacs.7b08010|pmid=28944665|issn=0002-7863}}</ref>
==Thermodynamics==
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