Ring opening olefin metathesis polymerization ROMP

The Development of Well-Defined Catalysts for Ring-Opening Olefin Metathesis Polymerizations (ROMP)... 

Ring-opening Olefin Metathesis Polymerization (ROMP) gives a mixture of linear high molecular weight polymer and a series of cyclic oligomers for a number... 

Ring-Opening Olefin Metathesis Polymerization (ROMP) Dendrimers Polymers That Look Like Trees Silicones Summing Up References Cited Other Reading... 

Since ring-opening olefin metathesis polymerizations (ROMPs) [111, 112], yield polymers which contain at least one double bond in the backbone per monomer unit (Fig. 10-17), it is... 

Another example is ring-opening olefin metathesis polymerization (ROMP), as can be used for synthesis of polybutadiene from 1,5-cyclooctadiene. 

Ring-opening olefin metathesis polymerization (ROMP) of strained cyclic olefine is catalyzed by a variety of metathesis catalytic systems. Recently well-characterized alkylidene catalysts, which are able to produce living polymers, were Contribution no. XXXX... 

Alternating copolymers have been previously synthesized via metathesis polymerization by Grubbs et al. using ring-opening insertion metathesis polymerization (ROIMP) [120,121]. Here, a fast ROMP polymerization of a cyclic olefin... 

Scheme 2 Different modes of the olefin metathesis reaction cross metathesis (CM), ringclosing metathesis (RCM), ring-opening metathesis (ROM), acyclic diene metathesis polymerization (ADMET), and ring-opening metathesis polymerization (ROMP)...

In the case of other Group 6 metals, the polymerization of olefins has attracted little attention. Some molybdenum(VI) and tungsten(VI) complexes containing bulky imido- and alkoxo-ligands have been mainly used for metathesis reactions and the ring-opening metathesis polymerization (ROMP) of norbornene or related olefins [266-268]. Tris(butadiene) complexes of molybdenum ) and tungsten(O) are air-stable and sublimable above 100°C [269,270]. At elevated temperature, they showed catalytic activity for the polymerization of ethylene [271]. 

Olefin metathesis (olefin disproportionation) is the reaction of two alkenes in which the redistribution of the olelinic bonds takes place with the aid of transition metal catalysts (Scheme 7.7). The reaction proceeds with an intermediate formation of a metallacyclobutene. This may either break down to provide two new olefins, or open up to generate a metal alkylidene species which -by multiple alkene insertion- may lead to formation of alkylidenes with a polymeric moiety [21]. Ring-opening metathesis polymerization (ROMP) is the reaction of cyclic olefins in which backbone-unsaturated polymers are obtained. The driving force of this process is obviously in the relief of the ring strain of the monomers. 

Several olefin complexes of the Ru(II) aqua-ion [42-44] and of the other Ru complexes [45, 46] have been synthesized and characterized in the ring opening metathesis polymerization (ROMP) or olefin isomerization reactions. The simplest olefin complexes of Ru were also observed, isolated and characterized under ethy-... 

It is worth noting that 6,7-dihydro-2(3//)-oxepinone is an unusual lactone because it can be polymerized by two distinct mechanisms ROP of the cyclic esters by aluminum alkoxides, and the ring-opening metathesis polymerization (ROMP) of endocyclic olefins by the Schrock s catalyst (Fig. 28) [121]. 

The polymerization of cyclic, strained olefins by transition metal alkylidenes of general formula L M = CRR (L = ligand, R, R = H, alkyl, aryl) yields polymers formed via ring-opening that contain unsaturated double bonds within each repetitive unit. Since the mechanism is based on repetitive metathesis steps, this polymerization reaction is known as ring-opening metathesis polymerization (ROMP) (Scheme 1). 

S.L. Mukerjee and V.L. Kyllingstad, Ring-opening metathesis polymerization (romp) of cyclo-olefins with molybdenum catalysts, US Patent 6433 113, assigned to Zeon Corporation (Tokyo, JP), August 13, 2002. 

In general, there are three modes of olefin metathesis ring closing metathesis (RCM),M ring opening metathesis polymerization (ROMP),5-6 and cross metathesis (CM).7-9 Although all three have industrial applications, the main use of olefin metathesis for fine chemicals production lies in the modes of CM and RCM (Scheme 28.1). 

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