Ring-opening metathetic polymerization

Ring-Opening Metathetic Polymerization of Porphyrazines under the Conditions Described in the Texta... 

The present contribution deals primarily with the polymer synthesis via ring-opening metathesis polymerization. Acyclic diene metathesis (ADMET) [20,32-38], the other metathetic route to polymers is omitted. This article intends to give a brief overview, for more details and further applications see, e.g.. Refs. [1,4,20-29]. 

Further variations of the basic motif of 1 comprise carbene le in which the anionic ligands are trifluoroacetate rather than chloride (Fig. 2) [4d]. However, this specific compound shows a significant tendency to isomerize the double bonds of the substrates in addition to its metathetic activity. Moreover, water soluble catalysts have been developed that contain bulky aliphatic phosphine ligands with either a quarternary ammonium group (lf,g) or a sulfonate function (lh) [12]. They have been tested in the ring opening polymerization... 

Results of investigations related to the mechanistic aspects of ring-opening reactions of cyclo-olefins have been discussed by Dolgoplosk et al the individual stages of the process were considered. Formation of stable complexes of carbenes of the type RQCH= (Q = O, S, or Si) inhibit the chain process of metathetical polymerization of cyclo-olefins. ... 

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