Ring opening anionic

Many perfluoroaUphatic ethers and tertiary amines have been prepared by electrochemical fluorination (1 6), direct fluorination using elemental fluorine (7—9), or, in a few cases, by fluorination using cobalt trifluoride (10). Examples of lower molecular weight materials are shown in Table 1. In addition to these, there are three commercial classes of perfluoropolyethers prepared by anionic polymerization of hexafluoropropene oxide [428-59-1] (11,12), photooxidation of hexafluoropropene [116-15-4] or tetrafluoroethene [116-14-3] (13,14), or by anionic ring-opening polymeriza tion of tetrafluorooxetane [765-63-9] followed by direct fluorination (15). 

PA-5 can be synthesized by die anionic ring-opening polymerization of a-piperidone.12 First the catalyst, A -acetyl piperidone, is prepared. Then the polymerization is performed anionically, well below its melting temperature. 

Poly (dimethyl siloxane) obtained by anionic ring-opening polymerization of hexamethylcyclotrisiloxane (D3) can also be end-capped with vinylbenzyl bromide or other electrophiles, such as p. (chlorodimethylsilyl)styrene80). 

Suzuki, M. Kotani, J. Gyobu, S. Kaneko, T. Saegusa, T. 1994. Synthesis of sequence-ordered polysilane by anionic ring-opening polymerization of phenylno-namethycyclopentasilane. Macromolecules 27 2360-2363. 

Ring opening polymerization of hexasila[6](2,5)thiophenophane 49 was examined (46). Anionic ring opening polymerization of 49 with... 

As the first, and perhaps the most well-studied form of living polymerizations, anionic procedures have attracted considerable attention both academically and industrially [2, 3], While numerous examples of living procedures have been developed, they can be classified into two main families carbanionic polymerization of vinyl monomers and anionic ring opening polymerizations. 

For example, see Slomkowski, S. and Duda, A. Anionic ring-opening polymerization, In Ring-Opening Polymerization, Mechanisms, Catalysis, Structure, and Utility, Brunelle, D. J. (Ed.), Hanser-Verlag, New York, pp. 87-128, 1993. 

The first example of a catalytic reaction at the core of dendrimers was provided by Frechet (79) using dendritic alcoholates such as 86 as macro-initiators for anionic ring-opening polymerization of a-caprolactone. Usually the alkali... 

Mingotaud A-F, Dargelas F, Cansell F (2000) Cationic and anionic ring-opening polymerization in supercritical CO2. Macromol Symp 153 77-86... 

Kudoh R, Sudo A, Endo T (2009) Synthesis of eight-membered lactone having tertiary amine moiety by ring-expansion reaction of 1,3-benzoxazine and its anionic ring-opening polymerization behavior. Macromolecules 42 2327-2329... 

Barbaud C, Fay F, Abdillah F, Randriamahefa S, Guerin P (2004) Synthesis of new homopolyester and copolyesters by anionic ring-opening polymerization of a, a , P-trisubstituted P-lactones. Macromol Chem Phys 205 199-207... 

The typical anionic ring-opening polymerization involves the formation and propagation of anionic centers. Reaction proceeds by nucleophilic attack of the propagating anion on monomer ... 

Boileau, S., Anionic Ring-Opening Polymerizations Epoxides and Episulfides, pp. 467 487 in Comprehensive Polymer Science, Vol. 3, G. C. Eastmond, A. Ledwith, S. Russo, and P. Sigwalt, eds., Pergamon Press, London, 1989. 

Slomkowski, S. and A. Duda, Anionic Ring-Opening Polymerization, Chap. 3 in Ring-Opening Polymerization. Mechanism, Catalysis, Structure, Utility, D. J. Brunelle, eds., Hanser, Munich, 1993. 

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