Results 251 to 260 of about 74,434 (294)
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1990
Abstract In Chapter 3, I have described the chemistry in which compounds with cumulated double bonds (X=Y=Z) or an unsaturated carbon-carbon bond (e.g. isocyanate, carbodiimide, alkoxyacetylene, vinyl ether, and ketene acetal) undergo reaction with aldoximes, primary nitroalkanes, hydroxamic acids, etc. to give intramolecular dehydration
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Abstract In Chapter 3, I have described the chemistry in which compounds with cumulated double bonds (X=Y=Z) or an unsaturated carbon-carbon bond (e.g. isocyanate, carbodiimide, alkoxyacetylene, vinyl ether, and ketene acetal) undergo reaction with aldoximes, primary nitroalkanes, hydroxamic acids, etc. to give intramolecular dehydration
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Ring-opening Polymerization of Lactones
2018The synthesis of aliphatic polyesters by the ring-opening polymerization of cyclic monoesters was discovered by Carothers in the 1930s. Since then, a plethora of catalysts and initiators have been discovered to promote this polymerization. Nowadays, steadily increasing attention is paid to organocatalysts and, among them, acids, bases, and H-bond ...
Lecomte, Philippe, Jérôme, Christine
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2015
This chapter deals with the application of microwave heating for ring-opening polymerization as it allows good control over the polymerizations combined with a tremendous acceleration of polymerization rates. These polymers represent an area of a great interest for biomedical, industrial and academic concerns.
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This chapter deals with the application of microwave heating for ring-opening polymerization as it allows good control over the polymerizations combined with a tremendous acceleration of polymerization rates. These polymers represent an area of a great interest for biomedical, industrial and academic concerns.
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Radical ring-opening polymerization
Journal of Polymer Science Part A: Polymer Chemistry, 2000This chapter deals with radical ring-opening polymerization (radical ROP), which provides us with a strategy for synthesizing heteroatom-containing polymers by radical processes. Various cyclic monomers capable of radically induced ROP are introduced so that the essential items of molecular designs and polymerization mechanisms can be understood ...
Fumio Sanda, Takeshi Endo
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1995
Formation of polymers through ring-opening reactions of cyclic compounds is an important process in polymer chemistry. In such polymerizations, chain growth takes place through successive additions of the opened structures to the polymer chain.
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Formation of polymers through ring-opening reactions of cyclic compounds is an important process in polymer chemistry. In such polymerizations, chain growth takes place through successive additions of the opened structures to the polymer chain.
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1989
Although the ionic ring-opening polymerization of heterocyclic compounds, such as ethylene oxide, tetrahydrofuran, ethyleneimine, β-propiolactone and caprolactam, as well as the Ziegler–Natta ring opening of cyclic alkenes, such as cyclopentene and norbornene, are well known, free radical ring-opening polymerizations are rather rare.
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Although the ionic ring-opening polymerization of heterocyclic compounds, such as ethylene oxide, tetrahydrofuran, ethyleneimine, β-propiolactone and caprolactam, as well as the Ziegler–Natta ring opening of cyclic alkenes, such as cyclopentene and norbornene, are well known, free radical ring-opening polymerizations are rather rare.
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Cationic Ring-Opening Polymerization
1992Ring-opening polymerization of (hetero)cyclic monomers by a cationic mechanism provides the possibility to produce a very large number of polymers with a broad spectrum of physicochemical properties. As shown in Table 3.1, cationic ring-opening polymerization (CROP) can be applied to most types of heterocycles on condition that the monomers contain ...
Eric J. Goethals, Ronny R. De Clercq
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Anionic Ring-Opening Polymerization
1992Heterocyclic compounds which can undergo ring-opening polymerization by anionic (nucleophilic) mechanisms are more limited than those polymerized by cationic (electrophilic) mechanisms.(1) Table 2.1 displays the representative types of monomers for anionic ring-opening polymerization. Some of the monomers can be polymerized by both anionic and cationic
Shohei Inoue, Takuzo Aida
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