Results 291 to 300 of about 830,676 (348)
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Neurology India, 2005
A 12-year-old boy presented to us with subacute onset of progressive quadriparesis and blurring of vision in the right eye. His sensorium was normal. There was hyper-reflexia and spasticity in all four limbs and the plantar reflex was bilaterally extensor. Vision in the right eye was 6/18. The fundus examination was normal. Cerebrospinal fluid revealed
Ata Siddiqui +2 more
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A 12-year-old boy presented to us with subacute onset of progressive quadriparesis and blurring of vision in the right eye. His sensorium was normal. There was hyper-reflexia and spasticity in all four limbs and the plantar reflex was bilaterally extensor. Vision in the right eye was 6/18. The fundus examination was normal. Cerebrospinal fluid revealed
Ata Siddiqui +2 more
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Radical Ring-Closing/Ring-Opening Cascade Polymerization
Journal of the American Chemical Society, 2019A novel strategy for the synthesis of main-chain polymers through radical ring-closing/ring-opening cascade polymerization is reported. Efficient radical cyclopolymerization was achieved through systematic optimization of the electronic properties of 1,6-diene structures.
Hanchu Huang +6 more
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Macromolecular Rapid Communications, 2000
Since the days of Carothers polycondensations and other step-growth polymerizations were described in the review articles and textbooks on the basis of linear monomers. Having reactive “a” and/or “b” groups, on the other hand, cyclic monomers were usually presented in combination with Ring-Opening Polymerizations (ROPs) which obey the kinetic scheme of
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Since the days of Carothers polycondensations and other step-growth polymerizations were described in the review articles and textbooks on the basis of linear monomers. Having reactive “a” and/or “b” groups, on the other hand, cyclic monomers were usually presented in combination with Ring-Opening Polymerizations (ROPs) which obey the kinetic scheme of
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Ring Opening Metathesis Polymerization
Current Opinion in Solid State and Materials Science, 1999This article intends to provide the reader with a basic knowledge of Ring Opening Metathesis Polymerization. Some historic background, mechanistic aspects, living polymerization, as well as current catalyst development and new applications are discussed.
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2017
Ring-opening polymerization (ROP) is an important method of polymerization. It differs from radical polymerization (Chap. 9), ionic polymerization (Chap. 10), and step-growth polymerization (Chap. 8). No low-molar-mass by-products are formed, except during the polymerization of Leuchs’ anhydride (Figs. 12.41 and 12.42).
Sebastian Koltzenburg +2 more
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Ring-opening polymerization (ROP) is an important method of polymerization. It differs from radical polymerization (Chap. 9), ionic polymerization (Chap. 10), and step-growth polymerization (Chap. 8). No low-molar-mass by-products are formed, except during the polymerization of Leuchs’ anhydride (Figs. 12.41 and 12.42).
Sebastian Koltzenburg +2 more
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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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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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Catalytic Enantioselective Ring-Opening Reactions of Cyclopropanes
Chemical Reviews, 2021Vincent Pirenne +2 more
exaly
C–C Bond Cleavages of Cyclopropenes: Operating for Selective Ring-Opening Reactions
Chemical Reviews, 2021Ruben Vicente
exaly