Results 251 to 260 of about 39,317 (310)
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Polymer Bulletin, 1986
Cyclic silyl pinacole ethers are a new class of difunctional free radical initiators which have been prepared and characterized. On the basis of their first order kinetic rates of dissociation and half-lives, these compounds are high temperature initiators useful generally above 120°C.
J. V. Crivello, J. L. Lee, D. A. Conlon
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Cyclic silyl pinacole ethers are a new class of difunctional free radical initiators which have been prepared and characterized. On the basis of their first order kinetic rates of dissociation and half-lives, these compounds are high temperature initiators useful generally above 120°C.
J. V. Crivello, J. L. Lee, D. A. Conlon
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3,4‐Benzoxanthene cyclic ethers
Recueil des Travaux Chimiques des Pays-Bas, 1965AbstractTreatment of 3,4‐benzoxanthone hydrazone with tetrahalogeno‐α‐benzoquinones gave the corresponding cyclic ethers (IIIa‐b). Reductive cleavage of the latter with lithium aluminium hydride yielded 3,4‐benzoxanthene together with the tetrahalogenocatechol.
A. Mustafa, N. Latif, H. El‐Namaky
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Dilithiated Synthons: Synthesis of Cyclic Ethers.
ChemInform, 2003AbstractFor Abstract see ChemInform Abstract in Full Text.
F. Alonso, J. Meléndez, M. Yus
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Macromolecules, 1995
The efficient preparation of a range of cyclic (aryl ether ketone)s containing the 1,2-dibenzoylbenzene moiety via the nucleophilic aromatic substitution route with the use of the pseudo-high dilution principle was developed. Chemical transformation of the 1,2-dibenzoylbenzene moiety of these cyclic (aryl ether ketone)s led to the preparation of novel ...
Kwok P. Chan +4 more
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The efficient preparation of a range of cyclic (aryl ether ketone)s containing the 1,2-dibenzoylbenzene moiety via the nucleophilic aromatic substitution route with the use of the pseudo-high dilution principle was developed. Chemical transformation of the 1,2-dibenzoylbenzene moiety of these cyclic (aryl ether ketone)s led to the preparation of novel ...
Kwok P. Chan +4 more
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Photopolymerization of unsaturated cyclic ethers
Polymer, 1998Abstract 2,3-Dihydro-4H-pyran, DHP, and 2,3-dihydrofuran, DHF, are photopolymerized at ambient temperature with the aid of diphenyl iodonium hexafluorophosphate, Ph 2 I + PF 6 − or triphenyl sulfonium hexafluorophosphate, Ph 3 S + PF 6 − at λ inc = 310 or 340 nm, respectively.
Qin Qin Zhu, Wolfram Schnabel
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Polymerization of Cyclic Ethers
Journal of Macromolecular Science: Part A - Chemistry, 1972Abstract In the present series of studies on the cationic polymerization of cyclic ethers, the reactivities of cyclic ethers were quantified and the effect of the catalyst upon the polymerization kinetics was revealed. These kinetic analyses were successfully performed by means of our “phenoxyl end-capping method”.
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Photoinduced sulfonylation of cyclic ethers
Tetrahedron Letters, 2014Abstract A one-step preparation of α-sulfonylated cyclic ethers has been achieved via the intermolecular sulfonylation of ethereal C H bonds. In this process, the chemoselective cleavage of the ethereal C H bond was achieved by hydrogen abstraction with photo-excited benzophenone, and the sulfonyl unit was provided by sulfonyl chloride. This protocol
Shin Kamijo +4 more
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Terpolymerization of Cyclic Ethers with Cyclic Anhydride
Journal of Macromolecular Science: Part A - Chemistry, 1973Abstract A unique solution polymerization and polymer family have been discovered in the ring-opening terpolymerization of three heterocyclic monomers initiated by organometallic compounds, particularly trialkylaluminum. The products have repeating ether-ester-ester linkages along the chain and are alternating terpolymers, … ABCABCABC…, of three ...
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The photoalkylation of cyclic ethers
Tetrahedron, 1967Abstract The acetone, acetophenone and benzophenone-initiated photochemical alkylation of cyclic ethers with olefins is described. Alpha-alkylated cyclic ethers were obtained as the 1:1-adducts in yields of up to 40% with terminal olfeins, and yields of up to 82% with α,β-unsaturated esters.
I. Rosenthal, D. Elad
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Oxidative Kinetic Resolution of Cyclic Benzylic Ethers
Angewandte Chemie International Edition, 2020AbstractA manganese‐catalyzed oxidative kinetic resolution of cyclic benzylic ethers through asymmetric C(sp3)−H oxidation is reported. The practical approach is applicable to a wide range of 1,3‐dihydroisobenzofurans bearing diverse functional groups and substituent patterns at the α position with extremely efficient enantiodiscrimination.
Shutao Sun +3 more
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