Results 81 to 90 of about 933 (135)
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Photochemical cycloadditions of 1,3-dioxoles to anisole
Journal of the Chemical Society, Perkin Transactions 1, 1987Anisole yields both ortho- and meta-cycloadducts upon irradiation in the presence of 1,3-dioxole and 2,2-dimethyl-1,3-dioxole. The mode and the regio- and stereo-selectivities of these cycloadditions are rationalized on the basis of the exciplex–zwitterion mechanism.
Jochen Mattay +4 more
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5-(p-Tolylamino)benzo-1,3-dioxole
Acta Crystallographica Section C Crystal Structure Communications, 1997The title compound, C l4 H 13 NO 2 , is used in the preparation of phenothiazine drugs. The observed structure, with torsion angles of 13.3 (3) and 37.4 (3)° about the C aryl -N bonds, has been used for semi-empirical calculations. The resulting predictions are in accord with the observed selectivity of the reaction.
Chatel, F., Boyer, G., Galy, J.
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Electrophilic substitution in 4-substituted benzo-1,3-dioxoles
Chemistry of Heterocyclic Compounds, 1979V Gineityte
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Synthesis of 2,2-functionalized benzo[1,3]dioxoles
Tetrahedron, 2009Highly functionalized catechol ketals exhibiting either a tert-butyl moiety or a spiro center in position 2 are synthesized by ketalization and functionalized in a sequence of subsequent transformations. By a specific ketalization protocol catechol ketals of enolizable β-keto esters can be prepared. With the succeeding steps these compounds incorporate
Nader M. Boshta +2 more
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On the non-planarity of 1,3-dioxole and 1,3-dioxolane
Chemical Physics Letters, 2010Abstract The conformational preferences of 1,3-dioxole and 1,3-dioxolane are explained on the basis of the QTAIM electron density analysis of B3LYP/6-311++G(2d,2p) electron distributions, supporting the interpretation of the anomeric effect previously proposed by Vila and Mosquera [14] . Thus, distances from methylenic hydrogens to oxygen lone pairs
Antonio Vila, Ricardo A. Mosquera
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ChemInform Abstract: SYNTHESIS OF SUBSTITUTED 1,3‐DIOXOLES
Chemischer Informationsdienst, 1983AbstractDie Isomerisierung von 4‐Methylen‐l ,3‐ dioxolanen (I) zu 4 Methyl‐l ,3‐dioxolen (II) mit Kalium‐tert.‐butoxid bzw. mit dem schwach sauren Ionenaustauscher Lewatit CNP 80 wird eingehend untersucht.
J. MATTAY, W. + THUENKER, H.‐D. SCHARF
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Anomeric Effect in 1,3-Dioxole: A Theoretical Study
Journal of the American Chemical Society, 1996A theoretical analysis on planar and puckered-ring conformations of cyclopentadiene, 2,3-dihydrofuran, and 1,3-dioxole is carried out to test the conclusion of Laane and co-workers (J. Am. Chem.
D. Suárez, T. L. Sordo, J. A. Sordo
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Thermal rearrangements of some α-aroyl epoxides into dioxoles
Journal of the Chemical Society Chemical Communications, 1972Thermal rearrangement of α-cyano-α-oxo-epoxides quantitatively affords the corresponding dioxoles, which are formed by initial cleavage between the two carbon atoms of the starting epoxide ring.
Albert Robert
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Studies of dioxole ring substituted 3,4-methylenedioxyamphetamine (MDA) analogues
Pharmacology Biochemistry and Behavior, 1989The 3,4-ethylidenedioxy and 3,4-isopropylidenedioxy analogues, EDA and IDA, respectively, of 3, 4-methylenedioxyamphetamine (MDA) were compared to MDA in drug-stimulated [3H]-serotonin overflow from prelabelled rat hippocampal slices, [3H]-dopamine overflow from prelabelled rat caudate slices, in their ability to displace the 5-HT2 agonist R-[125I]-DOI
D E, Nichols +4 more
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The meta photocycloaddition of anisole and benzene to 2-methyl-1,3-dioxole
Journal of Photochemistry, 1985Abstract In order to investigate some stereochemical aspects of the meta photo-cycloaddition or arenes to alkenes, anisole and benzene were irradiated at 254 nm in the presence of 2-methyl-1,3-dioxole. The main products formed were those having the least steric hindrance along the proposed pathway.
OSSELTON, EM +2 more
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