Results 241 to 250 of about 514,078 (293)
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Cyclic Carbon Cluster Dianions and Their Aromaticity
Journal of the American Chemical Society, 2002Cyclic carbon cluster dianions (CC(2))(2-)(n)(n = 3-6) are investigated by ab initio methods with regard to their geometric properties, electronic stability, and aromaticity. The unique wheel-like structures of these dianions consist of a n-membered carbon ring, where a C(2) unit is attached to each carbon atom.
Sven, Feuerbacher +2 more
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Planar Tetracoordinate Carbons in Cyclic Hydrocarbons
Organic Letters, 2005[structure: see text] A series of cyclic hydrocarbons containing a planar tetracoordinate carbon atom is proposed. To rationalize the electronic factors contributing to the stability of these molecules, an analysis of the molecular orbitals and the induced magnetic field is presented.
Nancy, Perez +6 more
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Cyclic carbonates from carbon dioxide and oxiranes
Monatshefte f�r Chemie Chemical Monthly, 1984The synthesis of cyclic carbonates2 by reaction of carbon dioxide with oxiranes1 in the presence of alkali metal salt-phase-transfer agent catalysts is reported. A reaction mechanism is proposed.
Gabriel Rokicki +2 more
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2018
In this chapter, the ring-opening polymerization (ROP) of cyclic carbonates is described, including mechanism, catalysts/initiators, and types of monomers. Since carbonates are partially esters, the ROP generally proceeds via transesterification and hence some aspects of the catalysis and mechanism overlap with those for cyclic esters.
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In this chapter, the ring-opening polymerization (ROP) of cyclic carbonates is described, including mechanism, catalysts/initiators, and types of monomers. Since carbonates are partially esters, the ROP generally proceeds via transesterification and hence some aspects of the catalysis and mechanism overlap with those for cyclic esters.
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Photolysis of a Cyclic Carbonate Ester and a Cyclic Sulfite Ester
The Chemical Educator, 2014The experiment in this paper addresses mechanistic approaches to chemical reactions involved in an undergraduate advanced laboratory exercise. In this experiment, students will prepare two structurally similar molecules, subject these to irradiation in a polar aprotic solvent and a polar protic solvent, and analyze the mixtures by Nuclear Magnetic ...
Benny E. Arney +3 more
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New carbon carbon bond forming reactions of cyclic sulfate esters and cyclic sulfamidates
Tetrahedron Letters, 2002Abstract Carbon–carbon bonding forming reactions of two cyclic sulfate esters and a cyclic sulfamidate are reported, the former with lithium dianions to give substituted tetrahydrofuran derivatives with displacement of sulfate, and the latter undergoes ring-opening monosubstitution reactions with stabilised organolithiums and an organocuprate species.
Melanie K Pound +4 more
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Synthesis of cyclic carbonates by a novel carbonate rearrangement
Journal of the Chemical Society, Chemical Communications, 19742,3-Dibromopropyl ethyl carbonate (1) and 1,3-dibromo-2-propyl ethyl carbonate (2) equilibrate at 180° with concomitant formation of 3-bromopropylene carbonate (3) and ethyl bromide (4).
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Cyclopropanediol cyclic carbonates
Tetrahedron Letters, 1965Fred W. Breitbeil +3 more
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Recent Progress of Catalysts for Synthesis of Cyclic Carbonates From CO2 and Epoxides
Journal of CO2 Utilization, 2023Ting Yan
exaly
Metal–Organic Frameworks for the Chemical Fixation of CO2 Into Cyclic Carbonates
Coordination Chemistry Reviews, 2020Dinesh De +2 more
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