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Claus Feldmann - One of the best experts on this subject based on the ideXlab platform.
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Bromine rich zinc bromides zn6br12 18 crown 6 2 br2 5 zn4br8 18 crown 6 2 br2 3 and zn6br12 18 crown 6 2 br2 2
Inorganic Chemistry, 2016Co-Authors: David Hausmann, Claus FeldmannAbstract:The Bromine-rich zinc bromides Zn6Br12(18-crown-6)2×(Br2)5 (1), Zn4Br8(18-crown-6)2×(Br2)3 (2), and Zn6Br12(18-crown-6)2×(Br2)2 (3) are prepared by reaction of ZnBr2, 18-crown-6, and Elemental Bromine in the ionic liquid [MeBu3N][N(Tf)2] (N(Tf)2 = bis(trifluoromethylsulfonyl)amide). Zn6Br12(18-crown-6)2×(Br2)5 (1) is formed instantaneously by the reaction. Even at room temperature, compound 1 releases Bromine, which was confirmed by thermogravimetry (TG) and mass spectrometry (MS). The release of Br2 can also be directly followed by the color and density of the title compounds. With controlled conditions (2 weeks, 25 °C, absence of excess Br2) Zn6Br12(18-crown-6)2×(Br2)5 (1) slowly releases Bromine with conconcurrent generation of Zn4Br8(18-crown-6)2×(Br2)3 (2) (in ionic liquid) and Zn6Br12(18-crown-6)2×(Br2)2 (3) (in inert oil). All Bromine-rich zinc bromides contain voluminous uncharged (e.g., Zn3Br6(18-crown-6), Zn2Br4(18-crown-6)) or ionic (e.g., [Zn2Br3(18-crown-6)]+, [(Zn2Br6)×(Br2)2]2–) building un...
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Bromine-rich Zinc Bromides: Zn6Br12(18-crown-6)2×(Br2)5, Zn4Br8(18-crown-6)2×(Br2)3, and Zn6Br12(18-crown-6)2×(Br2)2
2016Co-Authors: David Hausmann, Claus FeldmannAbstract:The Bromine-rich zinc bromides Zn6Br12(18-crown-6)2×(Br2)5 (1), Zn4Br8(18-crown-6)2×(Br2)3 (2), and Zn6Br12(18-crown-6)2×(Br2)2 (3) are prepared by reaction of ZnBr2, 18-crown-6, and Elemental Bromine in the ionic liquid [MeBu3N][N(Tf)2] (N(Tf)2 = bis(trifluoromethylsulfonyl)amide). Zn6Br12(18-crown-6)2×(Br2)5 (1) is formed instantaneously by the reaction. Even at room temperature, compound 1 releases Bromine, which was confirmed by thermogravimetry (TG) and mass spectrometry (MS). The release of Br2 can also be directly followed by the color and density of the title compounds. With controlled conditions (2 weeks, 25 °C, absence of excess Br2) Zn6Br12(18-crown-6)2×(Br2)5 (1) slowly releases Bromine with conconcurrent generation of Zn4Br8(18-crown-6)2×(Br2)3 (2) (in ionic liquid) and Zn6Br12(18-crown-6)2×(Br2)2 (3) (in inert oil). All Bromine-rich zinc bromides contain voluminous uncharged (e.g., Zn3Br6(18-crown-6), Zn2Br4(18-crown-6)) or ionic (e.g., [Zn2Br3(18-crown-6)]+, [(Zn2Br6)×(Br2)2]2–) building units with diBromine molecules between the Zn oligomers and partially interconnecting the Zn-containing building units. Due to the structural similarity, the Bromine release is possible via crystal-to-crystal transformation with retention of the crystal shape
David Hausmann - One of the best experts on this subject based on the ideXlab platform.
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Bromine rich zinc bromides zn6br12 18 crown 6 2 br2 5 zn4br8 18 crown 6 2 br2 3 and zn6br12 18 crown 6 2 br2 2
Inorganic Chemistry, 2016Co-Authors: David Hausmann, Claus FeldmannAbstract:The Bromine-rich zinc bromides Zn6Br12(18-crown-6)2×(Br2)5 (1), Zn4Br8(18-crown-6)2×(Br2)3 (2), and Zn6Br12(18-crown-6)2×(Br2)2 (3) are prepared by reaction of ZnBr2, 18-crown-6, and Elemental Bromine in the ionic liquid [MeBu3N][N(Tf)2] (N(Tf)2 = bis(trifluoromethylsulfonyl)amide). Zn6Br12(18-crown-6)2×(Br2)5 (1) is formed instantaneously by the reaction. Even at room temperature, compound 1 releases Bromine, which was confirmed by thermogravimetry (TG) and mass spectrometry (MS). The release of Br2 can also be directly followed by the color and density of the title compounds. With controlled conditions (2 weeks, 25 °C, absence of excess Br2) Zn6Br12(18-crown-6)2×(Br2)5 (1) slowly releases Bromine with conconcurrent generation of Zn4Br8(18-crown-6)2×(Br2)3 (2) (in ionic liquid) and Zn6Br12(18-crown-6)2×(Br2)2 (3) (in inert oil). All Bromine-rich zinc bromides contain voluminous uncharged (e.g., Zn3Br6(18-crown-6), Zn2Br4(18-crown-6)) or ionic (e.g., [Zn2Br3(18-crown-6)]+, [(Zn2Br6)×(Br2)2]2–) building un...
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Bromine-rich Zinc Bromides: Zn6Br12(18-crown-6)2×(Br2)5, Zn4Br8(18-crown-6)2×(Br2)3, and Zn6Br12(18-crown-6)2×(Br2)2
2016Co-Authors: David Hausmann, Claus FeldmannAbstract:The Bromine-rich zinc bromides Zn6Br12(18-crown-6)2×(Br2)5 (1), Zn4Br8(18-crown-6)2×(Br2)3 (2), and Zn6Br12(18-crown-6)2×(Br2)2 (3) are prepared by reaction of ZnBr2, 18-crown-6, and Elemental Bromine in the ionic liquid [MeBu3N][N(Tf)2] (N(Tf)2 = bis(trifluoromethylsulfonyl)amide). Zn6Br12(18-crown-6)2×(Br2)5 (1) is formed instantaneously by the reaction. Even at room temperature, compound 1 releases Bromine, which was confirmed by thermogravimetry (TG) and mass spectrometry (MS). The release of Br2 can also be directly followed by the color and density of the title compounds. With controlled conditions (2 weeks, 25 °C, absence of excess Br2) Zn6Br12(18-crown-6)2×(Br2)5 (1) slowly releases Bromine with conconcurrent generation of Zn4Br8(18-crown-6)2×(Br2)3 (2) (in ionic liquid) and Zn6Br12(18-crown-6)2×(Br2)2 (3) (in inert oil). All Bromine-rich zinc bromides contain voluminous uncharged (e.g., Zn3Br6(18-crown-6), Zn2Br4(18-crown-6)) or ionic (e.g., [Zn2Br3(18-crown-6)]+, [(Zn2Br6)×(Br2)2]2–) building units with diBromine molecules between the Zn oligomers and partially interconnecting the Zn-containing building units. Due to the structural similarity, the Bromine release is possible via crystal-to-crystal transformation with retention of the crystal shape
Manfred Meisel - One of the best experts on this subject based on the ideXlab platform.
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synthese und kristallstruktur der benzyltriphenylphosphonium bromide c6h5 ch2p c6h5 3 br ch2cl2 und c6h5 ch2p c6h5 3 br3 synthesis and crystal structures of benzyl triphenylphosphonium bromides c6h5 ch2p c6h5 3 br ch2cl2 and c6h5 ch2p c6h5 3 br3
Zeitschrift für Naturforschung B, 1997Co-Authors: J Hubner, Dirk Wulffmolder, H Vogt, Manfred MeiselAbstract:(Benzyl)triphenylphosphonium bromide, [C₆H₅-CH₂P(C₆H₅)₃]⁺Br⁻ (CH₂Cl₂) (1) has been prepared by the reaction of triphenylphosphine with benzylbromide and its structure determined. The colorless crystals are triclinic, space group P1, Z = 2, a = 976.0(3), b = 1069.0(3), c = 1226.1(4) pm, α = 94.13(3), β = 104.70(3), γ = 100.14(3)°. The lattice contains Br⁻ anions and [C₆H₅-CH₂P(C₆H₅)₃]⁺ cations. [C₆H₅-CH₂P(C₆H₅)₃]Br₃ (2) has been obtained by treating compound 1 with equimolar quantities of Elemental Bromine in methylene chloride solution. The red crystals of 2 are monoclinic, space group P2₁/c, Z = 4, a = 917.9(2), b = 1022.6(2), c = 2573.6(5) pm, β = 99.11(2)°, and comprise[C₆H₅-CH₂P(C₆H₅)₃]⁺ cations and linear, slightly asymmetrical Br₃⁻ anions with Bromine-Bromine distances of 246.19(11) and 263.69(11) pm.
Jan Balzarini - One of the best experts on this subject based on the ideXlab platform.
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5 substituted 2 4 diamino 6 2 phosphonomethoxy ethoxy pyrimidines acyclic nucleoside phosphonate analogues with antiviral activity
Journal of Medicinal Chemistry, 2003Co-Authors: Dana Hockova, Antonin Holý, Milena Masojidkova, Graciela Andrei, Robert Snoeck, Erik De Clercq, Jan BalzariniAbstract:2,4-Diamino-6-hydroxypyrimidines substituted in position 5 by an allyl, benzyl, cyanomethyl, ethoxycarbonylmethyl, phenyl, cyclopropyl, or methyl group were prepared either by C5-alkylation or by formation of the pyrimidine ring by cyclization. Their alkylation with 2-[(diisopropoxyphosphoryl)methoxy]ethyl tosylate afforded N1- and O6-regioisomers that were separated and converted to the free phosphonic acids by treatment with bromotrimethylsilane followed by hydrolysis. Reaction of 2,4-diamino-6-{[(diisopropoxyphosphoryl)methoxy]ethoxy}pyrimidine with Elemental Bromine, N-chloro-, or N-iodosuccinimide gave the corresponding phosphorus-protected 5-bromo-, 5-chloro-, and 5-iodo derivatives, respectively. Their deprotection afforded 2,4-diamino-5-bromo- and -5-chloro-6-[2-(phosphonomethoxy)ethoxy]pyrimidines. 2,4-Diamino-5-methyl-6-[2-(phosphonomethoxy)ethoxy]pyrimidine was synthesized also by cross-coupling of the 5-bromo compound with AlMe3, followed by deprotection. The compounds showed poor, if any, inh...
J Hubner - One of the best experts on this subject based on the ideXlab platform.
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synthese und kristallstruktur der benzyltriphenylphosphonium bromide c6h5 ch2p c6h5 3 br ch2cl2 und c6h5 ch2p c6h5 3 br3 synthesis and crystal structures of benzyl triphenylphosphonium bromides c6h5 ch2p c6h5 3 br ch2cl2 and c6h5 ch2p c6h5 3 br3
Zeitschrift für Naturforschung B, 1997Co-Authors: J Hubner, Dirk Wulffmolder, H Vogt, Manfred MeiselAbstract:(Benzyl)triphenylphosphonium bromide, [C₆H₅-CH₂P(C₆H₅)₃]⁺Br⁻ (CH₂Cl₂) (1) has been prepared by the reaction of triphenylphosphine with benzylbromide and its structure determined. The colorless crystals are triclinic, space group P1, Z = 2, a = 976.0(3), b = 1069.0(3), c = 1226.1(4) pm, α = 94.13(3), β = 104.70(3), γ = 100.14(3)°. The lattice contains Br⁻ anions and [C₆H₅-CH₂P(C₆H₅)₃]⁺ cations. [C₆H₅-CH₂P(C₆H₅)₃]Br₃ (2) has been obtained by treating compound 1 with equimolar quantities of Elemental Bromine in methylene chloride solution. The red crystals of 2 are monoclinic, space group P2₁/c, Z = 4, a = 917.9(2), b = 1022.6(2), c = 2573.6(5) pm, β = 99.11(2)°, and comprise[C₆H₅-CH₂P(C₆H₅)₃]⁺ cations and linear, slightly asymmetrical Br₃⁻ anions with Bromine-Bromine distances of 246.19(11) and 263.69(11) pm.