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In the present study, the reaction of thiols with alkyl sulfonyl halides was carried out in a nitrogenous base to compare the reactivity of ‐SH with that of ‐OH, which, however, led to the formation of disulfides. The reaction achieved as a result offers the use of an inexpensive reagent, quantitative yields of the product, and simplicity for the formation of the S‐S bond. 相似文献
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New homologous ammonium-, pyridinium-, and pyrrolidinium-based sulfonamido functionalized ionic liquids have been synthesized in two steps using monoethanolamine, methanesulfonyl chloride, and tosyl chloride as precursors with ethanol as solvent. Attempts to synthesize dual amino functionalized ionic liquid containing both a primary and a secondary amine group in the same ionic liquid are also reported. All functionalized ionic liquids were characterized by 1H and 13C NMR. Melting point and thermal stability of the functionalized ionic liquids were measured by differential scanning calorimetry and thermogravimetric analysis. 相似文献
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Dennis N. Kevill Zoon Ha Ryu Monica A. Niedermeyer Fumie Koyoshi Malcolm J. D'Souza 《Journal of Physical Organic Chemistry》2007,20(6):431-438
The specific rates of solvolysis of methanesulfonic anhydride have been measured conductometrically at ?10 °C in 41 solvents. Use of the extended Grunwald–Winstein equation, with the NT scale of solvent nucleophilicity and the YOTs scale of solvent ionizing power, leads to sensitivity to changes in solvent nucleophilicity (? value) of 0.95 and a sensitivity to changes in solvent ionizing power (m value) of 0.61, with a multiple correlation coefficient (R) of 0.973. Product selectivity values (S) in binary hydroxylic solvents favor alcohol attack in EtOH–H2O (a value of 1.2 in 90% EtOH rising to 4.0 in 40% EtOH) and in MeOH–H2O (a value of 3.7 in 90% MeOH rising to 6.0 in 50% MeOH). In 2,2,2,‐trifluoroethanol–H2O, the S values are much lower at about 0.1. Entropy of activation values are appreciably negative. Literature values for the specific rates of solvolysis of methanesulfonyl chloride have been extended to fluoroalcohol‐containing solvents (titrimetric method) and, at 45.0 °C, for an overall 43 solvents values are obtained (using NT and YC1 scales) of 1.20 for ? and of 0.52 for m (R = 0.969). It is proposed that both substrates solvolyze by an SN2 pathway. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
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Polysulfonylamines. CXV. Rubidium Di(methanesulfonyl)amide, 18-Crown-6, and Water as Building Blocks of a Three-Dimensional Hydrogen-Bond Network: Preparation and Crystal Structure of [Rb(18-crown-6)(H2O)2{(MeSO2)2N}] · H2O The title complex (orthorhombic, space group P212121, Z = 4, X-ray analysis at –130 °C) was obtained by co-crystallizing equimolar amounts of RbN(SO2Me)2 and 18-crown-6 from water/methanol (1/1). The crown ether displays effective D3d symmetry; the Rb⊕ ion is displaced by 99.5(1) pm from the mean plane of the macrocyclic oxygen atoms [Rb–O 290.2(3)–309.7(3) pm] and thus adopts a typical “sunrise coordination”. Two Rb–O contacts from water molecules [295.1(4) and 323.0(4) pm] and a Rb–O contact from the anion [292.0(4) pm], all situated on the opposite side from the crown ether, complete the coordination of the cation. Hydrogen bonding plays a major role in the crystal packing. The complex units, excluding the non-coordinating water molecules, are associated into strands by (H2O)∞ catenation and water…anion hydrogen bonds. The non-coordinating water molecules, located between the parallel strands, cross-link each of them with four adjacent equivalents via water…anion bonds to generate a three-dimensional network. 相似文献
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Polysulfonylamines. XCIX. The First Boron(III) Di(organosulfonyl)amides: A Novel B(OS)2N Six-Membered Ring and Two Aminoborane Structures with Long B–N Bonds Ph2B[N(SO2Me)2] ( 1 ) and the benzo-1,3,2-dioxaboroles C6H4O2BN(SO2R)2, where R = Ph ( 2 a ) or Me ( 2 b ), were prepared by treating the appropriate bromoboranes with Me3SiN(SO2Me)2 and/or AgN(SO2R)2. Their crystal and molecular structures were determined by low-temperature X-ray diffraction ( 1 : monoclinic, space group P21/n; 2 a : monoclinic, P21/c; 2 b : triclinic, P 1, structure marred by disorder of one MeSO2 group). The B atom of 1 features a distorted tetrahedral coordination formed by the ipso-C atoms of the Ph groups and two O atoms of the 1,5-chelating (MeSO2)2N7 anion (B–O 156.5, 157.7 pm). The resulting six-membered B(OS)2N ring adopts a boat conformation, B and N lying out of the plane of the other four atoms. In the chelate ligand, which is severely distorted from the common pseudo-C2 symmetry of the discrete anion, extremely long S–O(B) bonds (151.2, 151.7 pm) are compensated by short N–S bonds (156.1, 156.8 pm). Molecules 2 a and 2 b have aminoborane structures with trigonal-planar coordinations at B and N, unusually long B–N distances suggesting single bonds [ 2 a : 147.6(3), 2 b : 146.3(5) pm], and fairly short N–S bonds ( 2 a : av. 167.4, 2 b : av. 170.4 pm). In 2 a the O2B plane is twisted by 70.9° vs. the NS2 plane, whereas the O2B–NS2 moiety of 2 b is approximately coplanar (twist-angle ca. 9°). 相似文献