3279-55-8Relevant academic research and scientific papers
Micellar Effects upon Dephosphorylation in Water and Aqueous 1,2-Diols
Bunton, Clifford A.,Gan, Leong-Huat,Hamed, Fareed H.,Moffatt, John R.
, p. 336 - 341 (1983)
Cationic micelles of cetyltrimethylammonium bromide and chloride (CTABr and CTACl) in aqueous ethane- and propane-1,2-diol speed reaction of OH- with p-nitrophenyl diphenyl phosphate (pNPDPP).Reaction with F- was examined in aqueous ethane-1,2-diol.The rate-surfactant profiles have been treated quantitatively by use of the ion-exchange pseudophase model and, for reaction with OH-, direct comparison has been made with the profile for reaction in aqueous CTABr.Reaction with OH- in aqueous CTABr has also been treated quantitatively by use of a mass-action model, and the conclusions of the two treatments are compared.The functional surfactant, N,N-dimethyl-N-(2-hydroxyethyl)-N-hexadecylammonium bromide is an effective dephosphorylating agent in aqueous ethanediol containing NaOH.
Dephosphorylation in Zwitterionic Micelles of Amine Oxide or Betaine Sulfonate Surfactants
Bunton, Clifford A.,Mhala, Marutirao M.,Moffatt, John R.
, p. 3832 - 3835 (1987)
First-order rate constants for reaction of OH- with p-nitrophenyl diphenyl phosphate (p-NPDPP) go through minima with increasing concentrations of dodecyldimethylamine oxide (DDMAO) or N-hexadecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (SB3-16).The initial sharp decrease is ascribed to surfactant binding to submicellar aggregates and fully formed zwitterionic micelles appear to bind OH- weakly, and this binding is decreased by added inert anions.Reactions of bound substrate is faster in micelles of DDMAO than those of SB3-16 because the amine oxide moiety participates in the reaction, probably as a nucleophile.
Single molecule magnet behavior observed in a 1-D dysprosium chain with quasi-D5h symmetry
Huang, Xing-Cai,Zhang, Ming,Wu, Dayu,Shao, Dong,Zhao, Xin-Hua,Huang, Wei,Wang, Xin-Yi
, p. 20834 - 20838 (2015)
Two one-dimensional (1-D) chain complexes with pentagonal bipyramidal DyIII centers have been synthesized and magnetically characterized. Field-induced single molecule magnet behavior has been revealed in both compounds, which is still rarely reported in a lanthanide compound with a pentagonal bipyramidal coordination geometry. Their crystal field parameters and orientations of the magnetic easy axes were obtained from the simulation of the magnetic data and the electrostatic model calculation.
Linear coordination polymers based on aluminum phosphates: Synthesis, crystal structure and morphology
D?bowski,?okaj,Wolak,Zurawski,Plichta,Zachara,Ostrowski,Florjańczyk
, p. 8008 - 8020 (2016/06/01)
Several aluminum tris(diorganophosphates) have been synthesized and characterized via elemental analysis, NMR, FT-IR and Raman spectroscopy, as well as powder XRD, and SEM. Single-crystal X-ray diffraction studies revealed that the aluminum tris(diethylphosphate) crystal structure comprises two crystallographically nonequivalent catena-Al[O2P(OEt)2]3 chains propagating along the c-axis. Their parallel orientation favors the formation of closely packed hexagonal domains. PXRD data suggest that other homologues have a similar structure, with the interchain distance closely corresponding to the dimensions of organic ligands. They are also susceptible to a reversible dissociation to ionic species under the effect of primary amines. This feature can be utilized for the synthesis of epoxy nanocomposites.The Royal Society of Chemistry.
Synthesis, crystal structures and phosphodiesterase activities of alkoxide-bridged asymmetric dinuclear nickel(II) complexes
Wu, Ai-Zhi,Wang, Tao
, p. 205 - 211 (2014/03/21)
An asymmetric dinuclear ligand, N-4-methyl-homopiperazine-N'-[N-(2- pyridylmethyl)-N-2-(2-pyridylethyl)amine]-1,3-diaminopr-opan-2-ol (HL) and two dinuclear Ni(II) complexes [Ni2L(DNBA)2]ClO4 (1) and [Ni2L(BPP)2]ClO4·2H2O (2) (3,5-dinitrobenzoic acid, bisphenyl phosphate) have been synthesized and characterized. Single crystal X-ray crystallographic analysis reveals that the coordination environments of the two Ni(II) atoms in complexes 1 and 2 are five and six coordinate, respectively. The phosphodiesterase activity of a di-Ni(II) complex Ni2L formed in situ from a 2:1 mixture of Ni2+ and HL was investigated using bis(4-nitrophenyl) phosphate (BNPP) as the substrate. The pH dependence of the rate of BNPP cleavage in aqueous buffer indicates a bell-shaped profile with an optimum at about pH 8.4, which is parallel to the formation of the dinuclear species [Ni2LOH]2+ according to UV-vis spectroscopy. At pH 8.4 and 25°C, the kcat (7.40 × 10-5 s-1) is ca.106-fold higher than that of the uncatalyzed reaction. A possible mechanism for BNPP cleavage promoted by Ni2L is proposed.
PROCESS FOR PRODUCING ORGANOALKOXYSILANES FROM ORGANIC ACIDS OR CYANATES AND HALOALKYLALKOXYSILANES
-
Page/Page column 6, (2010/11/25)
A process for the preparation of organoalkoxysilanes containing one or more organic functional groups derived from organic acids or hydrogen cyanates, by a continuous or batch process utilizing a solid guanidinium salt as a phase transfer catalyst for the reaction between a liquid phase haloalkylalkoxysilane and a solid phase alkali or alkaline earth metal salt or ammonium salt of an organic acid or a metal cyanate.
Catalytic activity and anion activation in SN2 reactions promoted by complexes of silicon polypodands. Comparison with traditional polyethers
Maia, Angelamaria,Landini, Dario,Betti, Cecilia,Leska, Boguslawa,Schroeder, Grzegorz
, p. 1195 - 1198 (2007/10/03)
The catalytic activity of silicon polypodands was evaluated in anion-promoted reactions under solid-liquid phase-transfer catalysis (SL-PTC) conditions and compared with that exhibited by common PTC agents. Results showed that these many-armed ligands are
Solvent effects on reactions of hydroxide ion with phosphorus (V) esters. A quantitative treatment
Bunton, Clifford A.,Gillitt, Nicholas D.,Kumar, Anurag
, p. 145 - 151 (2007/10/03)
Second-order rate constants of reactions of HO- with phosphate, phosphinate and thiophosphinate esters, (PhO)2PO.OC6H4NO2-p, Ph2PO.OC6H4NO2-p, Ph2PO.SPh, Ph2PO.SC6H4NO2-p and Ph2PO.SEt, go through minima with decreasing water content of H2O-MeCN or H2O-t-BuOH. The rate decrease is due to stabilization of the non-ionic ester on addition of organic solvent to H2O. This inhibition is partially offset by stabilization of the anionic transition states and in the drier solvents partial desolvation of HO- increases rates.
