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Z. Phys. Chem. 218 (2004) 599–609  by Oldenbourg Wissenschaftsverlag, München Electrical Conductances of Tetrabutylammonium Bromide, Sodium Tetraphenylborate and Sodium Bromide in 2-Ethoxyethanol in the Temperature Range 35–50 ◦C By Purushottam Haldar and Bijan Das∗ Department of Chemistry, North Bengal University, Darjeeling 734 430, India (Received February 2, 2004; accepted in revised form March 16, 2004) Electrical Conductance / 2-Ethoxyethanol / Electrolytes / Ion Association / Solvation The electrical conductances of the solutions of tetrabutylammonium

Zeitschrift für Physikalische Chemie Neue Polge, Bd. 105, S. 157-172 (1977) © by Akademische Verlagsgesellschaft, Wiesbaden 1977 Conductimetric Behaviour of Tetraphenylphosphonium Chloride and Sodium Tetraphenylborate in Water-Ethanol Mixtures at 25 °C By S. Schiavo and G. Makrosi Istituto di Chimica Fisica, Università di Roma, Rome, Italy (Received August 5, 1976; revised March 21, 1977) Conductance / Tetraphenylphosphonium chloride j Sodium tetraphenylborate / Ion -association The conductance of tetraphenylphosphonium chloride and of sodium tetra- phenylborate

Abstract

Xenbucin 1, an analgesic drug, was synthesized in 4 steps using two different routes. The biaryl fragment could successfully be produced via a Pd/C catalysed Suzuki coupling in water using sodium tetraphenylborate as a phenylation reagent. Overall yields of the routes were 36% and 59%, respectively.

-n-butylphthalate (DBP), dioctyl terephthalate (DOTP), tributyl phosphate (TBP), nitrobenzene (NB), sodium tetraphenylborate (NaTBP) were purchased from reputed companies and used without any further purification. All metal salts used were reagent grade. The solutions were always prepared in double-distilled water from water distillation unit (Accumax-India). LabIndia pH Conmeter, used to measure pH. All the potentiometric measurements were made with an Elico-LI-10 potentiometer. ELICO SL-243 model atomic absorption spectrophotometer (AAS) was used in the case of real samples for

, we studied cheaply available 2-acetylthiophene based semicarbazone Schiff base as an ionophore. 2 Materials and methods 2.1 Reagents and apparatus High molecular weight PVC, tetrahydrofuran (THF), dioctylphthalate (DOP), di-n-butylphthalate (DBP), dioctyl terephthalate (DOTP), tributyl phosphate (TBP), nitrobenzene (NB), and sodium tetraphenylborate (NaTPB) were purchased from Merck (Darmstadt, Germany) and used without any purification. All metal salts used were reagent grade and purchased from SRL Pvt. Ltd., India. The solutions were always prepared in double

conductance measurements are reported for different thiocyanate salts, viz. ammo- nium thiocyanate (NH4CNS), sodium thiocyanate (NaCNS) and potassium thiocyanate (KCNS), sodium bromide (NaBr), sodium tetraphenylborate (NaBPh4) and tetrabutylammonium bromide (Bu4NBr) in different mole fraction of water-tetrahydrofuran (THF) and water-1,3-dioxolane (1,3-DXL) binary mixtures at 298.15 K. The conductance data have been analyzed by the Fuoss conductance equation in terms of the limiting molar conductance (Λ0), the association constant (KA) and the association diameter (R). The

the number of oxyethyl groups of nonionogenic surfactants , Zavod. Labor. 58 (1992) 6 – 8 . 15. Gallegos , R. D. : Titration of non-ionic surfactants with sodium tetraphenylborate using the Orion surfactant electrode , Analyst 118 (1993) 1137 – 1141 . 10.1039/an9931801137 16. Khmel'nitskaya , E. Yu. and Kolokolov , B. N. : Determination of the number of oxyethyl groups in nonionic surfactants using ion-selective electrodes , J. Anal. Chem. 50 (1995) 1108 – 1110 . 17. Kulapina , E. G. and Apukhtina , L.V. : A study of the state of electroactive

) Coupling Constant, Phosphonate Complexes A simple two step synthesis of the salts M[(C5H5)Co{P(0)(OC2H5)2}3], M = Li, Na, K, Ag, NH4, NMe4 is described. The air stable, diamagnetic anion reacts as a tridentate 0,0,0-chelating ligand with all main group III elements. With sodium tetraphenylborate the cage-like cationic complex [(C5H5)Co{[P(0)(OC2H5)2]3BPh}]+ is obtained. With M(III) = Al,Ga, In, Tithe trinuclear sandwich compounds [{(C5H5)Co[P(0)(OC2H5)2]3}2M]+ are formed, which contain MOß octahedra. With M(III) = TI a coupling constant 6J(T10P0CCH) = 1.0 Hz is

lithium chloride (LiCl), lithium bromide (LiBr), lithium iodide (LiI), lithium perchlorate (LiClO4), lithium tetrafluoroborate (LiBF4), sodium bromide (NaBr), sodium tetraphenylborate (NaBPh4), potassium bromide (KBr), rubidium bromide (RbBr), cesium bromide (CsBr) and tetrabutylammonium bromide (Bu4NBr) in N,N-dimethylacetamide+ water (50% v/v) mixture have been reported at 25 ◦C in the concentration range 0.02–0.05 mol dm−3. The conductance data have been analyzed by the 1978 Fuoss conductance–concentration equation in terms of the limiting molar conductance (Λ0), the

- protonation of 5a, b with one equivalent of sodium hydroxide, the guanidinium chlorides 4a, b are accessible, and a further deprotonation leads to the aminoguanidines 6a, b, which hydrolyze in the presence of excessive aqueous sodium hydroxide to give the aminoalkylureas 7a, b. The salts 9a, b and 10a, b were synthesized from 4a, b and 5a, b, respectively, by anion metathesis by means of sodium tetraphenylborate. 7a reacts with dimethyl sulfate to give the waxy ammonium salt 11a, which was converted to the crystalline tetraphenylborate salt 12a. The crystal structures of