Gold -, tetrafluoroborate

IrAu2B2F8P5C7(,Hg3, Iridium(2+), bis[l,2-ethanediylbis(diphenylphosphine)]-(triphenylphosphine)digold-, bis[tetra-fluoroborate(l-)], 29 296 lrAu3BF4N03P5C, H75, Iridium(l+), (nitrato-0,0 )bis(triphenylphos-phine)tris (triphenylphosphine)gold]-, tetrafluoroborate(l-), 29 285 IrAu4BF4PgC, ,H,2, Iridium(l+), di-p-... 

The gold complex, generated in situ from bis(4-isocyanocyclohexyl)gold(I) tetrafluoroborate and (A)-A-methyl-,V-[2-(dialkylamino)ethyl]-l-[(5)-r,2-bis(diphenylphosphino)ferrocenyl]eth-ylamine, is an effective catalyst for the aldol reaction of various aldehydes with methyl iso-cyanoacetate to give the trans- and cw-4,5-dihydro-l,3-oxazoles. Depending on the aldehyde, the transjeis product ratio ranges from 84 16 to 100 0, and the ee of the main diastereomer is between 72 and 97%26. 

Bis(ethylenediamine)gold(III) chloride reacts with /3-diketonates in aqueous base via Schiff base condensation to form complexes of gold(III) with a 14-membered macrocyclic tetraaza ligand such as (292).1711-1713 The X-ray structure showed the cation to be nearly planar. Delocalization of -electrons within the six-membered /3-diketonate rings was indicated by the observed pattern of C—C and C—N distances. Open-chain tetraaza ligand complexes in which condensation of only one /3-diketonate has occurred, can be isolated as intermediates in this reaction. They may be used for further condensation with a different /3-diketonate. Oxidation of this complex with trityl tetrafluoroborate introduces a double bond in position C2C3.1712,1714... 

Bis[Ar,Ar -di(2-pyridyl)- and -di(2-pyridyl-methyl)-imidazol-2-ylidene]aurate(i) tetrafluoroborates have been prepared from the analogous silver complexes on reaction with (tht)AuCl and their structures determined. The configuration of the cations with sterically well-protected two-coordinate gold centers shows no anomalies. However, fascinating structures are found for the adducts with silver tetrafluoroborate obtained as acetonitrile... 

Sun, J. MacFarlane, D. R. Forsyth, M. A new family of ionic liquids based on the l-alkyl-2-methylpyrrolinium cation, Electrochim. Acta, 2003, 48(12), 1707-1711 Fors3dh, S. Golding, J. MacFarlane, D. R. Forsyth, M. A-methyl-iV-alkylpyrrolidinium tetrafluoroborate salts ionic solvents and solid electrolytes, Electrochim. Acta, 2001, 46(10-11), 1753-1757 Golding, J. J. Macfarlane, D. R. Spiccia, L. et al. Weak intermolecular interactions in sulfonamide salts structure of 1-ethyl-2-methyl-3-benzylimidazolium bis[(trifluoromethyl)sulfonyl]amide, Chem. Commun., 1998, 1593-1594. 

The ILs interact with surfaces and electrodes [23-25], and many more studies have been done that what we can cite. As one example, in situ Fourier-transform infrared reflection absorption spectroscopy (FT-IRAS) has been utilized to study the molecular structure of the electrified interphase between a l-ethyl-3-methylimidazolium tetrafluoroborate [C2Qlm][BF4] liquid and gold substrates [26]. Similar results have been obtained by surface-enhanced Raman scattering (SERS) for [C4Cilm][PFg] adsorbed on silver [24,27] and quartz [28]. 

Au,BF4OPjC54H45, Gold(l +), p,-oxo-[tris-[(triphenylphosphine) tetrafluoroborate(l-), 26 326 AujCoO PjRujC H, Ruthenium, dodeca-carbonyltris(triphenylphosphine)-cobalttrigoldtri-, 26 327... 

Interestingly, [AuPhCP Bus)] can also be obtained in quantitative yield in a slow reaction of tris [tri(ferf-butyl)phosphine]gold(I) oxonium tetrafluoroborate with sodium tetraphenylborate as phenylating agent22 [Eq. (2)]. 

Plasma polymerized N-vinyl-2-pyrrolidone films were deposited onto a poly(etherurethaneurea). Active sites for the immobilization were obtained via reduction with sodium borohydride followed by activation with l-cyano-4-dimethyl-aminopyridinium tetrafluoroborate. A colorometric activity determination indicated that 2.4 cm2 of modified poly(etherurethaneurea) film had an activity approximately equal to that of 13.4 nM glucose oxidase in 50 mM sodium acetate with a specific activity of 32.0 U/mg at pH 5.1 and room temperature. Using cyclic voltammetry of gold in thin-layer electrochemical cells, the specific activity of 13.4 nM glucose oxidase in 0.2 M aqueous sodium phosphate, pH 5.2, was calculated to be 4.34 U/mg at room temperature. Under the same experimental conditions, qualitative detection of the activity of a modified film was demonstrated by placing it inside the thin-layer cell. 

Solubility sol dichloromethane, 1,2-dichloroethane, and diethylene glycol dimethyl ether insol diethyl ether and pentane. Preparative Methods the complex is prepared in situ by the reaction of bis(cyclohexyl isocyanide)gold(I) tetrafluoroborate with (R)-N-[2-(N,N-Dimethylamino)ethyl]-N-methyl-l-[(S)-I, 2-bis (diphenylphosphino)ferrocenylJethylamine, typically in dichloromethane. ... 

The gold(I) complex is prepared in situ by the reaction of (1) with bis(cyclohexyl isocyanide)gold(I) tetrafluoroborate (2), typically in anhydrous dichloromethane. The dihydrooxazolines obtained provide a ready access to enantiomerically pure p-hydroxy-a-amino acid derivatives. High diastereo- and enantios-electivity are generally maintained with a wide variety of substituted aldehydes, and a-isocyanoacetate esters. N,N-Dimethyl-a-isocyanoacetamides and a-keto esters have been substituted for the a-isocyanoacetate ester and aldehyde component, respectively, sometimes with improved stereoselectivity. The effect of both the central and planar chirality of (1) on the diastereo- and enantioselectivity of the gold(I)-catalyzed aldol reaction has been studied. The modification of the terminal di-alkylamino group of (1) can lead to improvements in the stereos-... 

Bis(cyclohexyl isocyanide)gold(I) Tetrafluoroborate-(/J)-A/-[2-(A/, N-Dimethylamino)ethyl]-N-methyl- 1-(S)-1, 2-bis(diphenylphosphino)ferrocenyl]ethylamine, 115 C41H50O4... 

---