Homo- and Heterodinuclear Helicates of Lanthanide(III), Zinc(II) and Aluminium(III) Based on 8-Hydroxyquinoline Ligands
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The silver aluminates AgAl[OC(CF3)2(R)]4 (R = H, CH3, CF3) react with solns. of white phosphorus P4 to give complexes that bind one or two almost undistorted tetrahedral P4 mols. in an h2 fashion: [Ag(P4)2]+[Al(OC(CF3)3)4]- (1) contg. the 1st homoleptic me ...
The performance of deuterium-carbon correlation (DECOR) spectroscopy for the assignment and measurement of deuterium quadrupolar couplings in fully deuterated liquid crystalline phases is analyzed. The experiment relies on a broadband polarization transfer ...
An improved method for the prepn. of Me2C:CFCO2Et is described. The two stereoisomers (E)- and (Z)-BrCH2CMe:CFCO2Et obtained by g-bromination are sepd. and can be individually converted into the corresponding phosphonates. The PO-ylides generated by a-depr ...
Carbamoylphosphate has been shown to be the educt for the synthesis of the CN ligands of the NiFe metal centre of hydrogenases from Escherichia coli. In the absence of carbamoylphosphate, cells accumulate a complex of two hydrogenase maturation proteins, n ...
Reductive radical alpha-D-galactosidation of 5-exo-(benzeneselenyl)-6-endo-chloro-3-methylidene-7- -oxabicyclo[2.2.1]heptan-2-one with acetobromo-D-galactose, followed by ketone reduction led to (+)-(1R,2S, 3R,4S,5S,6S)-5-exo-(benzeneselenyl)-6-endo-chloro ...
N-Protected tropenone derivs. I (R = CO2Me, CBZ, Ts) prepd. from the resp. pyrroles and tetrabromoacetone, were used as starting materials for desymmetrization by hydroboration of the C-C double bond. Hydroboration of I with (-)-(Ipc)2BH followed by oxidn. ...
Hexamethylenetetramine suberate is an organic compound presenting a one-dimensional modulation with strong satellite reflections between 123 and 300 K. Single-crystal X-ray intensities of main reflections and satellites up to fourth order have been measure ...
In the presence of catalytic amts. of a fluoride source, O-trimethylsilyl enethers undergo condensation with acyl fluorides to afford O-enesters with high yields. The intermediates and final products are pure (Z) isomers if only one double bond is in conju ...
The prepn. and characterization of two novel dinuclear tantalum hydride complexes featuring bridging silanimine ligands are reported. The reaction of Cp*(ArN:)Ta[Si(SiMe3)3]H (Cp* = h5-C5Me5; Ar = 2,6-iPr2C6H3) with PhSiH3 resulted in formation of [Cp*(ArN ...
A new two-dimensional NMR carbon-proton chemical shift correlation experiment, the MAS-J-HMQC experiment, is proposed for natural abundance rotating solids. The magnetization transfer used to obtain the correlations is based on scaler heteronuclear J coupl ...
