A set of Cu(I) complexes with 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo-[3.3.1]nonane (DAPTA) phosphine ligands viz. [CuX(κP-DAPTA)3] (1: X = Br; 2: I) and [Cu(μ-X)(κP-DAPTA)2]2 (3: 4: were immobilized on activated carbon (AC) multi-walled nanotubes (CNT), as well these materials after surface functionalization. The copper(I) have shown favorable catalytic activity for the one-pot, microwave-a...

A novel and efficient method for the synthesis of N,N-dialkylaminoisopropyl- and O-alkylisopropyl-2-(1-alkyl-2-oxopropylidene)phosphonohydrazido oximes (4) using activated silica as dehydrating agent has been developed. The reaction involves the condensation of substituted diacetyl monoxime and N,N-dialkylaminoisopropyl-phosphono hydrazide or O-alkylisopropylphosphono hydrazides and gave the co...

The measurement of blood urea nitrogen (BUN) as serum or plasma urea is one of the most frequently ordered laboratory tests for evaluating renal functions. Conventional analysis of reactions of urea with diacetyl monoxime or urease with the Berthelot reaction [1] is rapidly giving way to the totally enzymatic reactions that are more convenient to perform and more easily adapted to modern instru...

The N-chloroacetyl and N-acetyl derivatives of some thirty racemic amino acids have been employed as starting materials for the subsequent enzymatic separation of the compounds into their opt.ical enantiomorphs (l-3).’ The procedure was always conducted in the absence of added buffer salts, the pH being set at 7 to 8 by addition of alkali to the aqueous solutions of the substrates. At the concl...

Odorant receptors of zebrafish and C elegans were functionally expressed in vertebrate kidney cells (HEK293) using the eucaryotic expression vector pSMyc. Receptor-encoding cDNA cloned into this vector was expressed as a fusion protein with the N-terminal membrane import sequence of the guinea-pig serotonin receptor followed by a myc tag. Immunocytochemical evidence indicates that this strategy...

The synthesis of the cationic gold(i) complexes [Au(C[triple bond, length as m-dash]CC5H4N)(CH3-PTA)]X (X = I, 1; X = OTf, 4), [Au(C[triple bond, length as m-dash]CC5H4N-CH3)(PTA)]X (X = I, 2; X = OTf = 5; PTA = 1,3,5-triaza-7-phosphatricyclo[3.3.1.13.7]decane) and [Au(C[triple bond, length as m-dash]CC5H4N-CH3)(DAPTA)]X (X = I, 3; X = OTf = 6, DAPTA = 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo...

Irradiation of an acetonitrile solution of 4-aryl-3,5-dibenzoyl-1,4-dihydropyridine derivatives 1a-c and maleimides 2a-c using medium pressure Hg-arc lamp (λ > 290) nm afforded three different cycloadducts 4, 5, 6 in addition to the oxidation products 3. These results indicate that compounds 1a-c undergoes intermolecular cycloaddition reaction through three biradical intermediates and behave ph...

Sweet cream liquid buttermilk and skimmed milk ingredients were heat processed and/or exposed to fluorescent light to determine changes in potential flavor compounds. Solid phase microextraction-gas chromatography/flame ionization detection was used to analyze the concentrations of the volatile compounds (2-butanone, 2-pentanone, acetaldehyde, diacetyl, hexanal, methyl sulfide) found in the two...