The title compound, C(16)H(20)O(2), was synthesized to study the hydrogen-bonding inter-action of the two enanti-omers in the solid state. The racemate is made up of carboxylic acid RS dimers. Inter-molecular O-H⋯O hydrogen bonds produce centrosymmetric R(2) (2)(8) rings which dimerize the two chiral enanti-omers through their carboxyl groups. The chirality of this compound is generated by the ...

Cephalexin (1) was acylated using N-acylbenzotriazoles (3a-k') derived from various carboxylic acids including aromatic, heterocyclic and N-Pg-α-amino acid to afford N-acylcephalexins in excellent yields (82%-96%). Antibacterial screening of the novel cephalosporins revealed that all targets (4a-j) retained the antibacterial activity of cephalexin against Staphylococcus aureus (ATCC 6538). N-Ni...

The structural formula of the novel antibiotic ionophore CP-54,883 is deduced by systematic reduction from its 13C and 1H NMR spectra. The molecule consists of a polyether ring network and side chain terminated by an aromatic ring containing a phenoxy and two chlorine substituents. Based partly on an assumed analogy to corresponding regions of the similar structure nigericin-A1, the configurati...

The title compound, C(13)H(10)BrNO(4)S, belongs to the sulfonamide class of organic compounds. The two aromatic rings are inclined at 34.30 (15)° to one another, and the carboxyl substituent lies in the plane of the benzene ring to which it is bound (maximum deviation = 0.004 Å). In the crystal structure, charactersitic carboxylic acid dimers are formed through O-H⋯O hydrogen bonds. These dimer...

An inducible acetylesterase was purified from the culture medium of Aspergillus awamori strain IFO4033 growing on wheat-bran culture by ion-exchange, gel-filtration and hydrophobic-interaction chromatographies. The purified enzyme had an Mr of 31000 and contained Asn-linked oligosaccharides. The enzyme liberated acetic acid from wheat bran, hydrolysed only alpha-naphthyl acetate and propionate ...

Mycobacterium sp. strain AP1 grew with pyrene as a sole source of carbon and energy. The identification of metabolites accumulating during growth suggests that this strain initiates its attack on pyrene by either monooxygenation or dioxygenation at its C-4, C-5 positions to give trans- or cis-4,5-dihydroxy-4,5-dihydropyrene, respectively. Dehydrogenation of the latter, ortho cleavage of the res...

Metabolism and excretion of erlotinib, an orally active inhibitor of epidermal growth factor receptor tyrosine kinase, were studied in healthy male volunteers after a single oral dose of [14C]erlotinib hydrochloride (100-mg free base equivalent, approximately 91 microCi/subject). The mass balance was achieved with approximately 91% of the administered dose recovered in urine and feces. The majo...

If calixarenes can be dissolved in a relatively safe non-halogen solvent, they used liquid-liquid extraction process suitable for mass processing. In the present study, behavior of metal ions using calix[4]arene carboxylic acid derivative (tOct[4]CH2COOH) aromatic ethers was investigated. The solubility tOct[4]CH2COOH decreases with increase length aliphatic side chain ethers. 1-butoxybenzene (...

vilsmeier several diamide derivatives containing 2-chloroquinoline scaffolds were synthesized via ugi reaction of 2-chloroquinoline-3-carboxaldehydes, amines, carboxylic acids and isocyanides. the diversity of these quinolinyl ugi-adducts was increased by using 2-chloroquinoline-3-carboxylic acids as a source of acid. among them, compounds 2d, 2n, 2p, 4a, 4c and 4e displayed moderate to good an...

Anionic polyurethane dispersants APUDs were used as dispersing agents in formulation of waterborne paints. The APUDs were synthesized by three steps. In the first step, macromonomer diisocyanate having carboxylic acid was prepared by isophorone diisocyanate IPDI, dimethylol propionic acid DMPA in presence of acetone as solvent and dibutyltin dilaurate DBTDL as catalyst. Then, carboxylic polyure...