methyl tetra - 0-methyl- ?-d- glucopyranoside is stereoselectively prepared from tetramethyl-d- glucopyranose by using (mei+nah) in toluene (86%) or cyclohexane (85%), while its ?- isomer is best synthesized in hexamethyl phosphoramide (64%). similarly, methyl tetra-o-methyl-?- d-mannopyranoside is synthesized in cyclohexane (80%), while its ?- isomer is predominantly prepared by (mei+n-buli) i...

stinging nettle (urtica dioica l.,) is a medicinal herb commonly used by humans. the role of reactive oxygen metabolites on cancer etiology is known. there are some studies about the antioxidant effects of urtica dioica (ud) on therapy of some cancer types. this study aimed to investigate the effects of ud on antioxidant enzyme activities and mammary gland cancer induced by in rats-n-methyl-n-n...

ME T H Y L N P R O P Y L ETHER is an isomer of di-ethyl ether and possesses the formula CHs-O(CHI)J-CHJ. The physical properties of the two drugs are similar, and the vapour pressure curve of methyl-n-propyl ether is such that it may be used in the Oxford Vaporizer No. 1 without any alteration in the calibration of the instrument (see Figure). Methyl-n-propyl ether has a very unpleasant pungent...

The asymmetric unit of the title compound, C(8)H(7)N(3)O(5), contains two independent mol-ecules in which the amide plane is oriented at dihedral angles of 29.82 (2) and 31.17 (2)° with respect to the benzene ring. In the crystal, mol-ecules are connected via inter-molecular N-H⋯O hydrogen bonds, forming chains running along the b axis.

A simple, but sensitive and specific high-performance liquid chromatographic assay for the simultaneous determination of the major constituents of "ecstasy" [i.e. 3,4-methylenedioxymethamphetamine (MDMA), 3,4-methylenedioxyamphetamine (MDA), 3,4-methylenedioxyethylamphetamine (MDE)] with direct fluorimetric detection, particularly intended for the routine analysis of hair, is described. Hair sa...

In the title compound, C(13)H(13)NO(2)S, the dihedral angle between the aromatic rings is 68.4 (1)°. In the crystal, the molecules are linked into inversion dimers by pairs of N-H⋯O hydrogen bonds. The unit cell of this compound was reported previously [Oh et al. (1985 ▶). Chung. Kwa. Yong. (Chung. J. Sci.), 12, 67] but no atomic coordinates were established in the earlier study.

The cyclization of b-anilino propionic acids in the presence of polyphosphoric acid (PPA) afforded the 2,3-Dihydroquinoline-4-(1H)-ones in good yields. N,N'-bis(2-carboxyethyl)-4-methyl-1,2-diaminobenzene (7) is cyclized under this condition to produce the 1,5-diaza-2,3,6,7-tetrahydro-4-methyl-pheranthrene-4,8-dione(bis-quinolone) (8).

In the structure of the title compound, C(11)H(13)NO(3), the conformations of the N-H and C=O bonds in the amide fragment are trans to each other. In the crystal, mol-ecules are linked into a 2(1) helical chain that propagates along the c axis through N-H⋯O inter-actions.