The present invention relates to a process for the preparation of 13-cis isomer of Vitamin A acid, commonly known as isotretinoin, in a single step.

A process for preparing an erythromycin derivative, such as roxithromycin, from the corresponding oxime is disclosed. The oxime is reacted with a metal alkoxide and results in improvements over prior art processes involving the oxime. Roxithromycin is a known anti-bacterial agent.

A process for the synthesis in solution phase of a phosphorothioate triester is provided. The process comprises the solution phase coupling of an H-phosphonate with an alcohol in the presence of a coupling agent to form an H-phosphonate diester. The H-phosphonate diester is oxidized in situ with a sulfur transfer agent to produce the phosphorothioate triester. Preferably, the H-phosphonate and alc...

The present invention provides a process for the production of two molecules of 4-aryl-2 butanols having the general formula 1 given below:Wherein R=H or glucose from the leaves of Taxus wallichiana, which comprises:(a) defatting air dried, pulverized leaves with aliphatic hydrocarbon solvents,(b) extracting the defatted leaves with chlorinated solvents and polar solvent successively at room tempe...

The water supply unit for household appliances comprises an outer fabric hose which closely surrounds a corrugated inner hose consisting of a flexible plastic material.

DERIVADOS BENZOTIAZOL DE NICOTINA O ISONICOTINA DE FORMULA IA O IB DONDE R1 ES FENILO, PIPERIDIN-1-ILO, MORFOLINILO; A ES O; R ES -(CH2)n-N(R'')-C(O)-ALQUILO, -(CH2)n-O-ALQUILO-, -(CH2)n-O-(CH2)n-O-ALQUILO, (CH2)n-MORFOLINILO, ENTRE OTROS; A ES -N(R')-; R ES ALQUILO, CICLOALQUILO C4-C6; -(CH2)n-O-ALQUILO, -(CH2)n-PIRIDINILO, -(CH2)n-PIPERIDINILO, -(CH2)n-FENILO, ENTRE OTROS; R' Y R'' SON H, ALQUIL...

A new process for the catalytic conversion of hydroxymethyl imidazoles to formylimidazoles is described. The reaction takes place in the presence of a peroxide. Formylimidazoles are important intermediate products for pharmaceutical substances.