Features of the reaction of 2,3-dihalopropanoic acids with pyridines and nucleophilic addition to N-vinylpyridinium salts
摘要:
The example of vinylpyridinium salts to establish for the first time the possibility of nucleophilic addition to the vinyl group in quaternary ammonium salts, which provides evidence against the concept that such reactions involve d orbitals. The nucleophilic addition reaction was accomplished with triphenylphosphine and pyridine. In the latter case, the suggested reaction scheme was confirmed by the observation of the Wittig reaction under the action of carbon dioxide and the Stevens reaggangement involving the double bond of the pyridinium ring and migrating 2-phosphonioethyl group. Procedures for preparing the starting vinylpyridinium salts. Reaction schemes were siggested.
A composition suitable for topical application to mammalian skin and hair for inducing, maintaining or increasing hair growth comprises a hair growth promoter chosen from N-acylated amino-acids, in which the acyl group has from 2 to 20 carbon atoms, together with a cosmetically acceptable vehicle for the hair growth promoter.
Carriers, Formulations, Methods For Formulating Unstable Active Agents For External Application And Uses Thereof
申请人:Foamix Ltd.
公开号:US20130189191A1
公开(公告)日:2013-07-25
The present disclosure teaches unique formulations for topical administration of tetracycline antibiotics, in which the tetracycline antibiotics remain stable.
本公开教授了一种独特的四环素类抗生素外用给药配方,其中四环素类抗生素保持稳定。
CARRIERS, FORMULATIONS, METHODS FOR FORMULATING UNSTABLE ACTIVE AGENTS FOR EXTERNAL APPLICATION AND USES THEREOF
申请人:Tamarkin Dov
公开号:US20100310476A1
公开(公告)日:2010-12-09
The present disclosure teaches unique formulations for topical administration of tetracycline antibiotics, in which the tetracycline antibiotics remain stable.
本公开教授了独特的四环素类抗生素局部给药配方,其中四环素类抗生素保持稳定。
DRUG-CONTAINING NANOPARTICLES
申请人:Egashira Kensuke
公开号:US20100331373A1
公开(公告)日:2010-12-30
The present invention relates to nanoparticles containing pioglitazone or a salt thereof and a biocompatible polymer, a pharmaceutical preparation containing the nanoparticles for the prophylaxis or treatment of arteriosclerotic diseases, and a stent carrying the nanoparticles. Using the nanoparticles of the present invention, rupture of arteriosclerotic plaque can be suppressed, and they are useful for the prophylaxis or treatment of arteriosclerotic diseases.
An aqueous single phase composition, particularly for use in the treatment of keratinous fibres, comprises a cationic polymer or mixtures thereof, an anionic monomer or mixtures thereof, and a solubilising agent chosen from amphoteric detergent active compounds, inorganic electrolytes and mixtures thereof. The composition should have an anionic to cationic charge ratio of from 0.2 to 1.0. When the monomer is an anionic dye, the composition can be employed in the dyeing of hair.