extensive studies on FSO2+‐type reagents, a radicalfluorosulfonylation reaction with a fluorosulfonyl radical (FSO2.) remains elusive so far, probably owing to its instability and difficulty in generation. Herein, the development of the first radicalfluorosulfonylation of alkenes based on FSO2 radicals generated under photoredox conditions is reported. This radical approach provides a new and general access
β-Selective Epoxidation of Cholesterol Derivatives with Molecular Oxygen and Aldehyde Catalyzed by Manganese(II) Complex
作者:Tohru Yamada、Kiyomi Imagawa、Teruaki Mukaiyama
DOI:10.1246/cl.1992.2109
日期:1992.11
In the presence of a catalytic amount of bis(dipivaloylmethanato)manganese(II) (= Mn(dpm)2), various cholesterol derivatives are smoothly converted into the corresponding β-epoxides in good to high yields with combined use of molecular oxygen and isobutyraldehyde. These stereoselectivities are the reversal of the cases using peracid such as mCPBA.
Photoprotective compositions, e.g., oil-in-water or water-in-oil emulsions, well suited for the photoprotection of the skin, lips and/or hair against the damaging effects of UV-radiation, comprise at least one aqueous phase, at least one oily phase, at least one partially or completely neutralized, crosslinked or non-crosslinked water-soluble or water-dispersible acrylamido-2-methylpropanesulfonic acid (AMPS) polymer and at least one UV radiation-screening system, said at least one screening system comprising at least one 4,4-diarylbutadiene UV-A-screening agent
IONIZABLE COMPOUNDS AND COMPOSITIONS AND USES THEREOF
申请人:Nitto Denko Corporation
公开号:US20160376229A1
公开(公告)日:2016-12-29
This invention includes ionizable compounds, and compositions and methods of use thereof. The ionizable compounds can be used for making nanoparticle compositions for use in biopharmaceuticals and therapeutics. More particularly, this invention relates to compounds, compositions and methods for providing nanoparticles to encapsulate active agents, such as nucleic acid agents, and to deliver and distribute the active agents to cells, tissues, organs, and subjects.
Photoprotective compositions well suited for the photoprotection of the skin, lips and/or hair against the damaging effect of UV-radiation comprise at least one aqueous phase and at least one system for screening out UV-radiation, and which also contain:
(a) at least one partially or totally neutralized, crosslinked or non-crosslinked amphiphilic polymer of 2-acrylamidomethylpropanesulfonic acid (AMPS), and
(b) at least one water-soluble silicone comprising at least one terminal or pendent monovalent polyoxyalkylene group.