A series of sterically hindered manganese porphyrins have been used to catalyse shape-selectivealkanehydroxylation, Increasing the production of primary alcohols.
Shape-selective alkane hydroxylation by metalloporphyrin catalysts
作者:Bruce R. Cook、Thomas J. Reinert、Kenneth S. Suslick
DOI:10.1021/ja00283a024
日期:1986.11
A series of manganese and iron porphyrins with sterically protected pockets are shown to be shape selective alkane hydroxylation catalysts. With iodosobenzene as oxidant, good regioselectivity is observed for hydroxylation of alkanes at the least hindered methyl group by using the very sterically hindered (5,10,15,20-tetrakis(2',4',6'-triphenylphenyl)-porphyrinato)manganese(III) acetate (MnTTPPP(OAc))
[DE] VERFAHREN ZUR HERSTELLUNG VON ASTAXANTHIN AUS ASTACIN<br/>[EN] METHOD FOR PRODUCING ASTAXANTHIN FROM ASTACIN<br/>[FR] PROCÉDÉ DE FABRICATION D'ASTAXANTHINE À PARTIR D'ASTACINE
申请人:BASF SE
公开号:WO2016023732A1
公开(公告)日:2016-02-18
Die Erfindung betrifft ein Verfahren zur stereounselektiven sowie zur stereoselektiven Synthese von Astaxanthin aus Astacin. Hierzu setzt man ein Reduktionsmittel ein, das ausgewählt ist aus der Gruppe Wasserstoffgas, einem sekundären Alkohol, Ameisensäure sowie den Salzen der Ameisensäure oder aus einem Gemisch wenigstens zweier Vertreter der vorab angegebenen Verbindungsklassen. Ein weiterer Gegenstand der Erfindung ist die Verwendung von Astacin als Ausgangsverbindung für die Synthese von Astaxanthin.
Storage-stable, non-sedimenting emulsions comprising a) 10 to 80% by weight, based on the emulsion, of one or more anti-oxidants, b) 0.25 to 10% by weight, based on the emulsion, of a surfactant in the form of a fatty acid salt of formula R-COOY, wherein R is straight chain or branched C.sub.3 -C.sub.18 alkyl or straight chain or branched C.sub.3 -C.sub.18 -alkenyl, or is phenyl(C.sub.3 -C.sub.18)alkyl, and Y is an alkali metal, which salt is prepared in situ from the fatty acid, c) 0.25 to 10% by weight, based on the emulsion, of a co-surfactant in the form of an alcohol of the general formula R'--OH, wherein R' is straight chain or branched C.sub.4 -C.sub.19 alkyl or straight chain or branched C.sub.4 -C.sub.19 alkenyl, or is phenyl(C.sub.4 -C.sub.19)alkyl, and d) water to make up 100%. The emulsions are used for stabilizing emulsion-polymerized polymers and copolymers such as ABS.
Storage-stable, non-sedimenting emulsions comprising a) 10 to 80% by weight, based on the emulsion, of one or more antioxidants, b) 0.25 to 10% by weight, based on the emulsion, of a surfactant in the form of a fatty acid salt of formula R-COOY, wherein R is straight chain or branched C.sub.3 -C.sub.18 alkyl or straight chain or branched C.sub.3 -C.sub.18 -alkenyl, or is phenyl(C.sub.3 -C.sub.18)alkyl, and Y is an alkali metal, which salt is prepared in situ from the fatty acid, c) 0.25 to 10% by weight, based on the emulsion, of a co-surfactant in the form of an alcohol of the general formula R'--OH, wherein R' is straight chain or branched C.sub.4 -C.sub.19 alkyl or straight chain or branched C.sub.4 -C.sub.19 alkenyl, or is phenyl(C.sub.4 -C.sub.19)alkyl, and d) water to make up 100%. The emulsion are used for stabilizing emulsion-polymerized polymers and copolymers such as ABS.