Co(III) catalysed asymmetric ring-opening of epichlorohydrin by salicylaldehyde derivatives: reversal of enantioselectivity and rate acceleration on addition of AlCl_3
Makaleler > Tam Makale · 2010
Yazarlar: LEMAN KARADENİZ, GAMZE KOZ, KADRİYE AYDIN, STEPHEN THOMAS ASTLEY
Turkish Journal of Chemistry, Uluslararası, Wos, 2010
DOI: 10.3906/kim-1005-607
Özet
Using asymmetric Cobalt(III) salen catalysts, the ring-opening of epichlorohydrin by 2,3-dihydroxybenzal- dehyde and 2,4- dihydroxybenzaldehyde was found to occur at the phenolic groups most distant from the aldehydic group. Switching catalysts afforded a reversal in enantioselectivity. For 2,3-dihydroxybenzaldehyde and salicylaldehyde, addition of AlCl_3 to the reaction mixture led to an increase in reaction rate without any decrease in product enantiopurity.