Canali, L Song, CE Sherrington, DC 2024-01-21T17:12:24Z 2024-01-21T17:12:24Z 2022-01-11 1998-03-27 0957-4166 https://pubs.kist.re.kr/handle/201004/143172 Careful work-up and purification of purported copolymers formed by free radical copolymerisation of a bis-cinchona alkaloid with methyl methacrylate shows that the level of incorporation of the bis-alkaloid into the polymer skeleton is below the detection limit of a routine nitrogen microanalytical protocol. This reluctance of the C=C bonds in the bis-alkaloid to undergo copolymerisation with a methacrylate monomer is totally consistent with the well-known and extensively documented poor copolymerizability of allylic monomers. Direct free radical copolymerisation of allyl groups containing alkaloids and other allyl substituted optically active ligands is not therefore a general and simple option for the production of polymer-supported asymmetric catalysts. (C) 1998 Elsevier Science Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD CATALYSTS OLEFINS Polymer-supported bis-cinchona alkaloid ligands for asymmetric dihydroxylation of alkenes - a cautionary tale Article 10.1016/S0957-4166(98)00062-7 1 TETRAHEDRON-ASYMMETRY, v.9, no.6, pp.1029 - 1034 TETRAHEDRON-ASYMMETRY 9 6 1029 1034 scie scopus 000072825200018 2-s2.0-0344269323 Chemistry, Inorganic & Nuclear Chemistry, Organic Chemistry, Physical Chemistry Article CATALYSTS OLEFINS