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Trimerisation of the Cationic Fragments [( η ‐ring)M(Aa)] + (( η ‐ring) M=( η 5 ‐C 5 Me 5 )Rh, ( η 5 ‐C 5 Me 5 )Ir, ( η 6 ‐ p ‐MeC 6 H 4 i Pr)Ru; Aa= α ‐amino acidate) with Chiral Self‐Recognition: Synthesis, Characterisation, Solution Studies and Catalytic Reactions of the Trimers [{( η ‐ring)M(Aa)} 3 ](BF 4 ) 3
Author(s) -
Carmona Daniel,
Lahoz Fernando J.,
Atencio Reinaldo,
Oro Luis A.,
Lamata M. Pilar,
Viguri Fernando,
San José Emilio,
Vega Cristina,
Reyes Josefa,
Joó Ferenc,
Kathó Ágnes
Publication year - 1999
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/(sici)1521-3765(19990503)5:5<1544::aid-chem1544>3.0.co;2-t
Subject(s) - acetophenone , cationic polymerization , chemistry , ring (chemistry) , diastereomer , stereochemistry , metal , medicinal chemistry , polymer chemistry , catalysis , organic chemistry
The formation of [{( η ‐ring)M(Aa)} 3 ](BF 4 ) 3 trimers [( η ‐ring)M=( η 5 ‐C 5 Me 5 )Rh, ( η 5 ‐C 5 Me 5 )Ir, ( η 6 ‐ p ‐MeC 6 H 4 i Pr)Ru; Aa = α ‐amino acidate, one cation shown schematically] takes place by chiral self‐recognition, the R M R M R M or S M S M S M trimers are equally configurated at the metal centres and are the only diastereomers detected. The equilibrium constant for the diastereomerisation process between both isomers depends on the solvent, amino acidate, and metal. The trimers catalyse the reduction of unsaturated aldehydes to unsaturated alcohols and the reduction of acetophenone to 2‐phenylethanol with up to 75 % ee .