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8371474 
Journal Article 
Aldol condensation of butan-2-one and pentan-3-one on an activated alumina as monitored via in-situ carbon-13 nuclear magnetic resonance spectroscopy 
Bell, VA; Carver, RF; Dybowski, C; Gold, HS 
1984 
1 
Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
ISSN: 0300-9599 
80 
4 
831-839 
English 
Conventional 13C nuclear magnetic resonance spectroscopy is used to monitor the reactions of butan-2-one and pentan-3-one adsorbed on alumina. Both reaction sequences proceed via successive aldol condensations. The products observed for butan-2-one (5-methyl-4-hepten-3-one and 4-hydroxy-4-methylpentan-2-one) are those expected for homogeneous base catalysis. A J-modulated spin-echo sequence demonstrates that 5-ethyl-4-methyl-5-hepten-3-one, the β, γ condensation product, is obtained using pentan-3-one. The results demonstrate that conventional 13C n.m.r. can be effectively used to distinguish reaction pathways and products for surface-catalysed reactions.