Baker's yeast mediated synthesis of (5SR, 9S)-5,9-dimethyl-heptadecane and (5SR, 9S)-5,9-dimethyl pentadecane; the main sex-pheromone components of Leucoptera scitella and Perileucoptera coffeella enriched in 9S-isomers
摘要:
A mixture of (5S, 9S)-5,9-dimethyl heptadecane (1a), the main sex-pheromone component of Leucoptera scitella, and its (5R, 9S)-isomer (2a) was synthesized conveniently from (R)-citronellal (4, obtained from racemic citronellal by enantiomer selective baker's yeast reduction) in four steps.(5SR, 9S)-5,9-Dimethyl-pentadecane (mixture of 1b and 2b), a possible sex-attractant of Perileucoptera coffeella was prepared analogously.
Baker's yeast mediated synthesis of (5SR, 9S)-5,9-dimethyl-heptadecane and (5SR, 9S)-5,9-dimethyl pentadecane; the main sex-pheromone components of Leucoptera scitella and Perileucoptera coffeella enriched in 9S-isomers
摘要:
A mixture of (5S, 9S)-5,9-dimethyl heptadecane (1a), the main sex-pheromone component of Leucoptera scitella, and its (5R, 9S)-isomer (2a) was synthesized conveniently from (R)-citronellal (4, obtained from racemic citronellal by enantiomer selective baker's yeast reduction) in four steps.(5SR, 9S)-5,9-Dimethyl-pentadecane (mixture of 1b and 2b), a possible sex-attractant of Perileucoptera coffeella was prepared analogously.
Chiral discrimination of saturatedhydrocarbons has been very difficult to establish, or has not been possible at all. The first chiral discrimination of cryptochiral 5-ethyl-5-propylundecane 1, that is, (n-butyl)ethyl(n-hexyl)(n-propyl)methane, a chiral saturated quaternary hydrocarbon, which is known to exhibit practically no detectable value of optical rotation between 280 and 580 nm, has been accomplished