149209-56-3

Upstream product

• 145241-20-9 (S)-1-Ethyl-3,3,4-trimethyl-cyclopentene 
• 153060-95-8 (+)-(1S,5S)-2,5,6,6-tetramethylcyclohex-2-ene-1-methanol 
• 140632-38-8 (+)-(3R,7S)-4,7,8,8-tetramethyl-1-oxaspiro<2.5>oct-4-ene 
• 203245-69-6 (2R,3S,7S,8aR)-8a-Ethyl-3,6,6,7-tetramethyl-2-phenyl-hexahydro-oxazolo[3,2-a]pyridin-5-ol 
• 203245-62-9 (S)-2,2,3-Trimethyl-5-oxo-heptanal 

Relevant academic research and scientific papers

Preparation of Optically Active Cyclohexenones: Chirons for the Lipophilic Moiety of Flowery- and Woody-like Odorant Ketones

Optically active 2,5,6,6- and 2,4,4,5-tetralkylcyclohex-2-en-1-ones ((+)-2a-d and (-)-5a-d), important building blocks for flowery- and woody-like odorants, have been prepared.Compounds (+)-2a-d and (-)-5a-d were obtained by ozonolysis of the correspondin

Preparation of Optically Active Flowery and Woody-Like Odorant Ketones via Corey-Chaykovsky Oxiranylation: Irones and Analogues

α-, β-, and γ-Irones and analogues have been prepared from optically active (+)-1, (+)-6a,b, and (+)-17, via a Corey-Chaykovsky oxiranylation (Me2S, Me2SO4, Me2SO, NaOH) followed by isomerisation (SnCl4 or MgBr2). (+)-Dihydrocyclocitral (19a), obtained from (-)-citronellal, and analogue (+)-19b, were condensed with various ketones to afford (+)-21a-f, and after hydrogenation (+)-22a-f.A mild oxidative degradation of aldehydes (+)-trans- and (-)-cis-8a,b to ketones (-)-16a,b, as well as olfactive evaluations, 13C-NMR assignments, and absolute configurations of the intermediate epoxides, aldehydes, and alcohols are presented.