15 research outputs found
2-Acetyl-3,5,5,9-tetraÂmethyl-6,7,8,9-tetraÂhydro-5H-benzocycloÂhepten-7-one
The title compound, C17H22O2, was semi-synthesized from a mixture of α-atlantone (Z) and α-atlantone (E), which were isolated from the essential oil of the Atlas cedar (cedrus atlantica). The molÂecule consists of fused six- and seven-membered rings. The seven-membered ring is in a screw-boat conformation
Undersökning av de extraherbara beståndsdelarna av ved från vanlig en. (Juniperus communis L.)
A Convergent Synthesis of (�)-?- and ?-Himachalenes
(±)-α and β-Himachalene, 5 and 6, have been synthesized in a convergent manner from 3,3-dimethylacrolein (9), the ester enolate 10 and the silyloxypentadienyllithium 7. The key steps are the regioselective γ-addition of the dienal 13 to 7 and the intramolecular Diels-Alder addition 15 → 16. Hydrogenolysis of the diethylphosphate group and functionalization at C (5) completed the synthesis of 5 and 6.</p