A Convergent Synthesis of (�)-?- and ?-Himachalenes
摘要:
Abstract(±)‐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.
Novel palladium nanoparticles supported on mesoporous natural phosphate: Catalytic ability for the preparation of aromatic hydrocarbons from natural terpenes
作者:Ayoub Abdelkader Mekkaoui、Abderrazak Aberkouks、Lahcen Fkhar、Mustapha Ait Ali、Larbi El Firdoussi、Soufiane El Houssame
DOI:10.1002/aoc.5917
日期:2020.11
Various ratios of palladiumnanoparticlessupported on mesoporousnaturalphosphate (Pd@NP) were prepared using the wetness impregnation method. The prepared catalysts were characterized by IR, XRD, CV, SEM, EDX, XRF, TEM and BET analysis. The reduction and preparation of the palladiumnanoparticles afford a crystallite size of 10.88 nm. The performance of the synthesized catalyst was investigated in
Sesquiterpene Synthases from Grand Fir (Abies grandis)
作者:Christopher L. Steele、John Crock、Jörg Bohlmann、Rodney Croteau
DOI:10.1074/jbc.273.4.2078
日期:1998.1
Grandfir (Abiesgrandis) has been developed as a model system for the study of oleoresin production in response to stem wounding and insect attack. The turpentine fraction of the oleoresin was shown to contain at least 38 sesquiterpenes that represent 12.5% of the turpentine, with the monoterpenes comprising the remainder. Assays of cell-free extracts from grandfir stem with farnesyl diphosphate
Piers, Edward; Ruediger, Edward H., Canadian Journal of Chemistry, 1983, vol. 61, p. 1239 - 1247
作者:Piers, Edward、Ruediger, Edward H.
DOI:——
日期:——
Epoxydation aerobique des terpenes naturels: etude de l'activité catalytique des nouveaux complexes Ru-1,2,4-triazepines
作者:Naı̈ma Fdil、My Youssef Ait Itto、Mustapha Ait Ali、Abdellah Karim、Jean-Claude Daran
DOI:10.1016/s0040-4039(02)02072-5
日期:2002.11
Aerobic epoxidation of a range of natural terpenic olefines was carried out by using the triazepinic complexes [RuCl(TAZO)(p-cymene)](2) C-2 and [Ru(TAZS)(p-cymene)](2) C-2, recently prepared from [RuCl2(p-cymene)](2) and the corresponding 1,2,4-triazepines (HTAZO and H(2)TAZS). While, good similar stereoselectivity was observed for the two complexes, C-1, was shown to be more effective and chemioselective. (C) 2002 Elsevier Science Ltd. All rights reserved.
Photochemical synthesis. XXV. Photochemical cycloaddition. Some applications of the use of enolized .beta.-diketones
作者:B. D. Challand、H. Hikino、G. Kornis、G. Lange、P. De Mayo