- Structure Elucidation of C10H14-Dehydroterpenes by Reaction Gas-Chromatography. - Identification of New Terpene Constituents in Essential Oils
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Alumina-catalyzed dehydration of C10H16O-monoterpene alcohols and elimination of acetic acid from C10H15OCOCH3-monoterpene acetates were carried out in the injection port of a gas chromatograph.The C10H14-monoterpene hydrocarbons formed were analyzed by gas chromatography and mass spectrometry.By means of this reaction gas chromatographic technique, verbenene (7) and 1,5,8-p-menthatriene (13) were identified unequivocally, for the first time, as constituents of essential oils.
- Kobold, Uwe,Vostrowsky, Otto,Bestmann, Hans Juergen,Kubeczka, Karl Heinz
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p. 557 - 560
(2007/10/02)
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- NUCLEOPHILIC THIYLATION OF ALLYL HALIDES IN THE PRESENCE OF PHASE-TRANSFER CATALYSTS
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A study was carried out on the thiylation of allyl halides by sodium sulfide nonahydrate and 1-butanethiol in the presence of tetrabutylammonium bromide and polyglycol as phase-transfer catalysts leading to the formation of allyl sulfides.The physical constants, spectra characteristics and yields are given for the thiylation products.
- Tolstikov, G. A.,Kanzafarov, F. Ya.,Kanzafarova, S. C.,Singizova, V. Kh.
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p. 1261 - 1266
(2007/10/02)
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- Palladium(II)-catalyzed asymmetric oxidative cyclization of 2-allylphenols in the presence of copper(II) acetate and molecular oxygen. Study of the catalysis of the Wacker-type oxidation
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The intramolecular oxidative cyclization of trans-2-(2-butenyl)phenol (2) using (+)-(3,2,10-η-pinene)palladium(II) acetate (1) in the pressure of Cu(OAc)2 and O2 has been studied in order to gain insight into the catalysis of the Wacker-type oxidation. The main results obtained are as follows: (1) the catalytically active Pd(II) species which is different from complex 1 is formed during the reaction, (2) the chiral pinanyl ligand is retained by the catalyst throughout the reaction, and (3) the catalyst consists of copper and palladium linked with an acetate bridge. These results cannot be accounted for by the conventional Wacker-type catalysis involving the reoxidation of palladium(0). A hydroperoxopalladium(II) species coupled with copper(II) acetate is most likely the active catalyst in the present reaction. A mechanism for the enantioselection is also described in comparison with the results obtained by the oxidative cyclization of cis-2-(2-butenyl)phenol.
- Hosokawa, Takahiro,Uno, Tetsuyuki,Inui, Shiro,Murahashi, Shun-Ichi
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p. 2318 - 2323
(2007/10/02)
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- INVESTIGATION OF COMPOUNDS OF THE o-METHANE SERIES. XII. INVESTIGATION OF THE COMPOSITION OF THE PRODUCTS FROM PYROLYSIS OF VERBENENE
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During the pyrolysis of verbenene the opening of the cyclobutane ring occurs at the C1-C7 and C5-C7 bond with the formation of terpene compounds of the o- and p-methane series.The latter were submitted to secondary reactions of isomerization and disproportionation of hydrogen, leading to the reduction of monocyclic and bicyclic terpene and aromatic hydrocarbons and unsaturated compounds of the isobutylcyclohexane series.
- Bazyl'chik, V. V.,Fedorov, P. I.,Skakovskii, E. D.,Vinogradov, L. I.
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p. 268 - 272
(2007/10/02)
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