L'Avventura delle Scienze - Tomo B

Diterpenoids fromStachys mucronata

Le scienze per crescere - Edizione per progetti

Chimica dalla H alla Z. Edizione BLU - Volume BLU Dai fenomeni alle soluzioni, 1° Biennio

Comparison of the volatile oils ofHypericum scabrum L. andHypericum perforatum L. from Turkey

The composition of the volatile oils obtained from the aerial parts of Hypericum scabrum L. and H. perforatum L. was analysed by GC and GC‐MS. While the oil of H. scabrum L. contained a-pinene (71.6%), b-caryophyllene (4.8%), myrcene (3.8%), cadalene (3.4%) and b-pinene (2.9%), the oil of H. perforatum L. contained a-pinene (61.7%), 3-carene (7.5%), b-caryophyllene (5.5%), myrcene (3.6%), cadalene (3.2%) and other components. Twenty-nine and 27 terpenoid compounds have been identified in the volatile oils of H. scabrum L. and H. perforatum L., respectively. #1997 by John Wiley & Sons, Ltd.

Sesquiterpene compounds from Inula Viscosa

Two new compounds, 2,5-dihydroxyisocostic acid and 2,3-dihydroxycostic acid together with three known sesquiterpene compounds, Isocostic acid, Carabrone and Tomentosin, have been isolated from the acetone extract of Inula viscosa (L.) Aiton. The structures of all new compounds were determined by spectroscopic methods, in particular 1D and 2D (1)H- and (13)C-NMR. The (13)C-NMR spectra of Isocostic acid and of Tomentosin are reported here for the first time.

L'Avventura delle Scienze - Tomo C

Noi e La Chimica - Dalle biomolecole al metabolismo

The synthesis of nareielasie aldehyde and related lsocarbostyrils

The synthesis of several isoearboslyrils is reported, including lorrnyl derivatives at (1-4, like nareiclasie aldehyde (I) and the homologous aldehyde (XV).

La Scoperta delle Scienze - 3

La scoperta delle scienze - 2

Isomotiol, a new triterpene from strychnos potatorum

Isomotiol (fern-8-en-3β-ol) was isolated from the leaves of Strychnos potatorum; it was not known previously as a natural product, but it has been obtained by acidic isomerization of compounds with a fern-7-ene or a fern-9(11)-ene skeleton. From the leaves and the bark mixtures of sitosterol, stigmasterol and campesterol were also isolated.

L'avventura delle Scienze - Tomo D

L'avventura delle Scienze - Tomo A

Triterpenes from amaracus dictamnus

Abstract From the aerial parts of Amaracus dictamnus several triterpenes were isolated: oleanolic and ursolic acids, uvaol, the rare 21α-hydroxyoleanolic acid and a new 21α-hydroxyursolic acid.

8 β-hydroxyfruticolone, a diterpenoid from Teucrium fruticans

Il nuovo "la Materia"

Un percorso di "scienza della materia" che si occupa dello studio dei fenomeni della materia non vivente e di tutte le trasformazioni che essa può subire.

Volatile flavour components of ocimum basilicum var. hispidum (lam.) Chiov.

The volatile components obtained by steam-distillation ofOcimum basilicum var. hispidum (Lam.) Chiov. (Labiatae) were analysed by gas chromatography (GC) and gas chromatography—mass spectrometry (GC-MS). A total of 21 compounds, representing ca 90% of the total oil, were identified. The identity of the main component (82%), dihydrotagetone, was confirmed by 1H- and 13C-NMR spectroscopy. This is the first report of this compound in the genus Ocimum.

A minor diterpene from Amaracus akhdarensis

Abstract A new isopimarane diterpenoid, isoakhdartriol, was isolated in very small amount from the aerial part of Amaracus akhdarensis. Its structure, isopimar-15-en-3β,8β,19-triol, was established by spectroscopic means.

"Chimica Attiva"

Un percorso di chimica che, prendendo spunto dall'osservazione dei fenomeni, si propone di offrire un'interpretazione della struttura della materia e delle sue trasformazioni

Volatile Constituents ofTeucrium poliumL. from Turkey

Abstract The volatile constituents obtained from the aerial parts of Teucrium polium were analyzed by GC and GC/MS. The oil was found to contain 37 components, of which 30 were identified. The major constituents were β-pinene (18.0%), β-caryophyllene (17.8%), α-pinene (12.0%), caryophyllene oxide (10.0%), myrcene (6.8%) and germacrene-D (5.3%)

Chimica in Cucina

Noi e la chimica - Dalla biochimica alle nanotecnologie

La Scoperta delle Scienze - 1

"L'avventura delle scienze"

Un percorso completo di scienze naturali che intende fornire un "metodo per imparare". Il percorso cognitivo è facilitato dalla presenza di numerose espansioni online pensate per l'utilizzo della lavagna interattiva multimediale (LIM).

Kauranoid dieterpenes in Espeletia grandiflora

Abstract The resin of Espeletia grandiflora contains (-)-kaur-16-en-19-ol, (-)-kaur-16-en-19-al (not previously isolated from natural sources), (-)-kaur-16-ene and (-)-kaur-16-en-19-oic acid.