Chemical composition of Ledum palustre

Mikhailova, N. S.; Коновалова, О. А.; Rybalko, K. S.

doi:10.1007/bf00565890

Cited by 12 publications

(8 citation statements)

References 3 publications

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“…The chemical composition of the essential oils of all or separated aerial parts (mostly shoots) of Rh. tomentosum has been studied in Europe [2][3][4][5][6][7][8][9][10][11][12][13][14][15], the Far East and Siberia [16][17][18], and Asia [19][20][21][22] (Table 1). Other studies were focused on the isolation and identification of new compounds from the plant, such as 7-elemol, lepalol, lepalin, lepaloks, lepakson and lebaikon [16,17,[23][24][25][26].…”

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confidence: 99%

Composition of Seed Essential Oils of Rhododendron tomentosum

Judžentienė

Butkienė

Būdienė

et al. 2012

Natural Product Communications

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For the first time, the chemical composition of the seed essential oil of Rhododendron tomentosum was determined. Forty-seven compounds were identified, comprising 91.7% of the total oil. Palustrol (38.3%) and ledol (27.0%) were the predominant constituents. Some constituents, such as -pinene oxide, iso-menthyl acetate, nerolidyl acetate, cadalene and guaiazulene were characteristic only for the seeds and were identified for the first time in Rh. tomentosum oils. For comparison purposes, the essential oil isolated from the shoots of the same plant were analyzed [GC(FID) in combination with RIs, GC-MS and 13 C NMR]. More than a half of the oil was comprised of ledol (36.5%) and palustrol (21.0%). Quantitative analysis of ascaridol, a heat-sensitive compound, was carried out by 13 C NMR spectroscopy. Indeed, ascaridol undergoes partial thermal isomerization to iso-ascaridol during GC analyses.

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confidence: 99%

Composition of Seed Essential Oils of Rhododendron tomentosum

Judžentienė

Butkienė

Būdienė

et al. 2012

Natural Product Communications

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“… a Polarizability was calculated from the average refractive index at 589 nm and 20 °C of 1.47224 b Polarizability data were taken from literature …”

Section: Resultsmentioning

confidence: 99%

Measurement and Modeling of Phase Equilibria in Systems of Acetonitrile,n-Alkanes, and β-Myrcene

Riechert

Zeiner

Sadowski

2015

Ind. Eng. Chem. Res.

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This work presents a modeling approach using the Perturbed Chain-Statistical Associating Fluid Theory (PC-SAFT) for new liquid−liquid equilibria (LLE) data of ternary systems containing β-myrcene, acetonitrile, and n-alkanes, as well as binary mixtures thereof. The modeling approach is based on parameter estimations from binary systems and allows a general prediction of acetonitrile/n-alkane systems' LLE and their ternary mixtures' LLE with β-myrcene. The binary mixtures' vapor− liquid equilibria (VLE) of β-myrcene with acetonitrile and n-alkanes were measured at 100 mbar. The ternary systems' LLE were measured at ambient pressure and 298.15 K. Experimentally investigated alkanes are n-hexane, n-heptane, and n-octane. The approach was validated by successfully predicting the ternary system containing n-dodecane. ■ INTRODUCTIONDue to the natural limitation of fossil feedstock, terpenes (such as, e.g., myrcene) have gained significant interest in the chemical industry as renewable resources. 1 Terpenes are the main components of several resins (e.g., conifers). As conifers are perennial, modest plants, farming and exploiting is possible over several years. Because of a lack of a competition to food production, terpenes are a superior starting material compared to sugar or fatty acids. Among the terpenes, β-myrcene (myrcene, Figure 1)due to its unsaturated isoprene unitis an attractive starting substance for several reaction pathways. 2 This work focuses on homogeneously catalyzed hydroamination which is fast and selective. An atom-economic conversion of myrcene provides a sustainable way to alkyl amines on the basis of renewable feedstock. As catalysts are cost intensive, a recycling and reuse of the catalyst is preferable for an economic process design.A possible strategy to achieve catalyst recycling in homogeneous catalysis is the use of thermomorphic multicomponent solvent systems (TMS), 2b which show a temperature-dependent miscibility gap. At reaction temperature, the mixture is homogeneous. This ensures a fast bulk reaction. By cooling down to separation temperature, two liquid phases are formed. Ideally, one phase carries the catalyst, whereas the product enriches in the other one. Thereby, catalyst recycling and product removal can be achieved in one step by extraction. One promising TMS for the hydroamination of myrcene is a mixture of acetonitrile with an n-alkane, whereas the catalyst (palladium with 1,4-bis(diphenylphosphino)butane as ligand) enriches in the acetonitrile-rich phase and the alkyl amine enriches in the alkane-rich phase. Until now the homogeneouscatalyzed hydroamination has been carried out with n-heptane as one TMS component. 2b It was however shown that the catalyst leaching corresponds to the concentration of the polar compound, here acetonitrile, in the apolar alkane-rich phase. 3 As the miscibility gap of TMS composed of acetonitrile and nalkanes broadens with increasing chain length of the applied alkane, a thermodynamic modeling of the phase behavior as a function of alkane chai...

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“…It shows expectorant and antitussive potency. 52,53 Rhododendron tomentosum L. plants were usually collected at the owering stage. The essential oils were prepared via hydrodistillation of air-dried aerial parts in a Clevenger-type apparatus in accordance with the European Pharmacopoeia.…”

Section: Terpenoidsmentioning

confidence: 99%