Some volatile constituents of terrestrial slaters

1966 ◽  
Vol 19 (8) ◽  
pp. 1495 ◽  
Author(s):  
GWK Cavill ◽  
DV Clark ◽  
H Hinterberger
Keyword(s):  
Porcellio Scaber ◽  
Volatile Constituents ◽  
The Common ◽  
Cis And Trans ◽  
Unsaturated Component

The common terrestrial dater, Porcellio scaber, yields a volatile extractive, slaterol, which comprises cis- and trans-dec-3-en-1-ol (80%), together with cis- and trans-non-3-en-1-ol and nonan-1-ol (5%). The remaining and unsaturated component of slaterol (A, 15%), which gives decan-1-ol on reduction, has yet to be characterized. An undescribed Armadillidium sp. yields a single constituent, octan-1-ol.

scholarly journals Characterization of a Natural, Stable, Reversible and Colourful Anthocyanidin Network from Sphagnum Moss Based Mainly on the Yellow Trans-Chalcone and Red Flavylium Cation Forms

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 709
Author(s):  
Helge Berland ◽  
Øyvind M. Andersen
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Cell Wall ◽  
Peat Moss ◽  
Sphagnum Moss ◽  
Naturally Occurring ◽  
Two Component ◽  
Colour System ◽  
The Common ◽  
Cis And Trans

Anthocyanins with various functions in nature are one of the most important sources of colours in plants. They are based on anthocyanidins or 3-deoxyanthocyanidins having in common a C15-skeleton and are unique in terms of how each anthocyanidin is involved in a network of equilibria between different forms exhibiting their own properties including colour. Sphagnorubin C (1) isolated from the cell wall of peat moss (Sphagnum sp.) was in fairly acidic and neutral dimethyl sulfoxide characterized by nuclear magnetic resonance (NMR) and ultraviolet–visible (UV–vis) absorption techniques. At equilibrium, the network of 1 behaved as a two–component colour system involving the reddish flavylium cationic and the yellow trans–chalcone forms. The additional D- and E-rings connected to the common C15-skeleton extend the π-conjugation within the molecule and provide both bathochromic shifts in the absorption spectra of the various forms as well as a low isomerization barrier between the cis- and trans-chalcone forms. The hemiketal and cis-chalcone forms were thus not observed experimentally by NMR due to their short lives. The stable, reversible network of 1 with good colour contrast between its two components has previously not been reported for other natural anthocyanins and might thus have potential in future photochromic systems. This is the first full structural characterization of any naturally occurring anthocyanin chalcone form.

scholarly journals Effects of thermal and oxygen conditions during development on cell size in the common rough woodlice Porcellio scaber

2020 ◽  
Vol 10 (17) ◽  
pp. 9552-9566 ◽  
Author(s):  
Andrzej Antoł ◽  
Anna Maria Labecka ◽  
Terézia Horváthová ◽  
Anna Sikorska ◽  
Natalia Szabla ◽  
...  
Keyword(s):  
Cell Size ◽  
Porcellio Scaber ◽  
Oxygen Conditions ◽  
The Common

The vibrational circular dichroism spectra of 2-methylaziridine: dominance of the asymmetric centre at nitrogen

1994 ◽  
Vol 72 (3) ◽  
pp. 506-513 ◽  
Author(s):  
Arvi Rauk ◽  
Thomas Eggimann ◽  
Helmut Wieser ◽  
Gennadii V. Shustov ◽  
Danya Yang
Keyword(s):  
Equilibrium Mixture ◽  
Vibrational Circular Dichroism ◽  
Basis Set ◽  
Quantum Mechanical ◽  
Coupling Theory ◽  
Similar Magnitude ◽  
Chiroptical Properties ◽  
Methyl Group ◽  
The Common ◽  
Cis And Trans

The experimental VCD spectrum of (2R)-2-methylaziridine has been measured in the region 800–1500 cm−1. The ab initio implementation of the Vibronic Coupling Theory (VCT) of Nafie and Freedman, using the 6-31G*(0.3) basis set, in the common origin and distributed origin gauges and with uniformly and optimally scaled quantum mechanical force fields, is used to investigate the chiroptical properties. VCD spectra are computed for both cis and trans invertomers. The predicted VCD spectrum of 2-methylaziridine (the equilibrium mixture) is dominated by that of the trans diastereomer, not simply because of its greater abundance but because the rotatory strengths of many absorptions in the mid-IR are oppositely signed and of similar magnitude in the two invertomers which differ in absolute configuration at nitrogen. The VCD spectrum of 2-methylaziridine is compared in detail to that of 2-methyloxirane. In the region of the methyl group deformations and CH2 scissor, the theoretical (R)-2-methyloxirane VCD spectrum displays a much closer similarity to the cis-(2R)-2-methylaziridine than to the trans diastereomer.

scholarly journals Composition variation in essential oils of Artemisia nilagirica and Artemisia capillaris, growing in India

2010 ◽  
Vol 2 (1) ◽  
pp. 30-33 ◽  
Author(s):  
Ruchi Badoni ◽  
Deepak Kumar Semwal ◽  
Usha Rawat
Keyword(s):  
Essential Oils ◽  
Chemical Constituents ◽  
Volatile Constituents ◽  
Artemisia Capillaris ◽  
Ms Analysis ◽  
Artemisia Nilagirica ◽  
Composition Variation ◽  
The Common ◽  
Garhwal Region ◽  
Asteraceae Family

The present study was aimed to find out the chemical constituents of essential oils of Artemisia nilagirica (Clarke) Pamp. and Artemisia capillaris Thunb. of Asteraceae family, growing in Garhwal region of India. The essential oils were obtained by hydro-distillation and subjected to detailed GC-MS analysis in order to determine the variation in their volatile constituents. While comparing the common constituents in both of the species, the remarkable variation was observed and it was 6.03, 3.251, 2.093, 33.73, 7.573, 15.041 and 8.00% for trans-caryophyllene, DL-limonene, α-pinene, α-thujone, β-myrcene, β-ocimene and β-thujone, respectively.

scholarly journals Chemical comparison of the underground parts of Valeriana officinalis and Valeriana turkestanica from Poland and Kazakhstan

2017 ◽  
Vol 15 (1) ◽  
pp. 75-81
Author(s):  
Olga Sermukhamedova ◽  
Agnieszka Ludwiczuk ◽  
Jarosław Widelski ◽  
Kazimierz Głowniak ◽  
Zuriyadda Sakipova ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Polyunsaturated Fatty Acids ◽  
Biological Significance ◽  
Valeric Acid ◽  
Hexane Extract ◽  
Valeriana Officinalis ◽  
Volatile Constituents ◽  
Hexane Extracts ◽  
The Common ◽  
Valerenic Acid

AbstractThe volatile constituents from the n-hexane extracts of the roots and rhizomes of Valeriana officinalis (VO) and Valeriana turkestanica (VT) were investigated by GC-MS analysis. Two VO samples were obtained from cultivation, one from commercially available material, while VT was collected in a mountain of Kazakhstan. The most characteristic components present in all of the analysed samples were sesquiterpenoids. The three investigated samples of VO produced mainly valerenane and kessane sesquiterpenoids. Acetoxyvalerenic acid (33.94%), valerenic acid (15.05%), valerenal (11.93%), valeric acid 2,6-dimethylnon-1-en-3-yn-5-yl ester (5.24%), valerenol (3.31%), elemol (3.19%) and (E)-valerenyl isovalerate (2.53%), were the common components identified in the n-hexane extract from the roots of VT. In comparison to VO this species does not produce kessane sesquiterpenoids and polyunsaturated fatty acids. This study shows that the roots of VT possess compounds of high biological significance, since they have the appropriate contents of valerenic acid and its derivatives, thus VT can be considered as a substitute for VO.

Factors influencing the catalytic activity of β-tetrabrominated meso-tetra(para-tolyl)porphyrinatomanganese(III) for oxidation of sulfides and olefins with Oxone

2011 ◽  
Vol 15 (02) ◽  
pp. 131-139 ◽  
Author(s):  
Saeed Rayati ◽  
Saeed Zakavi ◽  
Hossein Kalantari
Keyword(s):  
Catalytic Activity ◽  
Aprotic Solvents ◽  
Reaction Parameters ◽  
Oxidation Of Sulfides ◽  
Factors Influencing ◽  
Trans Stilbene ◽  
Oxidation Of Olefins ◽  
The Common ◽  
High Valent ◽  
Cis And Trans

Effect of different reaction parameters on the catalytic activity of β-tetrabrominated meso-tetra(para-tolyl)porphyrinatomanganese(III), MnT(4-CH3P)PBr4(OAc) , for oxidation of different sulfides and hydrocarbons with tetra-n-butylammonium hydrogen monopersulfate (TBAHS) has been studied. In oxidation of sulfides, the chemoselectivity of reaction has been significantly changed in THF as the solvent compared with the common organic solvents. Also, using nitrogenous bases bearing electron-withdrawing groups ( -Cl or -CN ) clearly increased the ratio of sulfoxide to sulfone relative to the electron-donating ones. Catalytic oxidation of olefins with TBAHS was conducted in protic and aprotic solvents and acetonitrile has been found as the best solvent. A significantly large difference was found between the co-catalytic activity of imidazole (ImH) and pyridine in comparison with that observed in dichloromethane. The competitive oxidation of cis- and trans-stilbene suggests the presence of a high valent manganese oxo as well as a six coordinate (ImH)MnT(4-CH3P)PBr4(HSO5) species as the active oxidants in acetonitrile.

Chemistry of the metasternal gland secretion of the common eucalypt longicorn, Phoracantha semipunctata (Coleoptera: Cerambycidae)

1972 ◽  
Vol 25 (3) ◽  
pp. 591 ◽  
Author(s):  
BP Moore ◽  
WV Brown
Keyword(s):  
Gland Secretion ◽  
Volatile Components ◽  
Phoracantha Semipunctata ◽  
The Common ◽  
Cis And Trans ◽  
Metasternal Gland

The metasternal gland secretion of Phoracantha semipunctata contains five significant volatile components, of which the most abundant is 2-hydroxy-6-methyl-benzaldehyde (1). The second most abundant component, which has been named phoraoanthol, has been shown by synthesis to be (5-ethylcyclopent-1-enyl)methanol (2). The three other components are aldehydes, derivable from phoracanthol and cis- and trans-dihydrophoracanthols, respectively. Apparently all five components are related biosynthetically.

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