acetophenone/dichloromethane

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Antimicrobial prenylated acetophenones from berries of Harrisonia abyssinica.

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Ielogoties Reģistrēties

The ripe berries of Harrisonia abyssinica yielded two new prenylated acetophenones, namely 5-(ethan-1'''-one)-4,6-dihydroxy-7-(3'',3''-dimethylallyl)-2 S-(1' S-hydroxy-1',5'-dimethylhex-4'-enyl)-2,3-dihydrobenzofuran (1) and 5-(2'''-hydroxyethan-1'''-one)-4,6-dihydroxy-7-(3'',3''-dimethylallyl)-2

Acetophenone-based linker for solid-phase peptide synthesis.

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Ielogoties Reģistrēties

A new and cost-effective linker for the generation of carboxylic acid end groups on Multipin supports (SynPhase crowns) has been developed. Synthesis of the linker was based on modification of grafted polystyrene (PS) crowns to generate a hydroxyethyl moiety which is acid labile in 10-20%

Tetranuclear MnII, CoII, CuII and ZnII grid complexes of an unsymmetrical ditopic ligand: synthesis, structure, redox and magnetic properties.

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Synthesis towards the preparation of an unsymmetrical binucleating Schiff-base ligand, (H₂L) is discussed. It has been synthesized by reacting methyl 6-(hydrazinecarbonyl)picolinate with 2-hydroxy acetophenone. The ligand (H₂L) comprises two different asymmetric binding

Chalcone-based molecules: Experimental and theoretical studies on the two-photon absorption and molecular first hyperpolarizability.

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Five chalcone-based molecules denominated by C-3 ((E)-1-(4-methoxyphenyl)-3-phenylprop-2-en-1-one), C-4 ((E)-1,3-bis(4-methoxyphenyl)prop-2-en-1-one), C-5 ((E)-1-(benzo[d][1,3]dioxol-5-yl)-3-(4-methoxyphenyl)prop-2-en-1-one), C-6 ((E)-3-(naphthalen-1-yl)-1-phenylprop-2-en-1-one) and C-7

Designing the "search pathway" in the development of a new class of highly efficient stereoselective hydrosilylation catalysts.

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Ielogoties Reģistrēties

The direct coupling of oxazolines and N-heterocyclic carbenes leads to chelating C,N ancillary ligands for asymmetric catalysis that combine both an "anchor" unit and a stereodirecting element. Reacting various N-substituted imidazoles with 2-bromo-4(S)-tert-butyl- and

New chiral ruthenium(II) catalysts containing 2,6-bis(4'-(R)-phenyloxazolin-2'-yl)pyridine (Ph-pybox) ligands for highly enantioselective transfer hydrogenation of ketones.

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Ielogoties Reģistrēties

Treatment of complex trans-[RuCl(2)(eta(2)-C(2)H(4))[kappa(3)-N,N,N-(R,R)-Ph-pybox]] [(R,R)-Ph-pybox = 2,6-bis[4'-(R)-phenyloxazolin-2'-yl]pyridine] with phosphines or phosphites in dichloromethane at 50 degrees C leads to the formation of novel ruthenium(II)-pybox complexes

UHPLC-MS Metabolome Fingerprinting: The Isolation of Main Compounds and Antioxidant Activity of the Andean Species Tetraglochin ameghinoi (Speg.) Speg.

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Ielogoties Reģistrēties

The seriated extracts of petroleum ether (PE-E), dichloromethane (DCM-E) and methanol extracts (MeOH-E) from the aerial parts of the native South American plant Tetraglochin ameghinoi (Rosaceae), were evaluated regarding their antioxidant and antibacterial activities. The antioxidant properties were

Active components from Artemisia iwayomogi displaying ONOO(-) scavenging activity.

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Ielogoties Reģistrēties

Peroxynitrite (ONOO(-)) is one of cytotoxic species produced by the reaction between superoxide (*O(2) (-)) and nitric oxide (NO). The main aim of this study was to identify ONOO(-) scavenging constituents from herbs. Methanolic extracts derived from one hundred thirty eight herbs were screened out

Polygonophenone, the first MEM-substituted natural product, from Polygonum maritimum.

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Ielogoties Reģistrēties

An unprecedented natural acetophenone, polygonophenone (1), and a new resorcinol, polygonocinol (2), were isolated from the dichloromethane and methanol extracts of Polygonum maritimum and identified as 2-hydroxy-4-[(2-methoxyethoxy)methoxy] acetophenone and 2-methyl-5-nonadecylresorcinol,

Phenolic and terpenoid compounds from Chione venosa (sw.) urban var. venosa (Bois Bandé).

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The Caribbean island of Grenada furnishes the popular aphrodisiac drug Bois Bandé, which consists of the stem bark and the roots of Chione venosa (sw.) URBAN var. venosa (Rubiaceae), a native tree growing in the islands' rain forest. The phytochemical investigation of dichloromethane and

Floral Origin Markers of Chestnut and Lime Tree Honeys.

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Ielogoties Reģistrēties

The apiculture industry is more and more interested in finding typical markers to authenticate floral origin of honeys. With this aim, some reliable volatile compounds were proposed to identify origin of lime tree and chestnut samples. A dichloromethane extraction followed by a Likens-Nickerson

Chemical composition and biological activities of extracts and essential oil of Boswellia dalzielii leaves.

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Ielogoties Reģistrēties

BACKGROUND Boswellia dalzielii Hutch. (Burseraceae) is an aromatic plant. The leaves are used for beverage flavouring. OBJECTIVE This study investigates the chemical composition and biological activities of various extracts. METHODS The essential oil was prepared via hydrodistillation.

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