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benzaldehyde, etc ; Mentha spicata; almonds; carvone; cinnamon; enantioselectivity; industry; markets; metabolites; perfumes; stable isotopes; Show all 11 Subjects
Abstract:
... Natural plant extracts are primarily used as raw materials in the cosmetic and perfumery industry. However, adulterations with petrochemical products are occurring in the market, leading to non-100% natural products. Several analytical techniques such as impurity detection or enantioselective ratio assessments have been previously described as good indicators to detect any addition of synthetic pr ...
benzaldehyde, etc ; acid tolerance; catalysts; catalytic activity; corrosion; ligands; magnetic separation; magnetism; mass transfer; methanol; nanoparticles; polymers; salt concentration; Show all 13 Subjects
Abstract:
... Novel reusable acid-resistant magnetic polymer nanospheres-immobilized MIL-100 (CoFe₂O₄@Polymer@MIL-100) catalyst was prepared by a layer-by-layer method to achieve a controllable structure. The obtained core-shell catalyst consisted of modified magnetic nanoparticles as the core, a carboxylic-functionalized polymer as the protective layer, and an MIL-100 shell as the active catalytic layer by che ...
... The growth-promoting ability with the organic fertilizers especially humic substance-based products, it has caused their use to be considered. This research aimed to investigate the effect of foliar application of humic and fulvic acids on essential oil compositions and antioxidant activity of yarrow (Achillea millefolium L.) based on Principal Component Analysis (PCA) and calculating the selectio ...
... Herein, we report a Pd-catalyzed regiospecific cycloaromatization of β-bromoenal and vinyl borate esters to synthesize m-alkenyl substituted benzaldehydes. This allows the construction of complex molecules from simple materials, which may be useful in the search for new optical materials. ...
benzaldehyde, etc ; catalytic activity; cost effectiveness; Show all 3 Subjects
Abstract:
... Described here is the chromium-catalyzed cleavage of C(aryl)–SMe bonds leading to coupling with organomagnesium to give functionalized benzaldehydes under mild conditions. This reaction was promoted specifically by a low-cost and simple CrCl₂ salt used as a precatalyst, enabling synchronous activations of ortho-C(aryl)–SMe and ortho′-C(aryl)–H bonds to achieve difunctionalization of benzaldimines. ...
benzaldehyde, etc ; byproducts; hydrogen; oxidation; oxygen; Show all 5 Subjects
Abstract:
... Here a palladium-catalyzed oxidation method for converting alkylarenes into the aromatic ketones or benzaldehydes with water as the only oxygen donor is reported. This C–H bond oxidation functionalization does not require other oxidants and hydrogen acceptors, and H₂ is the only byproduct. The oxygen atom introduced into the products is confirmed to be from water by the MS analysis on the product ...
benzaldehyde, etc ; chemiluminescence; flavor; oxidants; thiourea; Show all 5 Subjects
Abstract:
... Uniquely, thiourea dioxide not only can reduce carbonyl compounds but also generate an oxidant to trigger luminol chemiluminescence. Herein, derivatization-free carbonyl compound detection using bifunctional chemiluminescence coreactant thiourea dioxide has been developed for the first time with the second most crucial flavor benzaldehyde as a representative. ...
benzaldehyde, etc ; alcohols; diastereoselectivity; salting; salts; Show all 5 Subjects
Abstract:
... Pericyclic processes such as [3,3]-sigmatropic rearrangements leading to the rapid generation of molecular complexity constitute highly valuable tools in organic synthesis. Herein, we report the formation of particularly hindered tertiary alcohols via rearrangement of Breslow intermediates formed in situ from readily available N-allyl thiazolium salts and benzaldehyde derivatives. Experimental mec ...
benzaldehyde, etc ; ammonia; formaldehyde; hydrolysis; magnetism; Show all 5 Subjects
Abstract:
... Herein we report two separate ¹⁹F magnetic resonance (MR) probes responsive towards formaldehyde. Both agents were synthesized in a single step via aminoallylation of either 4-fluorobenzaldehyde (1FA) or 4-(trifluoromethyl)benzaldehyde (3FA) with ammonia and allylboronic acid pinacol ester. Condensation of the resulting homoallylic amines 1FA and 3FA with formaldehyde, followed by a 2-aza-Cope rea ...
benzaldehyde, etc ; hydrazides; imines; light; photocatalysts; sulfates; Show all 6 Subjects
Abstract:
... We report herein an efficient three-component photoredox-catalyzed Petasis reaction. Under the optimized conditions using [Ir{dFCF₃PPy}₂(dtbpy)]PF₆ as the photocatalyst, a wide range of sulfonamides, amides and hydrazides can efficiently undergo imine formation with various benzaldehydes followed by radical α-alkylation with alkyltrifluoroborates in presence of sodium hydrogen sulfate. The operati ...
benzaldehyde, etc ; alkenes; carbon-hydrogen bond activation; isomerization; Show all 4 Subjects
Abstract:
... An Ir-catalyzed reaction of N-benzylideneanilines with functionalized alkenes such as α,β-unsaturated esters gave ortho-substituted benzaldehyde derivatives with a functional group at the remote position after acidic treatment. The present transformation involves deconjugative long-range isomerization (chain-walking) up to 11 times and C–H activation using an imino group as a transient directing g ...
benzaldehyde, etc ; catalytic activity; macropores; polystyrenes; porous media; Show all 5 Subjects
Abstract:
... Hierarchically porous metal–organic frameworks (HP-MOFs) are promising in many applications. However, most previous studies focus on HP-MOFs with two kinds of pore structures. Herein, a strategy for efficient construction of HP-MOFs possessing macro-meso-micropores using template-assisted spray drying followed by etching process is proposed. Taking ZIF-8 as an example, using polystyrene (PS) templ ...
benzaldehyde, etc ; Influenza A virus; Lewis acids; models; Show all 4 Subjects
Abstract:
... Photo-caged benzaldehyde probes using o-nitrophenylethylene glycol were designed for photo-activated electrophile generation. Using photo-activated electrophile generating probes, we successfully revealed under-represented host cell response factors using an avian influenza virus infection model. ...
benzaldehyde, etc ; Lewis acids; alcohols; indans; organic chemistry; Show all 5 Subjects
Abstract:
... The reactivity of o-propargyl alcohol benzaldehydes has been increased tremendously toward Brønsted acid-catalyzed intramolecular electrophile intercepted Meyer–Schuster (M–S) rearrangement under acetalization conditions using trimethyl orthoformate (TMOF). The in situ formed acetal transfers the methoxy group intramolecularly to generate the M–S intermediate in even less reactive substrates, and ...
benzaldehyde, etc ; benzyl alcohol; light; oxidants; oxidation; oxygen; photocatalysis; Show all 7 Subjects
Abstract:
... The oxygen vacancies could efficiently drive the photocatalytic oxidation of aromatic alcohol through the activation of reactants. However, the activation between aromatic alcohol and O₂ (oxidant) over oxygen vacancies is rarely studied. Herein, the ZnIn₂S₄/MIL-121 heterostructure with abundant surface uncoordinated carboxyl was rationally designed for benzyl alcohol (BA) oxidation under visible l ...
benzaldehyde, etc ; adsorption; biomass; density functional theory; energy; molecular weight; Show all 6 Subjects
Abstract:
... Electroreductive CO coupling provides a prospective strategy for biomass derivative upgrading via reducing the number of oxygen-containing functional groups and increasing their molecular weight. However, exploring superior electrocatalysts with effective reactivity and high selectivity for target products are still a challenge. In this work, single atom Au surface derived NiMn₂O₄ (SACs Au−NiMn₂O₄ ...
benzaldehyde, etc ; density functional theory; hydrogen bonding; organic chemistry; zwitterions; Show all 5 Subjects
Abstract:
... The mechanism of formation of the Breslow intermediate (BI) under aprotic conditions is investigated with density functional theory (DFT) calculations. The zwitterionic adduct (ZA) is formed by the first addition of an imidazolinylidene to benzaldehyde. The forward reaction is found to proceed through the second addition of the ZA to another benzaldehyde, and subsequent proton migration gives a he ...
benzaldehyde, etc ; Grignard reagents; carbon dioxide; diastereoselectivity; magnesium chloride; titanium; Show all 6 Subjects
Abstract:
... We report a Ti(OiPr)₄-mediated multicomponent reaction, which produces 3,4-substituted cis-δ-lactones from alkyl magnesium chloride, benzaldehyde and CO₂. The key intermediate, titanacyclopropane, is formed in situ from Ti(OiPr)₄ and a Grignard reagent, which enables 1,2-dinucleophilic reactivity that is used to insert carbon dioxide and an aldehyde. An alternative reaction route is also described ...
benzaldehyde, etc ; alkylation; carbon-hydrogen bond activation; catalysts; chelation; furans; Show all 6 Subjects
Abstract:
... A Ru(II)-catalyzed decarbonylative alkylation and annulation of salicylaldehydes and 2-aminobenzaldehydes with iodonium ylides has been developed for the synthesis of dibenzo[b,d]furans and NH-free carbazolones. The reaction proceeds smoothly under mild conditions with a low catalyst loading and a broad substrate compatibility. Notably, hydroxy and free amino groups were demonstrated to be the eff ...
benzaldehyde, etc ; adsorption; benzoic acid; hydrogen; oxygen; photocatalysis; photocatalysts; toluene; toxicity; Show all 9 Subjects
Abstract:
... Improving the selectivity of photocatalysis and reducing the generation of toxic by-products are the two key challenges for the development of highly efficient and stable photocatalysts. In this work, it was revealed that Zn-Ti-layered double hydroxide (ZT-LDH) photocatalyst, which generated less intermediates, showed better toluene degradation efficiency (removal ratio, 75.2%) and stability, comp ...