Chiral Brønsted Acid‐Catalyzed Asymmetric 1,4‐Addition of Benzofuran‐Derived Azadienes with 3‐Substituted indoles
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DOI: 10.1002/cctc.202000810
Abstract: A chiral phosphoric acid‐catalyzed asymmetric 1,4‐addition of benzofuran‐derived azadienes with 3‐substituted indoles has been established, which offered enantioenriched tri(hetero)arylmethane products in generally good yields (up to 98 %) and high enantioselectivities (up to 99 : 1 er). This reaction… read more here.
Keywords: derived azadienes; catalyzed asymmetric; benzofuran derived; acid catalyzed ... See more keywords
Palladium/Carboxylic Acid‐catalyzed Alkenylation of Furfural and its Derivatives Using Alkynes
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DOI: 10.1002/cctc.202001685
Abstract: Furfural and its derivatives underwent alkenylation with alkynes via α‐C−H activation in the presence of a palladium/carboxylic acid catalyst to give the corresponding single and double alkenylated products. The reactive aldehyde group remained intact during… read more here.
Keywords: carboxylic acid; acid catalyzed; furfural derivatives; palladium carboxylic ... See more keywords
Chiral Brønsted acid catalyzed asymmetric oxidation of N-acyl sulfenamide by H2 O2 : An efficient approach to obtaining chiral N-acyl sulfinamide.
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DOI: 10.1002/chir.23478
Abstract: Although the power of chiral sulfinamide reagents in synthetic chemistry has long been recognized, methods for their synthesis are still auxiliary-based approaches which possess the disadvantages of poor atom economy and limited substrate universality. Due… read more here.
Keywords: chiral nsted; catalyzed asymmetric; nsted acid; acid ... See more keywords
ACID-CATALYZED REARRANGEMENT OF 1-ACYL-2-AZABUTA-1,3-DIENES TO 4-PYRROLIN-2-ONES
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DOI: 10.1007/5861
Abstract: 1-Acyl-2-azabuta-1,3-dienes underwent rearrangement to 4-pyrrolin-2-ones in the presence of acidic catalysts (silica gel or ZnCl 2 ) and water. The reaction proceeded via the formation of 2,3-dihydroxy-3,4-dihydropyrrole and 2-hydroxy-2 Н -pyrrole intermediates, the latter of… read more here.
Keywords: acyl azabuta; pyrrolin ones; acid catalyzed; azabuta dienes ... See more keywords
One-Pot Synthesis of N-(Phosphorylmethyl)Pyrrolidines via Acid-Catalyzed Cascade Elimination/Cyclization/Friedel–Crafts Reaction
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DOI: 10.1007/s10593-020-02697-2
Abstract: The efficient approach to novel water-soluble 2-aryl-substituted N-(phosphorylmethyl)pyrrolidines via acid-catalyzed elimination/cyclization/Friedel–Crafts reaction sequence of {[(4,4-diethoxybutyl)amino]methyl}phosphonates is proposed. Zwitterionic structure of N-(phosphorylmethyl) pyrrolidines has been proved by X-ray crystallography. read more here.
Keywords: phosphorylmethyl pyrrolidines; elimination cyclization; cyclization friedel; pyrrolidines via ... See more keywords
A green non-acid-catalyzed process for direct N=N–C group formation: comprehensive study, modeling, and optimization
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DOI: 10.1007/s11030-017-9808-x
Abstract: The aim of this work is to introduce, model, and optimize a new non-acid-catalyzed system for a direct N$$=$$=N–C bond formation. By reacting naphthols or phenol with anilines in the presence of the sodium nitrite… read more here.
Keywords: modeling optimization; direct group; formation; acid catalyzed ... See more keywords
Acid-catalyzed isomerization of caryophyllene in the presence of SiO2 and Al2O3 impregnated with sulfuric acid
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DOI: 10.1007/s11172-018-2179-3
Abstract: The conversion of caryophyllene upon contact with Al2O3 and SiO2 impregnated with sulfuric acid was carried out, and the components of the resulting mixtures were identified. Having in hands such “standard” mixtures greatly facilitates identification… read more here.
Keywords: caryophyllene; impregnated sulfuric; sulfuric acid; sio2 ... See more keywords
Monoradically luminescent polymers by a super acid-catalyzed polymerization and deep-red electroluminescence
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DOI: 10.1007/s11426-020-9778-9
Abstract: Luminescent radicals have received great attention recently due to their idiographic luminescent properties and potential 100% utilization efficiency of doublets under electrical excitation. However, luminescent radical polymers are rarely explored owing to their challenging molecular… read more here.
Keywords: super acid; electroluminescence; acid catalyzed; catalyzed polymerization ... See more keywords
Antireflective coating based on TiO2 nanoparticles modified with coupling agents via acid-catalyzed sol-gel method
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DOI: 10.1016/j.apsusc.2019.02.256
Abstract: Abstract TiO2 – based materials were synthesized via acid-catalyzed sol-gel method using tetraethoxysilane (TEOS) and/or methyltriethoxysilane (MTES) - as silane coupling agents. The physical and chemical properties of the obtained TiO2 – based materials were… read more here.
Keywords: sol gel; gel method; catalyzed sol; coupling agents ... See more keywords
Levulinic acid production by two-step acid-catalyzed treatment of Quercus mongolica using dilute sulfuric acid.
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DOI: 10.1016/j.biortech.2016.11.063
Abstract: The objectives of this research were to produce a levulinic acid by two-step acid-catalyzed treatment of Quercus mongolica and to investigate the effect of treatment parameter (reaction temperature range: 100-230°C; sulfuric acid (SA) concentration range:… read more here.
Keywords: treatment; step; catalyzed treatment; step acid ... See more keywords
Structural differences of the soluble oligomers and insoluble polymers from acid-catalyzed conversion of sugars with varied structures.
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DOI: 10.1016/j.carbpol.2019.04.012
Abstract: In this paper, acid-catalyzed conversion of nine sugars (xylose, glucose, fructose, galactose, sucrose, maltose, lactose, raffinose, and β-cyclodextrin) with different sizes, steric structures and functionalities were investigated and impacts of the varied sugars on structures… read more here.
Keywords: insoluble polymers; oligomers insoluble; catalyzed conversion; carbon materials ... See more keywords