FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W4311886817> ?p ?o ?g. }

• W4311886817 endingPage "137599" @default.
• W4311886817 startingPage "137599" @default.
• W4311886817 abstract "An O-alkylation reaction catalyzed by tetrabutylammonium hydroxide (TBAH) as a phase-transfer agent was applied to a humic acid (HA) to modify its hydrophobic properties. The carboxyl and hydroxyl functional groups of HA acted as nucleophiles in substitution reactions (Sn2) with methyl iodide, pentyl bromide and benzyl bromide added in amounts equimolar to 20, 60 and 80% of HA total nucleophilic sites. The occurrence of O-alkylation was shown by DRIFT spectrometry, NMR spectroscopy, High Performance Size Exclusion Chromatography (HPSEC) and elemental analysis of reaction products. DRIFT spectra showed changes in C–H stretching and bending regions following the insertion of methyl and pentyl groups, while the incorporation of benzyl groups revealed the characteristics aromatic C–H stretching bands. Both liquid- and solid-state NMR spectra revealed characteristic signals for alkyl/aryl esters and ethers. HPSEC chromatograms of alkylated materials invariably displayed an increase in hydrodynamic volume in respect to the original HA, thereby suggesting that the enhanced hydrophobicity conveyed further associations among humic molecules. Analytical, HPSEC and spectroscopic results suggest that benzylation was the most effective reaction at all percentages of HA total nucleophilicity, followed, in the order, by pentylation and methylation, The benzylation reaction was used to improve reaction and work-up conditions and show that HA could be efficiently alkylated also with substantial reduction of TBAH amount, with no THF addition, increase of reaction time and of washing cycles to remove catalyst impurities. These findings indicate that the hydrophobicity of humic substances can be modulated through a mild O-alkylation reaction under a phase-transfer catalysis according to the extent of exposed HA nucleophilic sites. Such a structural modification of humic matter may have multiple chemical, environmental and biological applications." @default.
• W4311886817 created "2023-01-02" @default.
• W4311886817 creator A5001520340 @default.
• W4311886817 creator A5006429878 @default.
• W4311886817 creator A5066790773 @default.
• W4311886817 creator A5070646124 @default.
• W4311886817 creator A5089591293 @default.
• W4311886817 creator A5090384824 @default.
• W4311886817 date "2023-02-01" @default.
• W4311886817 modified "2023-09-25" @default.
• W4311886817 title "Varying the hydrophobicity of humic matter by a phase-transfer-catalyzed O-alkylation reaction" @default.
• W4311886817 cites W1566631867 @default.
• W4311886817 cites W1967677705 @default.
• W4311886817 cites W1974942775 @default.
• W4311886817 cites W1996460806 @default.
• W4311886817 cites W2006335382 @default.
• W4311886817 cites W2019622998 @default.
• W4311886817 cites W2047220626 @default.
• W4311886817 cites W2051689940 @default.
• W4311886817 cites W2072430487 @default.
• W4311886817 cites W2085198861 @default.
• W4311886817 cites W2088202199 @default.
• W4311886817 cites W2133604858 @default.
• W4311886817 cites W2142903202 @default.
• W4311886817 cites W2149283213 @default.
• W4311886817 cites W2171937009 @default.
• W4311886817 cites W2238876611 @default.
• W4311886817 cites W2321548141 @default.
• W4311886817 cites W2588569060 @default.
• W4311886817 cites W2752459242 @default.
• W4311886817 cites W2775714556 @default.
• W4311886817 cites W2968405439 @default.
• W4311886817 cites W3011969080 @default.
• W4311886817 cites W3014201136 @default.
• W4311886817 cites W3016226974 @default.
• W4311886817 cites W3110177713 @default.
• W4311886817 cites W3120720107 @default.
• W4311886817 cites W3125601372 @default.
• W4311886817 cites W3154280499 @default.
• W4311886817 cites W3163462172 @default.
• W4311886817 cites W3206610719 @default.
• W4311886817 cites W4200162106 @default.
• W4311886817 cites W4210648308 @default.
• W4311886817 cites W4214678363 @default.
• W4311886817 cites W4288080953 @default.
• W4311886817 doi "https://doi.org/10.1016/j.chemosphere.2022.137599" @default.
• W4311886817 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36549509" @default.
• W4311886817 hasPublicationYear "2023" @default.
• W4311886817 type Work @default.
• W4311886817 citedByCount "0" @default.
• W4311886817 crossrefType "journal-article" @default.
• W4311886817 hasAuthorship W4311886817A5001520340 @default.
• W4311886817 hasAuthorship W4311886817A5006429878 @default.
• W4311886817 hasAuthorship W4311886817A5066790773 @default.
• W4311886817 hasAuthorship W4311886817A5070646124 @default.
• W4311886817 hasAuthorship W4311886817A5089591293 @default.
• W4311886817 hasAuthorship W4311886817A5090384824 @default.
• W4311886817 hasConcept C121332964 @default.
• W4311886817 hasConcept C1276947 @default.
• W4311886817 hasConcept C135731615 @default.
• W4311886817 hasConcept C155647269 @default.
• W4311886817 hasConcept C161790260 @default.
• W4311886817 hasConcept C164361826 @default.
• W4311886817 hasConcept C178790620 @default.
• W4311886817 hasConcept C178907741 @default.
• W4311886817 hasConcept C181199279 @default.
• W4311886817 hasConcept C185592680 @default.
• W4311886817 hasConcept C193363816 @default.
• W4311886817 hasConcept C2776300020 @default.
• W4311886817 hasConcept C2778870691 @default.
• W4311886817 hasConcept C2778874371 @default.
• W4311886817 hasConcept C2778930939 @default.
• W4311886817 hasConcept C2780073701 @default.
• W4311886817 hasConcept C2780239050 @default.
• W4311886817 hasConcept C2780263894 @default.
• W4311886817 hasConcept C2781076698 @default.
• W4311886817 hasConcept C4839761 @default.
• W4311886817 hasConcept C66974803 @default.
• W4311886817 hasConcept C67787023 @default.
• W4311886817 hasConcept C96765332 @default.
• W4311886817 hasConceptScore W4311886817C121332964 @default.
• W4311886817 hasConceptScore W4311886817C1276947 @default.
• W4311886817 hasConceptScore W4311886817C135731615 @default.
• W4311886817 hasConceptScore W4311886817C155647269 @default.
• W4311886817 hasConceptScore W4311886817C161790260 @default.
• W4311886817 hasConceptScore W4311886817C164361826 @default.
• W4311886817 hasConceptScore W4311886817C178790620 @default.
• W4311886817 hasConceptScore W4311886817C178907741 @default.
• W4311886817 hasConceptScore W4311886817C181199279 @default.
• W4311886817 hasConceptScore W4311886817C185592680 @default.
• W4311886817 hasConceptScore W4311886817C193363816 @default.
• W4311886817 hasConceptScore W4311886817C2776300020 @default.
• W4311886817 hasConceptScore W4311886817C2778870691 @default.
• W4311886817 hasConceptScore W4311886817C2778874371 @default.
• W4311886817 hasConceptScore W4311886817C2778930939 @default.
• W4311886817 hasConceptScore W4311886817C2780073701 @default.
• W4311886817 hasConceptScore W4311886817C2780239050 @default.
• W4311886817 hasConceptScore W4311886817C2780263894 @default.

• next