7377-03-9Relevant articles and documents
Influence of octanohydroxamic acid on the association behavior of cationic surfactants: Hydrolytic cleavage of phosphate ester
Satnami, Manmohan L.,Dewangan, Hitesh K.,Kandpal, Neha,Nagwanshi, Rekha,Ghosh, Kallol K.
, p. 805 - 814 (2016)
The surface properties and mixed micellization behavior of cetyltrimethylammonium bromide (CTAB), tetradecyltrimethylammonium bromide (TTAB) and dodecyltrimethylammonium bromide (DTAB) with octanohydroxamic acid (OHA) have been investigated by means of conductivity and surface tension measurements in aqueous solution and borate buffer at 300 K. The critical micelle concentration (cmc), surface properties such as maximum surface access (Γmax), surface pressure at the cmc (Πcmc) and minimum surface area per molecule (Amin) has been determined. The standard Gibbs free energy of micellization (ΔGm0), standard Gibbs free energy of adsorption (ΔGad0), and standard Gibbs free energy of micellization per alkyl chain (ΔGm,tail0) of cationic surfactant with OHA have been evaluated. The fluorescence quenching technique was used to estimate the aggregation number (Nagg) and packing parameter (P) for determining the structural feature of cationic surfactants in the presence of octanohydroxamic acid. The hydrolytic reaction of paraoxon with octanohydroxamic acid was studied under a cationic micellar system by using OHA- at 9.2 pH and 300 K. The variations of surface properties from aqueous medium to the reaction condition have also been discussed. Pseudophase model (PPM) has been fitted for the quantitative treatment of the data.
Preparation process of capryloyl hydroxamic acid
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Paragraph 0034-0042; 0046-0054, (2021/01/30)
The invention relates to the field of chemical synthesis, and particularly discloses a preparation process of capryloyl hydroxamic acid, which comprises the following steps: preparing ethyl n-caprylate, and preparing the capryloyl hydroxamic acid, wherein the ethyl n-caprylate is prepared by the following steps: mixing 1-1.5 kg of n-caprylic acid with 0.35-0.7 kg of ethanol, adding solid superacid, performing heating reflux for 5-7 hours, filtering to obtain precipitate and filtrate, and performing reduced pressure distillation on the filtrate to obtain the ethyl n-caprylate, and the obtainedprecipitate is washed and roasted to obtain the solid superacid, and the solid superacid is recycled to the preparation step of the ethyl n-caprylate for use. By using the solid superacid catalyst, the environmental friendliness of the esterification reaction in the n-capryloyl hydroxamic acid preparation process is improved.
Thioether-Directed NiH-Catalyzed Remote γ-C(sp3)-H Hydroamidation of Alkenes by 1,4,2-Dioxazol-5-ones
Chen, Qishu,Du, Bingnan,Ouyang, Yuxin,Yu, Wing-Yiu
supporting information, p. 14962 - 14968 (2021/09/29)
A NiH-catalyzed thioether-directed cyclometalation strategy is developed to enable remote methylene C-H bond amidation of unactivated alkenes. Due to the preference for five-membered nickelacycle formation, the chain-walking isomerization initiated by the NiH insertion to an alkene can be terminated at the γ-methylene site remote from the alkene moiety. By employing 2,9-dibutyl-1,10-phenanthroline as the ligand and dioxazolones as the reagent, the amidation occurs at the γ-C(sp3)-H bonds to afford the amide products in up to 90% yield (>40 examples) with remarkable regioselectivity (up to 24:1 rr).