71067-10-2Relevant academic research and scientific papers
Novel homo-and Co-polymers based on 7-Methacryloyloxy-4-methylcoumarin: Synthesis, antimicrobial activity, pour-point depressants and their effects on the rheology of the waxy crude oil
Hefny, Ahmed M.K.,Ashmawy, Ashraf M.,Elazabawy, Samia R.,Abdallah, Amira E.M.,El Elnaggar, Sayed M.
, p. 1941 - 1955 (2021/04/22)
This study aimed to synthesize new polymeric additives including homo- and co-polymers based on 4-methyl-2-oxo-2H-chromen-7-yl methacrylate monomer and evaluating their activity as potential antimicrobials and as pour-point depressants for modification of waxy crude oil rheology. The resultant compounds were characterized by their IR, 1H NMR and 13C NMR spectral data. The formation of the new polymers, namely, poly(7-methacryloyloxy-4-methylcoumarin) [poly(MAOMC)] homo-polymer, poly(7-methacryloyloxy-4-methylcoumarin-co-vinylacetate) [poly(MAOMC)-co-(VA)] and poly(7methacryloyloxy-4-methylcoumarin-co- octadecyl 4-(methacryloyloxy)benzoate) [poly(MAOMC)-co-(OMAOB)] copolymers was based on free radical polymerization. The polymerization reaction was carried at 70±2°C using 2,2'-azobisisobutyronitrile (AIBN) as an initiator and dimethylformamide (DMF)/toluene as a solvent in the case of homo-polymer [poly(MAOMC)] and co-polymer [poly(MAOMC)-co-(VA)], while polymerization proceeds at the same temperature by using benzoyl peroxide as an initiator and toluene as a solvent in the case of co-polymer [poly(MAOMC)-co-(OMAOB)] The activities of the resultant compounds as potential antibacterial agents were evaluated against the two Gram-positive (Bacillus cereus and Staphylococcus aureus), the four Gram-negative (Escherichia coli, Neisseria gonorrhoeae, Pseudomonas aeruginosa, and Salmonella typhimrium) bacterial strains, and as antifungal agents against two fungal species (Aspergillus flavus and Candids albicans). The results showed that MAOMC monomer and poly(MAOMC)-co-(OMAOB) copolymer indicated moderate potent activity towards the bacterial and fungal strains used. At the other extreme, the influence of coumarin and octadecyl benzoate based compounds on the pour-point depression and on the rheological properties of crude oil with low asphaltene content was studied. The results indicated that all three polymers exhibited very good efficiency as additives to improve the flow-ability of the tested crude oil. Moreover, the poly(MAOMC)-co-(OMAOB) co-polymer was found to exhibit the highest performance to reduce and depress the pour-point of the tested crude oil and decrease the viscosity to a large extent due to the presence of two aromatic units with the long aliphatic carbon chain in its structure.
Proline ionic liquid and method for catalyzing synthesis of paraben by proline ionic liquid
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Paragraph 0067-0070, (2020/09/16)
The invention discloses proline ionic liquid and a method for catalyzing synthesis of paraben by the proline ionic liquid. The preparation method comprises the following steps: adding N-butylbenzimidazole, a solvent and proline into a dry three-neck flask, carrying out reflux reaction until the reaction is complete (monitored by TLC), evaporating to remove the solvent to obtain a faint yellow oilyliquid, namely the proline ionic liquid, adding p-hydroxybenzoic acid, alcohol and a proline ionic liquid into a dry three-necked bottle, heating to reflux reaction, monitoring by TLC until the reaction is finished, evaporating under reduced pressure to remove the solvent, extracting residues with diethyl ether, evaporating the diethyl ether phase to remove the solvent to obtain the methylparabenwith the yield of 88% or above, wherein the remainder is the ionic liquid, and carrying out washing and drying so that the product can be recycled for many times. The method disclosed by the invention is efficient, environment-friendly and safe, the catalyst can be recycled, the cost is reduced, the requirement on equipment is low, and the method is an efficient method for synthesizing paraben.
"Structured Nuclei" of 4-(Octadecyloxy)benzoic Acid Monolayer for Induced Nucleation of 4-Hydroxybenzoic Acid Monohydrate As Determined by Grazing Incidence X-ray Diffraction on the Aqueous Solution
Weissbuch, Isabelle,Berkovic, Garry,Yam, Ruth,Als-Nielsen, Jens,Kjaer, Kristian,et al.
, p. 6036 - 6045 (2007/10/02)
A monolayer of 4-(octadecyloxy)benzoic acid at the air-solution interface has been used to induce oriented nucleation of three-dimensional (3-D) crystals of 4-hydroxybenzoic acid (HBA) minohydrate.The two-dimensional (2-D) crystalline structure of this mo
