97-51-8Relevant articles and documents
Synthesis, characterization, and photochromism study of two spiropyran molecules with a terminal alkynyl functional group and their new 1,2,3-triazoline-containing derivatives
Mahdavian, Ali Reza,Nasr-Isfahani, Hossein,Notash, Behrouz,Sepehr, Zeinalabedin
, (2021/10/19)
The spiropyran derivatives are known for their good photochromic properties. These photochromic compounds are isomerized between two forms; merocyanine is the open-ring form and spiropyran is the closed-ring form. In this work, two spiropyran derivatives (compounds 1 and 2) with the N-alkynyl functional group are prepared. The click reactions of these spiropyran derivatives with 1-azido-4-nitrobenzene and (azidomethyl)benzene are studied. For this purpose, 3,3-dimethyl-2-methylene-1-prop-2-ynyl-2,3-dihydro-1H-indole is synthesized, which is then reacted with 3- and 5-nitrosalicylaldehyde. The FT-IR, 1H-NMR, and 13C-NMR spectra of the reaction products are used for their characterization. The solutions of the products in methanol are prepared, and their UV–visible spectra are investigated. The darkening of the crystals of compound 1 upon exposure to the UV irradiation indicates that the spiro C–O bond in this compound is weaker than that in compound 2, which is due to the presence of the nitro group in the para position relative to this bond, and consequently, the stabilization of the open-ring form.
Catalytic oxidation of alcohols and alkyl benzenes to carbonyls using Fe3O4?SiO2?(TEMPO)-: Co -(Chlorophyll-CoIII) as a bi-functional, self-co-oxidant nanocatalyst
Hamah-Ameen, Baram Ahmed,Kazemnejadi, Milad,Mahmoudi, Boshra,Rostami, Amin
, p. 6600 - 6613 (2020/11/16)
Chlorophyll b was extracted from heliotropium europaeum plant, demetalated, allylated and grafted to acrylated TEMPO through a copolymerization protocol. Then, the chlorophyll monomers were coordinated to Co ions, immobilized on magnetic nanoparticles and the resulting hybrid was used as a powerful catalyst for a variety of oxidation reactions. By using the present method, oxidation of benzylic alcohols and alkyl benzenes to carbonyls was accomplished in water under aerobic conditions. Moreover, direct oxidation of alcohols to carboxylic acids was performed by adding NaOCl to the mixture. All entries were oxidized to the corresponding desired product with high to excellent yields and up to 97% selectivity. The catalyst was thoroughly characterized by CV, TGA, VSM, XRD, XPS, DLS, FE-SEM, TEM, UV-Vis, EDX, and BET analyses. The activity of the catalyst was investigated by applying various components of the catalyst to the oxidation model separately. The reasonable mechanisms are suggested based on the cooperation between the TEMPO groups and cobalt(iii) (or Co(iv)) sites on the catalyst. The catalyst could be recovered and reused for at least 7 consecutive recycles without any considerable reactivity loss. This journal is
Method for synthesizing 5-nitrosalicylaldehyde
-
Paragraph 0020; 0023-0039, (2020/10/04)
The invention discloses a method for synthesizing 5-nitrosalicylaldehyde. 5-nitrosalicylaldehyde is prepared by taking p-nitrophenol as a raw material and trifluoroacetic acid as a catalyst through animproved Duff reaction and hexamethylenetetramine reaction. Compared with a salicylaldehyde nitration method, the synthesis method provided by the invention effectively inhibits the generation of isomers in the synthesis process of 5-nitrosalicylaldehyde, and is convenient for separation and purification of a target product; the use of reaction raw materials with high toxicity and serious environmental pollution and high-temperature and high-pressure reaction conditions are avoided, the reaction conditions are mild, the post-treatment process is simple, the synthesis reaction efficiency is improved, and the yield of the 5-nitrosalicylaldehyde reaches 63% or above.
