137838-23-4Relevant articles and documents
Reactions of 1,2-imino alcohols with phosphoromonochloridites: Formation of 2-iminoalkyl(phenyl) phosphites
Dimukhametov,Bayandina,Davydova,Al'fonsov
, p. 1097 - 1100 (2004)
1,2-Imino alcohols existing in a tautomeric equilibrium with the corresponding 1,3-oxazolidines react with phosphoromonochloridites in ether in the presence of triethylamine to form 2-iminoalkyl(phenyl) phosphites as the only reaction products.
Transition-metal catalyst free C=N coupling with phenol/phenoxide: A green synthesis of a benzoxazole scaffold by an anodic oxidation reaction
Shih, Yachen,Ke, Chengyi,Pan, Chinghao,Huang, Yungtzung
, p. 7330 - 7336 (2013)
By utilizing an anodic oxidative reaction and consuming 2.2 F mol -1 of electricity, C=N coupling with phenol/phenoxide to obtain the five-membered N,O-heteroatom ring of a benzoxazole has been achieved at room temperature. Transition-metal catalysts, chemical oxidants, strong acids, reactive chemical reagents and refluxing are not required. Studies of the electrode, solvent, electrolyte and additive effects to promote the anodic cyclization are included. From the CV studies, the reaction mechanisms of the anodic cyclization are proposed. The Royal Society of Chemistry 2013.
Improvement in aluminum complexes bearing a Schiff base in ring-opening polymerization of ε-caprolactone: the synergy of the N,S-Schiff base in a five-membered ring aluminum system
Huang, Ting-Wei,Su, Rou-Rong,Lin, Yi-Chen,Lai, Hsin-Yu,Yang, Chien-Yi,Senadi, Gopal Chandru,Lai, Yi-Chun,Chiang, Michael Y.,Chen, Hsuan-Ying
, p. 15565 - 15573 (2018)
A series of five-membered ring aluminum complexes bearing thiol-Schiff base ligands were synthesized, and their application in the ring-opening polymerization of ε-caprolactone (CL) was investigated. The complexes exhibited dramatically higher catalytic a
-
Tandon,J.P. et al.
, p. 1379 - 1389 (1976)
-
Oxidative NHC catalysis for base-free synthesis of benzoxazinones and benzoazoles by thermal activated NHCs precursor ionic liquid catalyst using air as oxidant
Guan, Jiali,Liu, Wei,Liu, Yuchen,Song, Zhibin,Tao, Duan-Jian,Yan, Jieying,Yuan, Jian-Jun,Zhou, Youkang
, (2020/05/25)
A reusable thermal activated NHC precursor ionic liquid catalyst ([BMIm]2[WO4]) has been prepared and developed for the synthesis of nitrogen-containing heterocycles such as benzoxazinones and benzoazoles through imines activation. [BMIm]2[WO4] exhibited the good activity for the base-free condensation and oxidative NHC catalysis tandem under air atmosphere. The catalyst can be recovered and reused for at least five runs in gram scale synthesis without any decrease in catalytic activity. Furthermore, the control experiments demonstrated that the reaction involved formation of aromatic aldimines, NHC-catalyzed oxidative formation of imidoyl azoliums and intramolecular cyclization to generate the product.
Effect of substituents on the UV spectra of supermolecular system: Silver nanoparticles with bi-aryl Schiff bases containing hydroxyl
Cao, Chao-Tun,Cheng, Shimao,Zhang, Jingyuan,Cao, Chenzhong
, (2018/11/25)
Effect of substituents on the ultraviolet (UV) spectra of supermolecular system involving silver nanoparticles (AgNPs) and Schiff bases was investigated. AgNPs and 49 samples of model compounds (MC), bi-aryl Schiff bases containing hydroxyl (XBAY, involving 4-OHArCH?NArY, 2-OHArCH?NArY, XArCH?NAr-4′-OH, and XArCH?NAr-2′-OH), were synthesized. The size of AgNPs was characterized by transmission electron microscopy (TEM), and the UV absorption spectra of AgNPs, XBAYs, and MC-AgNPs mixed solutions were measured, respectively. The results show that (1) the size of AgNPs is larger in MC-AgNPs solutions than that in AgNPs solution due to the distribution of MC molecules on the surface of AgNPs; (2) the UV absorption wavelength of XBAYs changes in the action of AgNPs and their wavelength shift exists limitation between XBAY and MC-AgNPs solutions; and (3) the wavelength shift limit of MC-AgNPs (λWSL) is influenced by the substituents X and Y and the position of hydroxyl OH. The wavenumber ΔνWSL of λWSL can be quantified by employing the excited-state substituent constant σexCC and Hammett constant σ of substituents X and Y. Comparing with the 4-OH, the 4′-OH makes the ΔνWSL a red shift, whereas the 2′-OH, comparing with the 2-OH, makes the ΔνWSL a blue shift.
