26348-47-0Relevant articles and documents
Synthesis of oxazoles from enamides via phenyliodine diacetate-mediated intramolecular oxidative cyclization
Zheng, Yunhui,Li, Xuming,Ren, Chengfeng,Zhang-Negrerie, Daisy,Du, Yunfei,Zhao, Kang
, p. 10353 - 10361 (2013/01/15)
A group of functionalized oxazoles were synthesized in moderate to good yields from enamides via phenyliodine diacetate (PIDA)-mediated intramolecular cyclization. The main advantageous features of the present method include its broad substrate scope and the heavy-metal-free characteristic of the oxidative carbon-oxygen bond formation process.
Kinetics and mechanism of the nucleophilic ring opening of oxazolinone in mixed aqueous solvents
Ismail, Amel M.
, p. 916 - 922 (2008/02/09)
Solvent effect on the kinetics of ring opening of oxazolinone has been investigated in neutral and alkaline medium in dioxan-water mixtures up to 50% v/v in the temperature range of 40-60°C. The thermodynamic activation parameters have been calculated and discussed in terms of solvation effect. The isokinetic temperature in both media (310, 303 and 298 K for neutral, alkaline hydrolysis by NaOH and Na2CO3 respectively) indicates that the reaction is entropy controlled and that solute-solvent interactions play an important role. The correlation of logk2 against either Grunwald-Wientien Y values or log[H2O] Is found to be linear, while the correlation between logk2 and the reciprocal of the dielectric constant is nonlinear. The estimated value of the slope m in Grunwald relationship gives a value less than unity indicating SAN/SN2 mechanism. Mechanism for the oxazolinone ring opening has been proposed.
An usual behaviour of ethers in presence of azlactones under ultrasound irradiation to give esters
Rajaram, S.,Lalitha, N.,Iyengar, D. S.
, p. 761 - 763 (2007/10/03)
The phenomenon of ester formation from ethers and azlactones under sonolysis has been observed.