40424-21-3Relevant articles and documents
1H and 13C NMR study on some substituted azolidine derivatives
Cerioni, Giovanni,Cristiani, Franco,Devillanova, Francesco A.,Diaz, Angelo,Verani, Gaetano
, p. 929 - 932 (1983)
The 1H and 13C NMR spectra carried out on (where for R = H, X = NH, NMe, NEt, CH2, S, O; for R = Me, X = NMe, CH2; for R = Et, X = NEt) are reported.The comparison of these results with those obtained for the thionic and selonic isologues shows that sulphur and selenium have a greater deshielding effect on the ring than oxygen.The resonance of the carbons not involved in the ? system have been correlated with the ? charges calculated by the DEL RE method.
Efficient solvent-free synthesis of urea derivatives using selenium-catalyzed carbonylation of amines with carbon monoxide and oxygen
Mizuno, Takumi,Nakai, Takeo,Mihara, Masatoshi
experimental part, p. 4251 - 4255 (2011/03/17)
In the presence of a catalytic amount of selenium under ambient pressure of carbon monoxide with oxygen, solvent-free facile synthesis of urea derivatives was developed; the aim is for green and sustainable chemistry. For example, N,N-dimethylethylenediamine (20 mmol) successfully afforded 1,3- dimethylimidazolidin-2-one (DMI) in 74% yield (1487% based on Se) using selenium catalyst (5 mol%) under mixed gas (CO/O2, 2:1) at 0.1 MPa, 20 C without any additive or solvent
Intermolecular hydroamination of ethylene and 1-alkenes with cyclic ureas catalyzed by achiral and chiral gold(I) complexes
Zhang, Zhibin,Lee, Seong Du,Widenhoefer, Ross A.
supporting information; experimental part, p. 5372 - 5373 (2009/09/25)
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