3,4-Dihydropyrimidin-2(1H)-ones were synthesised in high yields by one-pot three-component Biginelli condensation in the presence of room temperature ionic liquids such as 1-n-butyl-3-methylimidazolium tetrafluoroborate (BMImBF4) or hexafluorophosphorate (BMImPF6) as catalysts under solvent-free and neutral conditions.

★★★★☆ Jiajian Peng and Youquan Deng. Tetrahedron Letters 42 (2001) 5917–5919.

At 170 degreesC and ca. 4.0 MPa, oxidative carbonylation of aromatic amines to synthesize corresponding carbamates over a novel PdCl2/ZrO2-SO42- catalyst could proceed with high conversion and selectivity.

★★★☆☆ Feng Shi, Youquan Deng,1 Tianlong SiMa, and Hongzhou Yang. Journal of Catalysis 203, 525–528 (2001).

A novel synthesis of several dialkylureas by electrocatalytical carbonylation of aliphatic amines was investigated at 30 degreesC and atmospheric pressure in the presence of Pd(II) and Cu(II) cocatalyst., This catalyst system was very effective for the carbonylation of primary mono-amines. Furthermore, the phenomenon of the non-Faradic electrochemical modification of catalytic activity was observed in this homogeneous reaction system and the current efficiency for dialkylurea formation reached 401%.

★★★☆☆ Keywords: Carbon monoxide; Electrocatalysis; Aliphatic amines; Carbonylation; Dialkylurea

★★★☆☆ H. Yang et al. / Journal of Molecular Catalysis A: Chemical 176 (2001) 73–78.

At 200 degreesC and 5 MPa of initial total pressure, the oxidative carbonylation of amines for the synthesis of the corresponding carbamates by Au(i) complexes as catalysts was conducted with excellent conversion and selectivity.

★★★★☆ Shi, F; Deng, YQ. Chem. Commun., 2001, 443–444.

Organic Au(I) complexes could be highly effective catalysts for the synthesis of diformamides by carbonylation of aliphatic diamines, with selectivity significantly enhanced in the presence of the appropriate amount of oxygen.

★★★★☆ Feng Shi, Youquan Deng, Hongzhou Yang and Tianlong SiMa. Chem. Commun., 2001, 345–346.

Directly catalytic oxidation of cyclohexene to adipic acid with hydrogen peroxide over environmentally benign peroxytungstate-organic complex catalysts is performed with excellent yields and selectivities, without any organic solvent and harmful phase-transer catalyst.

★★★★☆ Deng, YQ; Ma, ZF; Wang, K, et al. GREEN CHEMISTRY, 1999, 1, 275-276.