Effective Guanidine-Catalyzed Synthesis of Carbonate and Carbamate Derivatives from Propargyl Alcohols in Supercritical Carbon Dioxide
作者:Nicola Della Ca'、Bartolo Gabriele、Giuseppe Ruffolo、Lucia Veltri、Tito Zanetta、Mirco Costa
DOI:10.1002/adsc.201000607
日期:2011.1.10
The reactions of propargyl alcohols with carbondioxide in supercriticalcarbondioxide or in acetonitrile with gaseous carbondioxide in the presence of organic bases as catalysts have been examined. Bicyclic guanidines are effective catalysts for the formation of α‐methylene cyclic carbonates under mild reaction conditions. Oxoalkyl carbonates, oxoalkyl carbamates or α‐methyleneoxazolidinones are
Catalytic formation of carbamates and cyclic carbonates by copper complex of 2,5,19,22-tetraaza[6,6](1,1′)ferrocenophane-1,5-diene X-ray crystal structure of [Cu(1)]PF6
作者:Hak-Soo Kim、Jeong-Won Kim、Soon-Chul Kwon、Sang-Chul Shim、Tae-Jeong Kim
DOI:10.1016/s0022-328x(97)00366-5
日期:——
The reaction of [Cu(MeCN)(4)]PF6 with a ferrocene-containing tetraazamacrocycle 2,5,19,22-tetraaza[6,6](1,1')ferrocenophane-1,5-diene (1) gives the copper(I) complex of the type [Cu(1)]PF6 (2) which crystallizes in the orthorhombic system: P2(1)2(1)2(1) (#19); a = 7.597(2) Angstrom, b = 14.805(5) Angstrom, c = 24.194(4) Angstrom; Z = 4; R = 0.080; R-w = 0.083. The geometry around the central metal is a distorted tetrahedron with two pairs of differing Cu-N bond length. This complex has demonstrated the excellent catalytic activity toward the formation of cyclic carbonates and carbamates in the presence of CO2, giving almost quantitative product yields in most reactions that have been employed. (C) 1997 Elsevier Science S.A.