The formation of complexes between aza-derivatives of crown ethers and primary alkylammonium salts. Part 5. Chiral macrocyclic diamines
作者:David P. J. Pearson、Stephen J. Leigh、Ian O. Sutherland
DOI:10.1039/p19790003113
日期:——
analogous to crownethers, are described. The chirality of these systems is based, in one case, upon the plane of chirality of paracyclophane systems and, in the other two cases, upon the axis of chirality of bridged biphenyls. Two methods are described for the measurement of chiral selectivity in the formation of complexesbetween these chiral macrocyclic host molecules and chiral guest primary alkylammonium
LEIGH S. J.; SUTHERLAND I. O., J. CHEM. SOC. PERKIN TRANS., PART 1, NO 4, 1089-1103
作者:LEIGH S. J.、 SUTHERLAND I. O.
DOI:——
日期:——
JOHNSON, M. R.;JONES, N. F.;SUTHERLAND, I. O.;NEWTON, R. F., J. CHEM. SOC. PERKIN TRANS., 1985, N 8, 1637-1643
作者:JOHNSON, M. R.、JONES, N. F.、SUTHERLAND, I. O.、NEWTON, R. F.
DOI:——
日期:——
Cyclopropenimine‐Mediated CO2 Activation for the Synthesis of Polyurethanes and Small‐Molecule Carbonates and Carbamates
作者:Dino Wu、Robert T. Martin、Jeanette Piña、Junho Kwon、Michael P. Crockett、Andy A. Thomas、Osvaldo Gutierrez、Nathaniel H. Park、James L. Hedrick、Luis M. Campos
DOI:10.1002/anie.202401281
日期:2024.4.24
Carbon dioxide (CO2) is an abundant C1 feedstock with tremendous potential to produce versatile building blocks in synthetic applications. Given the adverse impact of CO2 on the atmosphere, it is of paramount importance to devise strategies for upcycling it into useful materials, such as polymers and fine chemicals. To activate such stable molecule, superbases offer viable modes of binding to CO2. In this study, a superbase cyclopropenimine derivative was found to exhibit exceptional proficiency in activating CO2 and mediating its polymerization at ambient temperature and pressure for the synthesis of polyurethanes. The versatility of this reaction can be extended to monofunctional amines and alcohols, yielding a variety of functional carbonates and carbamates.