14973-90-1Relevant articles and documents
Rhodium-catalyzed reductive carbonylation of aryl iodides to arylaldehydes with syngas
Chen, Suqing,Liu, Zhenghui,Mu, Tiancheng,Wang, Peng,Yan, Zhenzhong,Yu, Dongkun,Zhao, Xinhui
, p. 645 - 656 (2020)
The reductive carbonylation of aryl iodides to aryl aldehydes possesses broad application prospects. We present an efficient and facile Rh-based catalytic system composed of the commercially available Rh salt RhCl3·3H2O, PPh3 as phosphine ligand, and Et3N as the base, for the synthesis of arylaldehydes via the reductive carbonylation of aryl iodides with CO and H2 under relatively mild conditions with a broad substrate range affording the products in good to excellent yields. Systematic investigations were carried out to study the experimental parameters. We explored the optimal ratio of Rh salt and PPh3 ligand, substrate scope, carbonyl source and hydrogen source, and the reaction mechanism. Particularly, a scaled-up experiment indicated that the catalytic method could find valuable applications in industrial productions. The low gas pressure, cheap ligand and low metal dosage could significantly improve the practicability in both chemical researches and industrial applications.
THE PREPARATION OF cis- AND trans- (Ar = ARYL) AND THEIR READY DISSOCIATION IN SOLUTION
Hartley, F.R.,Murray, S.G.,Potter, D.M.
, p. 119 - 126 (2007/10/02)
Attempts to prepare complexes have shown that when X=I these complexes are far less stable than the well-known .The bromo complexes (Ar=C6H5, p-EtC6H4) can be prepared by simple halide exchange from their respective chloro complexes.However a similar attempt to prepare the iodo complexes was frustrated by dissociative equilibria; in the absence of oxygen dimers were formed, whereas in the presence of oxygen polymeric oxygen complexes were formed.The ease of dissociation of phosphine can be attributed to the greater steric crowding in the iodo complexes than in the chloro and bromo complexes.The complex could only be obtained in the presence of excess PPh3, which inhibits the dissociation.The identification of this monomer was further complicated by the previously unnoticed presence of both cis and trans isomers in the solid state.
