13402-31-8Relevant academic research and scientific papers
Synthesis of mono-, di-, and triaminobismuthanes and observation of C-C coupling of aromatic systems with bismuth(iii) chloride
Hering-Junghans, Christian,Schulz, Axel,Thomas, Max,Villinger, Alexander
supporting information, p. 6053 - 6059 (2016/04/26)
The reaction of lithium N-trimethylsilyl-amides of the type RN(SiMe3)Li with bismuth(iii) chloride yielded mono-, di- or triaminobismuthanes depending on the sterical demand of the anilide ligand R and the used stoichiometry. For the bulky Mes? substituent the reaction with BiCl3 resulted in the formation of a C-C coupling product as the main product besides a small amount of the expected Mes?N(SiMe3)BiCl2.
One-Pot C?H Functionalization of Arenes by Diaryliodonium Salts
Reitti, Marcus,Villo, Piret,Olofsson, Berit
supporting information, p. 8928 - 8932 (2016/07/26)
A transition-metal-free, mild, and highly regioselective synthesis of nitroarenes from arenes has been developed. The products are obtained in a sequential one-pot reaction by nitration of iodine(III) reagents with two carbon ligands, which are formed in situ from iodine(I). This novel concept has been extended to formation of aryl azides, and constitutes an important step towards catalytic reactions with these hypervalent iodine reagents. An efficient nitration of isolated diaryliodonium salts has also been developed, and the mechanism is proposed to proceed by a [2,2] ligand coupling pathway.
Fe(II) and Co(II) pyridinebisimine complexes bearing different substituents on ortho- and para-position of imines: Synthesis, characterization and behavior of ethylene polymerization
Liu, Jing-Yu,Zheng, Yi,Li, Yan-Guo,Pan, Li,Li, Yue-Sheng,Hu, Ning-Hai
, p. 1233 - 1239 (2007/10/03)
A series of 2,6-bis(imino)pyridyl iron(II) and cobalt(II) complexes [2,6-(ArNCMe)2C5H3N]MCl2 (Ar = 2,6-i-Pr2C6H3, M = Fe: 3a, M = Co: 4a; Ar = 2,4,6-i-Pr3C6H2, M = Fe: 3b, M = Co: 4b; Ar = 2,6-i-Pr2-4-BrC6H2, M = Fe: 3c, M = Co: 4c; Ar = 2,4-i-Pr2-6-BrC6H2, M = Fe: 3d, M = Co: 4d) has been synthesized, characterized, and investigated as precatalysts for the polymerization of ethylene in the presence of modified methylaluminoxane (MMAO). The substituents of pyridinebisimine ligands and their positions located significantly influence catalyst activity and polymer property. It is found that the catalytic activities of the iron complexes/MMAO systems are mainly dominated by electronical effect, while those of the cobalt complexes/MMAO systems are primarily controlled by hindering effect.
Kinetics and Thermodynamics of Ion Pair Dissociation to Yield Free Solvated Ions. Effect of Steric Hindrance
Kokosinski, Jeanette D.,Forch, Brad E.,Stevenson, Gerald R.,Echegoyen, Luis,Castillo, Carlos A.
, p. 793 - 798 (2007/10/02)
The kinetics and thermodynamics of ion pair dissociation involving the anion radicals of ninhydrin, nitrobenzene, and trialkyl-substituted nitrobenzenes ion associated with Na+, K+, Cs+, or (Bu)4N+ in hexamethylphosphoramide (HMPA) were studied via ESR spectroscopy.The large alkyl groups on the (Bu)4N+ cation were found to sterically inhibit the close approach of the positive nitrogen to the anion radical.However, this loose ion pair dissociates less exothermically and exoenergetically than tighter ion pairs involving the other cations due to the poorer solvation of this large cation by the HMPA.The alkyl groups in the ortho positions of the nitrobenzene anion radical also prevent close approach of a solvated cation to yield intimate ion pairs.These loose ion pairs have lower free energies of activation for ion pair disociation.The observed rates and thermodynamics of ion pair dissociation and formation are explained in terms of ion solvation and steric inhibition to ion association.
