Activation of coordinated carbon monoxide toward alkyl and aryl migration (carbon monoxide insertion) by molecular Lewis acids and x-ray structure of the reactive intermediate

Syntheses and structures of molybdenum and tungsten pentabenzylcyclopentadienyl complexes: new chlorination reactions

“…The distances between the molybdenum and the five carbons of the Cp ring may be separated in two ranges. Shorter bond lengths are formed between the metal and carbons C(1) and C(5) (2.324(10) and 2.323 (11) A) that are closer to the acyl ligand. The other Mo-C distances 3 , PEt 3 , R ¼ Me) [13].…”

Synthesis, characterization and coordination chemistry of a new phosphite–ether ligand: The effects of alkali metal salts and the ligand/Rh molar ratio on the catalytic activity and regioselectivity of a Rh(I) complex of this ligand in the hydroformylation of styrene

“…Such binding is known to activate carbonyl ligands towards nucleophilic attack and to weaken the metal-carbonyl bond [9][10][11][12][13][14], which would facilitate migratory-insertion reactions [50,51] in the catalytic cycle and could also affect the equilibria between five-coordinate reservoir species and four-coordinate active intermediates for the alkene coordination and H 2 oxidative-addition steps in the catalytic cycle. The results from this study with catalysts having L/ Rh = 2.5 are consistent with this hypothesis.…”

Síntese e emprego do ciclometalado [Pd(dmba)(N3)(PPh3)] em processos catalíticos envolvendo a n-carbonilação redutiva de nitroarenos a carbamatos e na síntese de derivados da uréia

“…O cloreto de estanho(IV) é um co-catalisador efetivo para complexos de platina em reações de hidroformilação 15 . Estudos anteriores indicaram que este ácido de Lewis promove inserção migratória de monóxido de carbono na ligação metal-carbono 16 ou na ligação metal-nitrogênio gerando, neste caso, o complexo aril isocianato 14 . Temperaturas reacionais típicas situam-se na faixa entre 120 e 200°C , enquanto as pressões normalmente ficam entre 40 e 100 bar 2 .…”