2243-47-2Relevant articles and documents
Pd-catalyzed reductive cleavage of alkyl aryl sulfides with triethylsilane that is accelerated by trialkylsilyl chloride
Matsumura, Takehiko,Niwa, Takashi,Nakada, Masahisa
experimental part, p. 4313 - 4316 (2012/09/22)
The palladium-catalyzed reductive cleavage of alkyl aryl sulfides to afford the corresponding arenes in high yield, which is both accelerated and exhibits increased functional group selectivity in the presence of TMSCl, is described. This ligand-free reaction features mild conditions, easy operation, use of readily available reagents, and high functional group selectivity.
Electrospray ionization mass spectrometry detection of intermediates in the palladium-catalyzed oxidative self-coupling of areneboronic acids
Aramendia,Lafont,Moreno-Manas,Pleixats,Roglans
, p. 3592 - 3594 (2007/10/03)
Several intermediates of the oxidative coupling of areneboronic acids to afford biaryls have been identified by electrospray ionization mass spectrometry. Knowledge has been gained about the steps occurring after the biaryl formation and leading to the recovery of the catalytic species.
Desulfurization of Benzo- and Dibenzothiophenes with Nickel Boride
Back, Thomas G.,Yang, Kexin,Krouse, H. Roy
, p. 1986 - 1990 (2007/10/02)
Nickel boride, prepared from the reduction of nickel chloride hexahydrate with sodium borohydride in methanol-tetrahydrofuran, reduces benzothiophenes to alkylbenzenes and dibenzothiophenes to biphenyls.The reaction is rapid at or below room temperature and does not require protection from the atmosphere.Best results are obtained when the nickel boride is generated in situ in the presence of the sulfur compound.Hydroxyl, carboxyl, ester, and amino groups are unaffected while chloro, bromo, and nitro substituents are also reduced under these conditions.A short-livedintermediate, possibly a nickel hydride species, appears to be required in the desulfurization.Complexation of the substrate to the nickel boride surface, followed by stepwise reduction of the two C-S bonds, occurs.The faster disappearance of dibenzothiophene containing the lighter 32S isotope compared to that with 34S (k(32S)/k(34S) = 1.005 to 1.006) suggests that C-S bond cleavage is the rate-determining step.
Bis(salicylaldehyde)ethylenedi-iminecobalt(II)-catalysed Oxidation of Aromatic Amins with Oxygen
Benedini, Francesca,Galliani, Guido,Nali, Micaela,Rindone, Bruno,Tollari, Stefano
, p. 1963 - 1968 (2007/10/02)
N-n-Butylanilines undergo N-dealkylation to give a primary amine and butyrylaldehyde by oxidation with oxygen in the presence of bis(salicylaldehyde)ethylenedi-iminecobalt(II) (CoIIsalen) as a catalyst.High conversions are obtained with high catalyst concentrations and low / ratios (r).Inspection of the effect of catalyst and substrate concentrations on initial reaction rates (Vin) shows poor sensitivity to the electronic effect of the nuclear substituent.Some anilines give azo derivatives at a lower rate in the same conditions.
