In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 496-41-3, name is Benzofuran-2-carboxylic acid, introducing its new discovery. Safety of Benzofuran-2-carboxylic acid
Influence of carboxylic acids on the reactions with chlorotetraacetatodiruthenium(II,III): X-ray crystal structure of [Ru2(mu-O2CC4H3S)4(OPPh3)2]BF4*2H2O
The reaction of Ru2Cl(mu-O2CCH3)4 with indole-2-carboxylic, N-methyl-pyrrole-2-carboxylic, furane-2-carboxylic, thiophene-2-carboxylic and benzofurane-2-carboxylic acids, which contain nitrogen, oxygen or sulphur atoms in the alpha position with respect to the carboxylate group, leads to compounds of the type Ru2Cl(mu-O2CR)4. In these compounds O,O-coordination of the carboxylate ligands has been found. The analogous reaction with quinoline-2-carboxylic acid (Hquin) gives a disproportionation process with formation of Ru(quin)3 and Ru2(quin)4; in this case, N,O-coordination of the ligand has been observed. The indole-2-carboxylato derivative has a non-polymeric structure, whereas with the other ligands polymeric structures with chlorine atoms bridging Ru2(5+) units are formed. Treatment of Ru2Cl(mu-O2CR)4 in thf or acetone with AgBF4 gave [Ru2(mu-O2CR)4L2]BF4 (L=thf, acetone; R=N-methyl-2-pyrrolyl, 2-furyl, 2-thienyl) or [Ru2(mu-O2CR)4]BF4 (R=2-benzofuryl). The axial positions of these compounds can be occupied by OPPh3 to give the corresponding [Ru2(mu-O2CR)4(OPPh3)2]BF4. The compounds have been characterized by analytical, spectroscopic and magnetic data. The structure of [Ru2(mu-O2CC4H3S)4(OPPh3)2]BF4*2H2O has been determined by X-ray crystallography. The dinuclear cation has two ruthenium atoms linked by four bridging thiophene-2-carboxylate ligands and two OPPh3 ligands coordinated to axial positions, with an Ru-Ru distance of 2.2747(11) A.
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Reference£º
Benzofuran – Wikipedia,
Benzofuran | C8H1734O – PubChem