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. Can. J. Chem. 69,590 (1991). The desulfurization of benzo [b]thiophene 1 with aqueous transition metal species in the presence of various hydrocarbons at elevated temperatures is described. Mechanistic studies have shown that treatment of 1 with solutions of RuC13 and other platinum metal species results in the formation of 2,3-dihydrobenzo[b]thiophene 2 and ethylbenzene 3 as major products. Metal coordinated species are probable intermediates in the formation of 2 and hydrocarbon products. 2 readily coordinates to PdCI2 to form square-planar trans-dichlorobis(2,3-dihydrobenzo[b]thiophee) palladium(II), which decomposes to ethylbenzene at 300°C. The crystal structure of the complex was determined by a single crystal X-ray diffraction study. The complex crystallized in the monocliriic space group C 2 / c with Z = 8 in a cell of dimensions a = 23.057 (3), b = 9.71 1 (1), c = 15.227 (2) A and p = 99.74(1)". The structure was solved by the Fourier method and was refined by full-matrix least-squares calculations to R = 0.042 for 2537 observed data with I > 2.5u(I).

. Can. J. Chem. 71, 199 (1993). [Traduit par la redaction] Introduction We previously (1) reported the preparation and structural determination of trans-dichloro bis(2,3-dihydrobenzo[b]thiophene)palladium(II) l a , which was of interest regarding mechanisms for the catalytic hydrodesulfurization of benzo-[blthiophene (BT) and the reaction of BT with water at elevated temperatures in the presence of aqueous latinum trans-Dichlorobis

Reactions of Benzo(b)thiophene with Some Aqueous Platinum MetalSpecies at Elevated Temperatures.-Catalytic hydrodesulfurization of (I) with aqueous RuCl3 and other platinum metal species in the presence of various hydrocarbons produces the compounds (II) and (III) as major products. Initial coordination via π-interaction, hydrogenation of the 2,3-bond, followed by hydrogenolysis to form (III) is discussed as a suitable mechanism and confirmed by formation of the complex (V) (space group C2/c; Z = 8) and its decomposition to (III) at 300 • C. -(CLARK, P. D.; FAIT, J. F.; JONES, C. G.; KIRK, M. J.; Can. J. Chem. 69 (1991) 4, 590-598; Dep. Chem., Univ. Calgary, Calgary, Alberta, Can. T2N 1N4; EN)