Carboxylato triphenylphosphine Complexes of the Platinum Metals

Submitted by ALAN DOBSON, STEPHEN D. ROBINSON, and MICHAEL F. UTTLEY Checked by G. W. PARSHALLt 

Carboxylic acids and their conjugate bases, the carboxylate anions, feature extensively in homogeneous catalysis systems.1 7 In addition, the carboxylate anions are very versatile ligands capable of coordinating in unidentate, 

Acetic acid (1.0 mL) is added to a suspension of tricarbonylbis(triphenyl-phosphine)ruthenium (0.23 g) in 2-methoxyethanol (5.0 mL), and the mixture is heated under reflux for 15 min. The resultant solution is filtered, cooled in ice, diluted with methanol (5.0 mL), and then allowed to stand at 0° until crystallization is complete. The pale-yellow or white crystalline precipitate is washed successively with methanol (2x2 mL) at 0°, water (2x5 mL), and methanol (2x2 mL) at 0°, then dried in vacuo at 100°. 

Acetic acid (1.0 mL) is added to a suspension of carbonyldihydridotris-(triphenylphosphine)ruthenium (0.67 g) in 2-methoxyethanol (7.5 mL), and 

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