Chlorocarbonylbis triphenylarsine rhodium

CHLOROCARBONYLBIS-(TRIPHENYLPHOSPHINE)RHODIUM AND CHLOROCARBONYLBIS(TRIPHENYLARSINE)-RHODIUM 

Checked by Loren G. Lipson,) Michael L. Maddox,) and Herbert D. Kaesz t 

Dichlorotetracarbonyldirhodium reacts readily with phosphines and arsines to form the four-coordinate phosphine or arsine carbonyl chlorides. - The complexes may also be prepared by refluxing rhodium (III) chloride 3-hydrate with a large excess of triphenylphosphine or triphenylarsine in 2-methoxyethanol.  

Caution. The reaction is carried out in a well-ventilated hood. 

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Chlorocarbonylbis(triphenylphosphine)rhodium and chlorocarbonylbis(triphenylarsine)rhodium form bright yellow crystalline solids which are readily soluble in chloroform and dichloromethane, moderately soluble in benzene and carbon tetrachloride, and sparingly soluble in ether and aliphatic hydrocarbons. The phosphine complex (m.p. 195 to 197°) and the arsine complex (m.p. 242 to 244°) are reported to have carbonyl stretching frequencies (using KBr disks) at 1960 and 1963 cm., respectively. ... 

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