2208. ------ [MCKEEVER, C. H.] (Rohm & Haas Co.). Promoter in the Manufacture of Cobalt Carbonyl. United States Patent 2,477,554, July 26, 1949. Chem. Abs., vol. 43, 1949, p. 8108.

The Co to be converted as in United States Patent 2,477,553 (abs. 2207), is supplied as a toluene-soluble salt of an organic acid free of elements other than C, H, and O and nonbenzenoid unsaturation, and reaction is effected in an inert hydrocarbon solvent. Carboxylic acids with 6-22 C atoms are preferred. Thus, 50 ml. of a solution (3% Co) of Co nonanoate in C₆H₆-MeCOEt (4:1) and 2 ml. of a 6% solution of (I) in MeCOEt was autoclaved at 120° -125° and 2,500 p. s. i. of CO and H₂ (1:1) to give a quantitative yield of (I) in less than 10 min. Co naphthenate in toluene-MeCOEt (4:1) and Co 2-ethylhexanoate in C₆H₆MeCOEt (6:1) similarly gave quantitative yields, the latter at 3,000 p. s. i. and 130° . Without (I) as promoter the latter run gave only 35% (I) in 3 hr. at 130° .