Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-10-17
1976-05-18
Patten, James A.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
252431N, 252431P, 2603436, 260468R, 260469, 260476R, 260488R, C07C 6800, C07D30720, C07D30788
Patent
active
039578275
ABSTRACT:
.gamma.-Lactones may be selectively prepared by the hydrogenation of cyclic carboxylic acid anhydrides under mild conditions in a homogeneous solution in the presence of a ruthenium catalyst of the formula ##EQU1## WHEREIN X is hydrogen, chlorine, bromine, iodine, or lower alkyl; n is an integer of from 0-2, but when n is 2, X may be the same or different; L is a neutral ligand, olefin, or CO; y is an integer of from 0-3, but when y is 2 or 3, L may be the same or different; R.sub.6, R.sub.7 and R.sub.8 are lower alkyl, cycloalkyl of from 5 to 15 carbon atoms, aryl, benzyl, or a bidentate ligand, and each of the R groups may be the same or different; and x is an integer of from 1-3.
In a like manner, esters may be prepared in high yields by the selective hydrogenation of acyclic carboxylic acid anhydrides.
REFERENCES:
patent: 2072861 (1937-03-01), Amend et al.
patent: 2772292 (1956-11-01), McShane et al.
patent: 2867628 (1959-01-01), Cass
patent: 3110747 (1963-11-01), Mullineaux
patent: 3312718 (1967-04-01), Woskow
patent: 3492314 (1970-01-01), Asano et al.
Back Stanford M.
Hess J. Edward
Johnson Donald R.
Patten James A.
Sun Ventures, Inc.
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