2465.     NIENBURG, H. J.  [Work on the Oxo Reaction 1940-1944.]  BIOS Misc. Rept. (in German) 113, 1947, Appendix II, 16 pp.; BIOS Final Rept. 1646, 1946, pp. 30-47, PB 91,685.

        Changes in constitution brought about by the Oxo reaction were examined with pure olefins such as cetene and dodecylene.  Independent of the purity of the initial olefin, a large number of isomeric oxo alcohols or acids were obtained.  Special Oxo reactions were carried out with olefins from first-running ketones, Fischer-Tropsch synthesis olefins, di- and tri-isobutylene, cracking olefins and with unsaturated, O-containing olefins.  The latter did not yield uniform Oxo products.  By treating olefins with NH₃ and CO acid amides were obtained.  With isobutylene and generally, with all olefins having the double bond between tertiary and quaternary C atoms, it was found that the formyl grouping goes solely to the tertiary C atom.  Work was done on building up high knock-rating hydrocarbons, using the Oxo reaction and starting with isobutylene, trimethylethylene, 2,4-dimethylpentene-2, disobutylene and tetramethylethylene.  It was found that these compounds avoid an increase in branching by a double-bond shift which precedes addition.  In contrast tot he Oxo reaction, 1,3-dioxanes give with tetramethylethylene, trimethylethylene and 2,4-dimethylpentene-2, the desired highly branched primary alcohols after hydrogenation.  The oxation of propylene was intensively studied in a trickle (Riesel) apparatus, and a sump-phase apparatus was developed to handle 5 l. liquid propylene/hr.  Propylene yielded equal quantities of normal- and isobutyl-aldehyde and the corresponding alcohols on hydrogenation.

        NIERHAUS, H.  See abs. 2043.