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.