Selective hydrogenation of cyclopentadiene to form cyclopentene

Details Selective hydrogenation of cyclopentadiene to form cyclopentene Selective hydrogenation of cyclopentadiene to form cyclopentene

1978-08-30

1980-05-20

O'Keefe, Veronica

Chemistry of hydrocarbon compounds

Adding hydrogen to unsaturated bond of hydrocarbon, i.e.,...

Partial

585271, 585272, 585277, C07C 506, C07C 516, C07C 1312

Patent

active

042040817

ABSTRACT:
There is disclosed a process for the preparation of cyclopentene which comprises selectively hydrogenating cyclopentadiene in a liquid phase by contacting cyclopentadiene with hydrogen in the presence of a hydrogenation catalyst comprising (1) a soluble nickel compound, (2) an organoaluminum compound or a lithium alkyl compound, and (3) at least one cocatalyst compound selected from the group consisting of H.sub.2 O; NH.sub.3 ; ROH where R is an alkyl or a halogenated alkyl radical containing from 1 to 20 carbon atoms; ##STR1## where R.sub.1, R.sub.2 and R.sub.3 may be hydrogen, or an alkyl radical containing from 1 to 6 carbon atoms; ##STR2## where R.sub.1, R.sub.2 and R.sub.3 may be hydrogen or halogen, or an alkyl radical containing from 1 to 6 carbon atoms; R.sub.1 O R.sub.2 wherein R.sub.1 and R.sub.2 may be the same or different alkyl radicals containing from 1 to 6 carbon atoms; and ##STR3## wherein R.sub.1 may be alkyl or an aromatic radical containing from 1 to 8 carbon atoms and R.sub.2 may be hydrogen or an alkyl or aromatic hydrocarbon radical containing from 1 to 8 carbon atoms.

REFERENCES:
patent: 3022359 (1962-02-01), Wiese et al.
patent: 3360577 (1967-12-01), Pickles
patent: 3937745 (1976-02-01), Wideman et al.
patent: 4112007 (1978-05-01), Sanfilippo et al.

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