Process for preparing conjugated dienes using substituted rheniu

Details Process for preparing conjugated dienes using substituted rheniu Process for preparing conjugated dienes using substituted rheniu

1998-07-13

1999-07-27

Caldarola, Glenn

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

Diolefin product

585629, C07C 120, C07C 509

Patent

active

059292989

ABSTRACT:
This invention provides a process for preparing conjugated dienes using certain substituted rhenium compounds as catalysts. The substituted rhenium compounds have the formula R.sub.5 ReO.sub.3, wherein R.sub.5 is selected from the group consisting of C.sub.1 -C.sub.10 alkyl, aryl, aryl-C.sub.1 -C.sub.10 alkyl, cyclopentadienyl and cyclopentadienyl substituted with one to four C.sub.1 -C.sub.4 alkyl groups. The process of the invention thus provides a facile method for preparing conjugated dienes using the corresponding tertiary vinyl alcohol as starting material. Examples of such starting materials includes phytols, manool, 5-vinyl-5-nonanol, 1-vinyl4-tert-butylcyclohexanol, and 1-vinylcyclooctanol. The process can be carried out neat as well as in an inert solvent in the gas or solution phase.

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