Bp Chemicals Limited

Derek K MacAlpine

Alexander G Kent

Malcolm J Lawrenson

David Lyons

An isobutenylcyclohexene (IBCH) is produced by reacting under disproportionation conditions an isoolefin with a vinylcyclohexene (VCH), or by reacting an isoolefin and a compound derivable from a VCH by homodisproportionation involving the elimination of ethylene, in the presence of a supported rhenium heptoxide disproportionation catalyst promoted with at least one transition metal in the form of the elemental metal and/or an oxide thereof, for example either copper or zinc.

Process for the production of an isobutenylcyclohexene

2,3-dimethylbutene-1 (2,3-DMB1) is produced from propene by a process comprising the steps of:

Process for the production of 2,3-dimethylbutene-1 from propene

An isobutylbenzene (IBB) is produced from an isobutenylcyclohexane (IBCH) by contacting at elevated temperature the IBCH in the presence of a molecular oxygen-containing gas with a catalyst comprising a supported transition metal in the form of the elemental metal and/or a compound thereof, for example palladium supported on alumina.

Process for the production of isobutylbenzene from an

A process for the production of isobutylbenzenes in particular, isobutylbenzene itself, is provided. The process is in two stages and comprises (1) reacting a vinylcyclohexane with an isoolefin of formula (R)(R.sup.1)C.dbd.C(CH.sub.3).sub.2 in the presence of a dismutation catalyst to produce an isobutenylcyclohexene and (2) contacting the isobutenylcyclohexene with a dehydroisomerisation catalyst to produce an isobutylbenzene. Examples of vinylcyclohexenes which can be used include 4-vinylcyclohexene and styrene.

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Haywards Heath, United Kingdom

Derek K MacAlpine