Preparation of substituted cyclopentadienes
AssigneeAlbemarle Corporation
InventorStephen E. Belmont
Life of this patent
Estimating the term…
Abstract
A process is provided for preparing an substituted cyclopentadiene by the steps of (a) reacting a vinyl ketone with a vinyl organometallic compound to form a divinyl tertiary alcohol and (b) dehydrating/cyclizing the tertiary alcohol such as with an acid and/or heat to form the substituted cyclopentadiene.
Claims3
A process for preparing a substituted cyclopentadiene said process comprising the steps of (a) reacting a vinyl ketone with a vinyl organometallic compound to form a divinyl tertiary alcohol and (b) dehydrating/cyclizing said alcohol to form said substituted cyclopentadiene in the presence of an acidic cation exchange resin, wherein (a) said vinyl ketone has the formula HCR.sup.1 .dbd.CR.sup.2 C(O)R.sup.3, wherein R.sup.1 is hydrogen or C.sub.1 to C.sub.30 alkyl and R.sup.2 and R.sup.3 are independently C.sub.1 to C.sub.30 alkyl, (b) said vinyl organometallic compound has the formula HCR.sup.5 .dbd.CR.sup.4 M, wherein R.sup.4 is C.sub.1 to C.sub.30 alkyl, R.sup.5 is hydrogen or C.sub.1 to C.sub.30 alkyl and M is Li, Na or MgX, where X is halogen, and (c) at least one of R.sup.1 and R.sup.5 is hydrogen.
Dependencies are inferred from the claim text.