Process for the preparation of tetrahydropyran derivatives...

Details Process for the preparation of tetrahydropyran derivatives... Process for the preparation of tetrahydropyran derivatives...

C - Chemistry, Metallurgy

07

C

260/626, 260/631

C07C 29/00 (2006.01) C07C 33/00 (2006.01) C07D 309/04 (2006.01)

Patent

CA 1037961

THE ABSTRACT OF THE DISCLOSURE Di-alkenyl substituted tetrahydropyrane as well as higher alcohols are produced by reacting a conjugated diene, like butadiene or isoprene with an aldehyde like formaldehyde and acetaldehyde in the presence of a salt or chelate or coordination compound of Pd or Pt in their oxidation state +2 and a ligand of the type YR3 or Y(OR)3, wherein R is a hydrocarbyl group and Y is phosphorus or arsenic. The alcohols contain carbon numbers equal to the double amount present in the diolefin plus the amount present in the aldehyde. The products can be saturated for instance by introducing hydrogen using the same catalyst. The unsaturated cyclic ethers are useful as chemical inter- mediates and polymerizable monomers, and the hydrogenation products of the cyclic ethers are useful as high-boiling solvents.

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