Process for preparing cis-olefins
AssigneeHoechst Aktiengesellschaft
InventorsHans Jurgen Bestmann, Werner Theo Stransky, Otto Vostrowsky
Life of this patent
Estimating the term…
Abstract
A process for preparing cis-olefins of the formula ##STR1## where R is alkyl or alkenyl and R.sup.1 is alkyl and alkenyl, both optionally substituted by hydroxy, carbalkoxy or acyloxy, which comprises an ylide solution of the compound R--CH.sub.2 --P.sup.+ (C.sub.6 H.sub.5).sub.3 Br.sup.- in hexaalkyl phosphoric acid triamide and adding an aldehyde of the formula R.sup.1 --CHO.
Claims18
An improved process for preparing cis-olefins of the formula ##STR5## wherein R is straight-chain or branched (C.sub.1 -C.sub.15) alkyl or (C.sub.2 -C.sub.15) alkenyl and
- R.sup.1 is a straight-chain or branched (C.sub.1 -C.sub.20) alkyl or (C.sub.2 -C.sub.20) alkenyl group, which process comprises dissolving potassium in a hexaalkylphosphoric acid triamide, adding to the solution obtained a phosphonium salt of the formula
- R--CH.sub.2 --P.sup.+ (C.sub.6 H.sub.5).sub.3 Br.sup.-, I
- and adding to the reaction mixture obtained an aldehyde of the formula ##STR6## and isolating the product obtained.
An improved process for preparing cis-olefins of the formula ##STR8## wherein R is straight-chain or branched (C.sub.1 -C.sub.15) alkyl or (C.sub.2 -C.sub.15) alkenyl and
- R.sup.1 is a straight-chain or branched (C.sub.1 -C.sub.20) alkyl or (C.sub.2 -C.sub.20) alkenyl group, which process comprises dissolving sodium in a hexaalkylphosphoric acid triamide, adding to the solution obtained a phosphonium salt of the formula
- R--CH.sub.2 --P.sup.+ (C.sub.6 H.sub.5).sub.3 Br.sup.-, I
- and adding to the reaction mixture obtained an aldehyde of the formula ##STR9## and isolating the product obtained.
Dependencies are inferred from the claim text.