Process for the preparation of cis-6-hexadecenoic acid

   
   

The invention relates to a process for the preparation of cis-6-hexadecenoic acid of the formula I, ##STR1## which comprises reacting a.sub.1) a triphenylphosphonium salt of the formula II, R.sup.1 OOC--(CH.sub.2).sub.5 --P(R.sup.2).sub.3.sup.+ X.sup.- II with decanal of the formula III H.sub.3 C--(CH.sub.2).sub.8 --CH.dbd.O III or a.sub.2) a triphenylphosphonium salt of the formula IV, H.sub.3 C--(CH.sub.2).sub.9 --P(R.sup.2).sub.3.sup.+ X.sup.- IV with an aldehyde of the formula V, R.sup.1 OOC--(CH.sub.2).sub.4 --CH.dbd.O V in a Wittig reaction, and b) saponifying the ester, formed by process step a.sub.1) or a.sub.2), of the formula VI, ##STR2## where the substituents R.sup.1, R.sup.2 and X.sup.- have the meanings given in the description.

La invención se relaciona con un proceso para la preparación del ácido de cis-6-hexadecenoic del fórmula I, el ## que abarca reaccionar a.sub.1) una sal del triphenylphosphonium del fórmula II, R.sup.1 OOC -- (CH.sub.2).sub.5 del ## STR1 -- P(R.sup.2).sub.3.sup.+ X.sup. - II con decanal del fórmula III H.sub.3 C -- (CH.sub.2).sub.8 -- CH.dbd.O III o a.sub.2) una sal del triphenylphosphonium del fórmula IV, H.sub.3 C -- (CH.sub.2).sub.9 -- P(R.sup.2).sub.3.sup.+ X.sup. - IV con un aldehino del fórmula V, R.sup.1 OOC -- (CH.sub.2).sub.4 -- CH.dbd.O V en una reacción de Wittig, y b) saponificando el éster, formó por el paso de proceso a.sub.1) o a.sub.2), del fórmula VI, del ## del ## STR2 donde los sustitutos R.sup.1, de R.sup.2 y de X.sup. - tenga los significados dados en la descripción.

 
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