Process for the manufacture of gamma-acetoxytiglic aldehyde
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United States of America Patent
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Sep 26, 1995
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N/A
app pub date -
Sep 30, 1994
filing date -
Oct 13, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A novel process for the manufacture of .gamma.-acetoxytiglic aldehyde ('C.sub.5 -aldehyde'), which is known as an important starting material for the production of vitamin A acetate from a (.beta.-ionylidenethyl)triphenylphosphonium halide and C.sub.5 -aldehyde, comprises treating a pentenyn-3-ol of the formula HC.tbd.C--C(CH.sub.3)(OH)--CH.dbd.C(R).sub.2 (II), wherein both R's signify either hydrogen or methyl, with ozone, preferably in a lower alkanol R.sup.1 OH, wherein R.sup.1 signifies C.sub.1-4 -alkyl, to obtain an aldehyde 2-hydroxy-2-methyl-3-butynal of the formula HC.tbd.C--C(CH.sub.3)(OH)--CHO (III). The aldehyde III may be converted to the C.sub.5 -aldehyde by conventional means.
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