Process for preparing polyenedialdehyde monoacetals
AssigneeBASF SE
InventorsHansgeorg Ernst, Klaus Henrich
Life of this patent
Estimating the term…
Abstract
A process for preparing compounds of the formula I 1 is described and entails converting a compound of the formula II 2 by Wittig or Wittig-Horner reaction into a compound of the formula IV, 3 where appropriate converting the compound of the formula IV by hydrolysis of the acetal function and Wittig or Wittig-Horner reaction into a compound of the formula VI 4 and converting the compound of the formula IV or VI in two stages into the compound of the formula I. The radicals R1, R2 and R6 and k have the meaning indicated in the description. Novel intermediates are also described.
Claims10
A process for preparing compounds of the formula I
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- in which
- a) a compound of the formula II
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- is reacted with a reagent of the formula III
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- to obtain a compound of the formula IV,
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- b) optionally, the compound of the formula IV is treated to hydrolyze the acetal function thereof, and reacted with a reagent of the formula V
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- to obtain a compound of the formula VI
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- c) the compound of the formula IV or VI is reduced to obtain a compound of the formula VII
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- d) the compound of the formula VII is oxidized to obtain the compound of the formula I,
- in which R1 and R2 are, independently of one another, C1-C8-alkyl or, together with the oxygen atoms to which they are bonded, and with the carbon atom located between them, are
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- in which R3 R4 and R5 are, independently of one another, hydrogen or C1-C4-alkyl,
- R6 is C1-C8-alkyl,
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- is a triarylphosphonium or phosphonic acid dialkyl ester radical, and
- k is 0 or 1.
A compound of the formula
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- in which R1 and R2 are, independently of one another, C1-C8-alkyl or, together with the oxygen atoms to which they are bonded, and with the carbon atom located between them, are
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- in which R3, R4 and R5 are, independently of one another, hydrogen or C1-C4-alkyl,
- R6 is C1-C8-alkyl, and
- k is 0 or 1,
- where R5 is not hydrogen if k is 0 and R6 is methyl.
A compound of the formula
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- in which R1 and R2 are, independently of one another, C1-C8-alkyl or, together with the oxygen atoms to which they are bonded, and with the carbon atom located between them, are
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- in which R3, R4 and R5 are, independently of one another, hydrogen or C1-C4-alkyl, and
- k is 0 or 1.
A compound of the formula
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- in which R1 and R2 are, independently of one another, C1-C8-alkyl or, together with the oxygen atoms to which they are bonded, and with the carbon atom located between them, are
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- in which R3, R4 and R5 are, independently of one another, hydrogen or C1-C4-alkyl, and
- k is 0 or 1,
- where R3 and R4 are not both methyl.
Dependencies are inferred from the claim text.