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US 12,410,117 B2Granted
Process for production of vitamin A
AssigneeDsm IP Assets B.V.
InventorsWerner Bonrath, Marc-André Mueller, Bettina Wuestenberg, Viktor Zimmermann
Life of this patent
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Abstract
The present invention relates to a new process for the production of vitamin A and/or its derivatives.
Claims15
A process for the production of the compound of formula (III)
- wherein R is H or —(CO)—(CH2)nCH3, wherein n has a value of 0-14, or
- R is —X(C1-4alkyl)3 or —X(C6H5)3, wherein X is Si or Ge, or
- R is tetrahydro pyrane, isopropylmethyl ether or 2-methoxy-butylether, wherein the process comprises:
- (i) conducting a first step of treating a compound of formula (I):
- with heat to form a compound of formula (II):
- wherein R in the formulas (I) and (II) has the same meaning as defined for the compound of formula (III), and then
- (II) conducting an elimination reaction in a second step to convert the compound of formula (II) into the compound of formula (III).
4 more elements
A compound of formula (II):
- wherein
- R is H or —(CO)—(CH2)nCH3, wherein n has a value of 0-14, or
- R is —X(C1-4alkyl)3 or —X(C6H5)3, wherein X is Si or Ge,
- or R is tetrahydro pyrane, isopropylmethyl ether or 2-methoxy-butylether.
1 more element
Dependencies are inferred from the claim text.