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US 12,479,814 B2Granted
Process for production of new sulfolenic intermediates
AssigneeDsm IP Assets B.V.
InventorsWerner Bonrath, Marc-André Mueller, Bettina Wuestenberg, Viktor Zimmermann
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Abstract
The present invention relates to a new process for the production of new specific intermediates, which are preferably used in the production of vitamin A, vitamin A acetate, or β-carotene and derivatives thereof, e.g. canthaxanthin, astaxanthin or zeaxanthin.
Claims13
A process of the production of compounds of formula (I):
- 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 reacting a compound of formula (II):
- with a compound of formula (III):
- to obtain the compound of formula (I), wherein
- R in formula (III) has the same meanings as in formula (I).
5 more elements
A compound of formula (I):
- 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.