- PROCESS FOR THE PREPARATION OF OXOVINYLIONOL AND ITS O-PROTECTED DERIVATIVES
-
The present invention relates to the preparation of oxovinylionol and its O-protected derivatives of the formula I in which R is hydrogen or an OH protecting group, for example a group Si(Ra)3, by reacting a compound of the general formula II in which R has the meanings given above for formula I, i.e. β-vinyl ionol (formula II, R=hydrogen) or an O-protected derivative thereof (formula II, R═OH protecting group) with an oxidant in the presence of at least one transition metal, where the oxidant comprises at least one oxygen-containing compound which is selected from among hydrogen peroxide and organic hydroperoxides.
- -
-
Paragraph 0138
(2013/05/21)
-
- Astaxanthin intermediates
-
The present invention related to novel compounds useful in the manufacture of astaxanthin and to processes for their preparation. The novel intermediates have the formula STR1 wherein R1, R2 and R3 independently are C
- -
-
-