| 摘要 |
<p>1396623 Sulphones having a 1,5-dimethylhexa-1,5-dienylene group; carotene RHONEPOULENC SA 2 Feb 1973 [2 Feb 1972 10 April 1972] 5368/73 Headings C2C and C2V The invention comprises compounds of the formula wherein the sulphonyl group -SO 2 R replaces a H atom on C atom (a) or (b), R is alkyl, alkenyl, aralkyl, alkaryl or aryl each of which may be substituted by substituents which are electron donors or acceptors, each of A and Q represents (a) a hydrocarbon radical containing 5 n+1 carbon atoms (n being an integer from 1 to 5) which may be substituted; (b) -CH 3 which may be substituted by halogen, -SR<SP>1</SP> or -SO 2 R<SP>1</SP> wherein R<SP>1</SP> is alkyl, aryl, or aralkyl which may be substituted, (c) -CH 2 OH, an ether or ester thereof; (d) a free or protected -CHO group; (e) -COOH or an ester thereof, COCl or CN; with the proviso that Q and A are not both (2,6,6 - trimethylcyclohex - 1 - enyl) - 4 - methylhexa-1,3,5-trienyl, and that the compound of Formula I does not contain any groupings of the formula They may be obtained (1) by reacting a compound of the formula with a compound of the formula wherein one of X and Y is halogen and the other is SO 2 R, in the presence of a basic agent capable of converting the compound in which X or Y is SO 2 R into an anion; (2) when the sulphone group replaces a H atom on C atom (a), by reacting a compound of the formula with a compound of the formula wherein Q<SP>1</SP>H corresponds to Q, in the presence of an alkaline agent; or (3) when the sulphone group replaces a H atom on C atom (b), by reacting a compound of the formula with a compound of the formula wherein A<SP>1</SP>H corresponds to A, in the presence of an alkaline agent. Examples are given which illustrate these processes. Compounds containing the grouping or the grouping are obtained by desulphonating a sulphone of Formula I by treatment with a base or by reduction respectively. An example is given in which #-carotene is prepared.</p> |
