Abstract Lithium borotritide reduction of α-ionylidene-acetaldehyde (5) followed by manganese dioxide oxidation provided the tritiated aldehyde (9) which retainad over 95% of the label. On treatment with the ylide derived from ethyl 4-chloro-3-methylcrotonate, ethyl α- retinoate-11-3 H (14) was obtained which, after purification, was hydrolyzed to α-retinoic-11- 3 H acid (15). Conversion to the methyl ester (16) followed by lithium aluminum hydride ...
![[(2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethylcyclohex-2-en-1-yl)nona-2,4,6,8-tetraenyl] acetate Structure](https://image.chemsrc.com/caspic/011/53250-57-0.png)