Trans‐[13,14‐14C2]‐Retinoic acid has been synthesized by condensation of β‐ionylideneacetaldehyde and 14C‐labeled methyl senecioate in the presence of potassium amide in ether. A convenient synthesis of the key intermediate, methyl (diethoxyphosphinyl)‐[2‐14C]acetate, is also described.

propenyll-benzoic acid, (TTNPB), are described. Tritium was introduced by catalytic hydrogenation. The final product, TTNPB-3H2 (2). had a specific activity of 24.1 Ci/mmole and a radiochemical purity of 95.6%.

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SUMMARYtran~-Retinal-ll-~H was photolyzed by a fluorescent source to afford a mixture of isomeric retinals, from which 1 1 -ereti~~al-ll-~H was isolated by HPLC