Synthesis of 8-, 9-, 12-, and 13-mono-13C-retinal

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Abstract
The 8-, 9-, 12- and 13-mono-13C-retinals were synthesized with > 98% chemical purity and 93% 13C incorporation from 13C-labeled acetonitrile. Their 13C.sbd.13C and 13C.sbd.1H NMR coupling constants were determined.