The Synthesis of C-13 Labeled Vitamin E, [2a-13C]all-rac-a-Tocopherol

Abstract
Vitamin E with a 13C-labeled isoprenoid side chain, [2a-13C]all-rac-.alpha.-tocopherol, was synthesized by condensation of trimethylhydroquinone with a mixture of [3a-13C]phytol and its geometrical isomer. The 13C-labeled phytol was prepared using 5,9,13-trimethyltetradecan-1-al as an intermediate and [13C]methyl iodide as a 13C source. The total yield of the labeled .alpha.-tocopherol was 65.4% on the basis of [13C]methyl iodide.
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