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°Cdoes not destroy HNOg, however. The presence of up to x/2 mL of HNOg does not interfere with the fluorometric analysis of Se. The 2 • 01 in the stabilizing solution helps minimize oxidation of the DAN by HNOg (9). ACKNOWLEDGMENTThe authors thank D. Scherer and A. Jacobson for providing the tomato leaf sample and the value for its Se content obtained by using the HN03/HC104 digestion method.

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trans -Pent -3-en-2-01 and trans-1,3-diphenylprop-2-en-l-ol have been thermally isomerized to the saturated ketones 2-pentanone and 3-phenylpropiophenone. Rearrangements of mixtures of trans-2-deuterio-and transl,l,l-l.rideutcriopent-3-en-2-ol gave 2-pentanone and recovered starting material, indicative of extensive intermolecularity a t some stage in the reaction. Rearrangement of undeuterated and trans-l-deuterio-l-pentadeuteriophenyl-3-phenylprop-2-en-l-olI however, indicated intramolecular hydrogen transfer.

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