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. Author manuscript; available in PMC: 2013 Dec 26.
Published in final edited form as: J Am Chem Soc. 2012 Dec 11;134(51):20844–20848. doi: 10.1021/ja311022s

Figure 1.

Figure 1

Proposed formation of MW 71 and 70 isoprene (4) products (Scheme 2) from (Z)- and (E)-[4,4,4-2H3]DMADPs via 10. This reaction could be concerted via a 6-membered ring transition state involving inorganic pyrophosphate, or it could proceed in a stepwise fashion through the re-formation of allylic carbocation intermediate 7.