Geiger counter: The first total synthesis of geigerin (3), a member of the guaian-8,12-olides, has been achieved in eight regio- and stereocontrolled steps from the tropylium cation. En route, the guaian-6,12-olide 2 is formed in two steps from the hydroazulenone 1, a versatile intermediate.
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Carret et al. (2007) studied this question.
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