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(2E,6E)-farnesyl diphosphate = (+)-germacrene D + diphosphate
(2E,6E)-farnesyl diphosphate = (+)-germacrene D + diphosphate
the initial step is abstraction of the diphosphate moiety under ring closure to yield germacrenyl cation. The next step is a 1,2-hydride shift of H-7 into the isopropyl group, generating a germacrenyl cation with the positive charge at position 7. The cation undergoes a 1,2-hydride shift of H-6 yielding a cation with positive charge at position 6. During this step the configuration at C-7 is fixed. Finally, the cation is deprotonated at C-15 and the positive charge is quenched by two electron pair shifts to generate (+)-germacrene D
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