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An improved total synthesis of racemic strigol (1) and 4 '-epistrigol (21) from -ionone in 10 (4.4% overall yield) or 12 steps (6.8% overall yield) by recycling isomer 16 is described which is applicable on a multigram scale with a minimum of purification steps. The synthetic scheme also allows efficient access to many analogues for evaluation of structure-activity relationships.Strigol (1) was isolated in small amounts from root exudates of cotton (Gossypium hirsutum L.) and identified by Cook and co-workers.1 Strigol was found to be a potent seed germination stimulant for striga species and similar parasitic plants in the genus Orobanche.1 2 It is presently the most potent seed germination stimulant known for

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