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The selection of the E / Z mixture of 3 was made on the basis of economic reasons with respect to both expensive isolated stereoisomers. Moreover, it was anticipated that an E / Z mixture of (±)- 6 should render the same compound after the ring-closing-metathesis step. All these compounds (4 - 6) were prepared as E / Z isomers and no effort to isolate them was attempted.
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The selection of the E / Z mixture of 3 was made on the basis of economic reasons with respect to both expensive isolated stereoisomers. Moreover, it was anticipated that an E / Z mixture of (±)- 6 should render the same compound after the ring-closing-metathesis step. All these compounds (4 - 6) were prepared as E / Z isomers and no effort to isolate them was attempted.
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