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An alternative pathway was suggested by one of the referees, namely that the reaction of 7 could give 5 initially, followed by subsequent isomerization to 4. Two arguments detract from this possibility. First, it would require very selective equatorial addition of diethylzinc to 9, which appears unlikely considering the high axial selectivity observed throughout this work. Second, the isomerization of 5 to 4 would need to account for the observed 5:94 ratio, where the expected equilibrium ratio is 50:50. The alternative pathway thus requires a contra-thermodynamic equilibration and cannot account for the bulk of the product.
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