A Facile and Practical Procedure for the Synthesis of 8-Hydroxy-4-oxochroman Derivatives

REFERENCES AND NOTES

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• Technical grade m-CPBA (TCI, 70% purity) used contained up to 13% of water. Our private assessment shows that the water content of commercial m-CPBA ranges 0.09–18% and varies with the supplier and the lot. Anhydrous m-CPBA was purchased in bulk from Sanken Kako Corp.
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• This was assumed to be a macrocyclic dimer (below): MS (EI) m/z, 55, 364, 237, 182; mp 238°C.
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