SCHEDULED MAINTENANCE
Addition of dibromocarbene to the 5(10)-double bond of the bisketal produced by the action of ethylene glycol and acid on 1,4-dihydro-9β-oestrone 3-methyl ether 17-(ethylene ketal), followed by reduction and fission of the cyclopropane ring leads chiefly to (+)-9β-androst-4-ene-3,17-dione, but the product contains some ‘retro’-androstenedione.
A. J. Birch and G. S. R. S. Rao, J. Chem. Soc. C, 1967, 2509 DOI: 10.1039/J39670002509
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