Potentially carcinogenic cyclopenta[a]phenanthrenes. Part VI. 1,2,3,4-Tetrahydro-17-ketones

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Abstract
Cyclisation of 2-oxo-5-(5,6,7,8-tetrahydro-2-naphthyl)cyclopentaneacetic acid led to both angular and linear ring-fused products from which were derived 1,2,3,4,15,16-hexahydrocyclopenta[a]phenanthren-17-ones and 1,2,7,8,9,10-hexahydrocyclopent[a]anthracen-3-ones.