4,4-Dimethyl effect (2). Syntheses, 1H- and 13C-nuclear magnetic resonance spectra, and the conformations of 6.ALPHA.- and 6.BETA.-substituted-1,1,10.BETA.-trimethyl-trans-decal-2-ones (8.ALPHA.- and 8.BETA.-substituted-4,4,10.BETA.-trimethyl-trans-decal-3-ones), models of 4,4-dimethyl-steroid- and triterpenoid-3-ketones.

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