“…4a-Carbomethoxy-4|8,10|8-dimethyl-traris-decal-3d-ol (41). Reduction of 0.399 g (1.7 mmol) of 27 with NaBH4 in exactly the same manner as 12 afforded 0.411 g of crude oily product which was purified by preparative TLC, using 2:1 hexane-ether twice, to afford 0.088 g (21%) of material tentatively identified as 4«-carbo-' methoxy-4/3,10/3-dimethyl-trarcs-decal-3a-ol, 0.29 g (72%) of 41, and 0.020 (5%) of polar material, presumably diol. Compound 41 was sublimed thrice at 70°( 15 mm) to yield 0.150 g (37%) of white needles: mp 87-88°; ir 3400 and 1740 cm-1; NMR 0.95 (s, 3,10/3-H3C-), 1.10 (s, 3, 4/3-H3C-), 3.66 (s, 3, H3COOC-), and 4.00 ppm (br t, 1, 3a-H).…”