The effects of 3-halo substitution on face selection in borohydride reductions of both nor-and homoadamantan-9-ones 1-X and 3-X, respectively, have been compared with those of 5- halo substitution in the parent 5-haloadamantan-2-ones 2-X. The differences between the product ratios in these three compounds are small, but the selectivity of 2-X is somewhat larger than that of either of the homologues. This is also true of the corresponding aza-and ...