Unsubstituted 2,6-Dihetero-adamantanes

Unsubstituted 2,6-Dihetero-adamantanes. In C-unsubstituted 2,6-dihetero-adamantanes G I) the four equivalent methylene groups H2 —C(4), H2—C(8), H2-C(9) and H2-C(10) exhibit a single signal if X(2) = Y(6) but an AB-system 

H-C(IO) ] all appear at higher field than the ones orientated towards X(2) = 

6-aza-adamantanes, which show an almost constant value of —0.50 to —0.52 ppm for A5y(6)- 

For better comparisons of the data the normal notation 0(2), S(6) has been changed to S(2), 0(6). 

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