... Volume: Page: ... 4- and 6-analogues in (i) their polarity, as manifested by TLC, where the former are remarkably less polar than the latter; and (ii) behavior of ... 4b) were isolated in about a 1:4.5 ratio when either 2b or 2c 5 was subjected to NaCNBH 3 /(CH 2 O) n in ...