La. Paquette et al., Resolution and absolute configurational assignments to 1-oxa- and 1-thia-6-ketospiro[4.4]nonanyl platforms, HETEROCYCLE, 54(1), 2001, pp. 49-53
A convenient chiral sulfoxide mediated protocol for resolving the heterocyc
lic spiro[4.4]nonanes (3, 7, and 10) is described, along with crystallograp
hic substantiation of their absolute configuration.