N,N'-Diisopropyl-substituted 1,3,4-oxadiazolidine 3e, 1,3,4-t,hiadiazolidine 6, 4,5-benzo-1.2,3,6-tetrahydropyridazine 8, and new 3,4-dialkyl-l,3,4-oxadiazolidines 9--14 were synthesized and studied. The configurationa{ stability of the N atoms does not change on going from compound 3r to its S-analog 6 and decreases in the case of pyridazine 8. 3,4-Di-tertalkyl-l,3,4-oxadiazolidines 3d and 11--14 were found to be promising objects for optical resolution.
The anisotropic thermopower of was measured from T, up to 400 K * * * The authors are grateful to S. S. XIE for offering YBa&u307-,. single crystals. This work is supported by NSFC.
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