Hk. Fun et al., 2,3-DIDEOXY-D-ERYTHRO-HEX-2-ENONO-1,5-LACTONE AND 1,4-LACTONE OBTAINED FROM TRI-O-ACETYL-D-GLUCAL, Acta crystallographica. Section C, Crystal structure communications, 51, 1995, pp. 1330-1333
In the 1,5-lactone compound, C6H8O4, the lactone ring adopts a conform
ation between sofa and half-chair. The five-membered ring in the 1,4-l
actone, C6H8O4, is planar and the side chain is in a staggered conform
ation. The crystal structure of the 1,5-lactone is stabilized by both
O-H ... O and C-H ... O hydrogen bonds and that of the 1,4-lactone by
O-H ... O hydrogen bonds.