Conformations of the pyranoid sugars.II. Infrared absorption spectra of some aldopyranosides

The co nform ation s of t wen ty-four aldopyranos id es h a ve been st udi ed by a nal ys is of t he ij infra red absorpt ion spectra. The m ost stable co nform ations of t wel ve of t he glycos id es h ad p reviollsly been assig ned by R ee ves from a st ud y of t heir in stabilit y fa ctors; these conformations wer e aSS lim ed t o apply t o t he cr ystalline state, for whi ch t h e s pec tra h a d bee n recorded . The compounds were classifi ed in to (a) co nfi gurationally an d (b) structurally r elated .gro ups, a nd. t he spectra were in tercompared . The an alys is r evealed grou ps of absor pt lOll ba nds whi ch sh owed a co ncerted shift on chan ge of a nomeri c di spos it ion.