Infrared absorption spectra of some cyclic acetals of sugars

Abstract

The infr ared absorption spcctra of t wenty-eigh t I-methoxycth y lidene and isopropylidene acetals of sugars have been record ed and analyzed. The formulas of t he compounds were gro uped according to structure, a nd t he absorp tion bands for each group were considered in relation to t h e bands found for t he other stru cturally related compounds. No bands were found for t he unequivocal d etection of t he 1,3-c1ioxola ne r ing attached respectiv ely to an aldopentofuranose or a ketopentofuranose, an aldopentopyranose, an wld ohexofuranose, an aldohexopyranose or a ketohexopyranose, a Ul'onic a cid salt or lactone, a sugar :,lcohol, or a sugar keto-acid salt. R egardless of t he fin e structure of t he dioxolane compounds, certain strong band s were observed, but t he bands a re not. easily recognized from an inspection of one or t wo spectra and a re not characteristic of t hese compound only. ' Sample from the P . A . L C"cne _ ' iemorial C o llection at t he R ockefeller Institute for M edical R esearch, til rough th e courtesy of D r. L y man O. Craig. r 'rllis compound shonld be cap able of cxisten ce in anomeric forms . g Kucleating crystals used were from a sample (sce footnote e) prepa red Ily one of us (R .S.' l'.) in 1935. h Structure uncertain. ; Tri vial