DERIVATIVES OF d-GALACTURONIC ACID

Derivatives of D-Galacturonic Acid-1-Phosphate

“…129°and a rotation of +239°(c, 1.0 in chloroform). An x-ray powder pattern of this bromide was also identical with the x-ray powder pattern of the bromide described by Morell, et al (13).…”

“…128°, and rotation +241°(c, 1.0 in chloroform). These properties as well as an x-ray powder pattern show that this bromide is identical with the bromide obtained by acetylating methyl tetraacetyl-a-D-galaeturonate according to Morell, et al (13).…”

“…To overcome this uncertainty we attempted to prepare the /3-isomer of the bromide (IV). Bromination of either II or III (or a mixture of these) by different methods resulted in the isolation of a bromide whose properties agree well with those of the bromide obtained by the previous workers (13). All attempts to isolate the "/3-isomer" from these reactions failed.…”

“…When 1.2 g. of III was brominated with hydrogen bromide in acetic anhydride by the procedure described by Morell, et al (13) for the bromination of methyl tetraacetyl-a-Dgalacturonate there was obtained 0.72 g. of bromide (yield 57%) with m.p. 129°and a rotation of +239°(c, 1.0 in chloroform).…”

“…D-galacturonate (IV). This bromide appears to have been prepared by Morell, et al (13); however, since no report of the /3-isomer of (IV) could be found, a definitive a-or /3-assignment to this bromide was impossible. To overcome this uncertainty we attempted to prepare the /3-isomer of the bromide (IV).…”