Methods in Carbohydrate Chemistry (5 Bände). Bd. II: Reactions of Carbohydrates, herausgeg. von R. L. Whistler und M. L. Wolfrom. 1. Aufl., XV, 572 S., geb. ca. DM 78.50. Bd. III: Cellulose, herausgeg. von R. L. Whistler. 1. Aufl., XVI, 407 S., geb. ca. DM 63.50. Academic Press, Inc., New York‐London 1963

Abstract

Leit von ( 3 ) folgt. da13 die Carboxamido-Gruppe dcs Asparaginanteiles im Gegensatz zum Glutamin-Anteil fur die biologische Aktivitit des Oxytocins unbedingt erforderlich ist. / J. biol. Chemistry 238, 1560 (1963) / -De.[Rd 6671Sulfoniumsalze rnit Alkyl-und 2-Halogenathyl-Liganden H urden in Analogie zu den schon bekannten Tri-(2-halogenithyl)und Di-(2-halogenathyl)-vinyl-sulfoniumsalzen ( l a ) und ( I b ) von A. Liirtringhaus und H. Muchatzke hergestellt und auf

Epimerization of Monosaccharides Under Acetolysis Conditions

“…The syrupy acetate (100 mg) has then treated with a mixture of acetic anhydride (1 nil), acetic acid (0.5 mi), and sulfuric acid (0.02 ml) for 43 h. After work-up in the usual manner there was obtained 1,2,3,4,6-penta-0-acetyl-r-D- 2 in chloroform), was prepared by condensation of acetone with D-glj~cero-D-gulo-heptose as described by Brimacombe and Tucker (11) except that the sulfuric acid catalyst was replaced by zinc chloride -phosphoric acid (29) and in column chromatography ether was used in place of acetonetoluene. With zinc chloride -phosphoric acid instead of sulfuric acid as acetalation catalyst, the heptose appeared to dissolve.and react more readily with less formation of acetone condensation by-products.…”