Eine neue Methode zur Synthese von Glykosiden der Phenole ¹ ).

Abstract

18 -X t h y l -p e n t a t ri a c o n t a n aus dem tertiaren C a r b i n ol durch R e d u k t i o n mit Jodwasserstoffsaure und rotem Phosphor. Destillation bei 0.5 mni Druck und 260-265O. Wird bei Zimmer-Temperatur gerade fest. Schnip. 2 0 -n o ; nach langereni Stehen im festen Zustand: 27-28O; bei sofortiger Wiederholung : 20-21".18 -P h e n y 1 -p e n t a t ri a c on t a n o 1 -(18) am S t e a r on durch Grignardierung mit einem grofien T'berschuB an P h en yl-magnesi 11 m b r o mi d. Destillation im Hochvakuum. Unikrystallisation aus Athanol. Schmp. 50-51°.

Formation of β-Phenylglucoside in Plant Leaves.

“…Synthetic phenylglucoside was obtained by the method described by Helferich and Schmitz-Hillebrecht (2). The position of phenylglucoside on the chromatograms was determined by placing the chromatogram over a calcium tungstate screen and irradiating it with ultraviolet light (2537 A maximum).…”

General Aspects of the Glycosidic Bond Formation

“…Indeed, it was noted that faster reactions often result in a decreased stereoselectivity. At around the same time, the first attempts to involve other classes of anomeric leaving groups (LGs) resulted in the investigation of peracetates as glycosyl donors [9].…”

Synthesis and Taste of Some Flavanone and Dihydrochalcone Glycosides in which Carbohydrate Moieties are Located at differing Positions of the Aglycones

“…33 ) A mixture of tetra-O-acetyl-a-L-rhamnopyranose (66 g), p-hydroxybenzaldehyde (50 g) and p-toluenesulfonic acid (1.6 g) was heated at 110°C for 30 min and then treated in the usual manner. 33) …”