9-O-acetyl

Candida cylindracea, phosphate buffer pH 7, Bu20. The 6-O-acetyl of O -methylperacetylglucose was selectively removed. Porcine pancreatic lipase also hydrolyzes acetyl groups from other carbohydrates. These lipases are not specific for acetate, since they hydrolyze other esters as well. In general, selectivity is dependent upon the ester and the sub-... 

Methoxycoumaroyl 5-methyl-7-hydroxy 2-acetonyl DI-C-GLYCOSYLFLAVONES Vicenin-1 ( ) 6"-O-Acetyl 6- C-a-L-Rhamnosylapigenin ( ) 8-C-(6" -3-Hydroxy-3-methylglutaroyl)glucoside Isoschaftoside 2" -0-Feruloyl... 

Vaccinium bracteatum Thunb. V. vitis-idaea L. Wu Fan Shu (Mountain cranberry) (leaf) 6-o-acetyl-arbutin, arbutin, avicularin, 2-o-caffeoylarbutin, d-catechol, 1-epicatechol, d-gallocatechol, hyperin, hyperoside, sioquercitrin, salidroside, tannins, ursone.50 For gonorrhea. 

C-galactopyranosyl-isoscutellarein 6-ethoxy-chelerythrin 6-isoinosine 6-methylocodine 6-O-P-sophoruside 6-O-acetyl-arbutin... 

Following the work of Mclnnes,289,290 methanolysis in the presence of potassium carbonate was used to prepare methyl 6-O-acetyl- and methyl 6-0-octadecanoyl-/3-D-glucopyranoside,291 o-nitrophenyl /3-D-galactopyranoside 6-phosphate,292 methyl 5-thio-a-D-glucopyranoside 6-phosphate,293 and 6,6 -di-0-hexadecanoyl-a,a-trehalose,294 from the appropriate, per-0-(trialkylsilyl)ated precursors. 

Ultraviolet irradiation43 of a methanolic solution of compound 3 in the presence of alkali led to its rapid, almost quantitative, conversion into l,2 3,4-di-0-isopropylidene-a-D-fucopyranose (5) an excellent yield of 5 was also obtained44 by irradiation of a solution of 6-O-acetyl-l,2 3,4-di-0-isopropylidene-a-D-galactopyranose (6) in aqueous hexa-methylphosphoric triamide. 

O-acetyl-a-D-mannopyranosyl unit. About half of the terminal P-D-mannopyranosyl units carry a pyruvic acid group as a 4,6-di-O-acetal. The molecular weight is probably on the order of 2 x 106 daltons, although much higher figures have been reported. 

By treating 2,3,4,6-tetra-O-acetyl-a-D-glucosyl chloride in ether solution with silver nitrate (Schlubach, Stadtler, Wolf [19]) 2,3,4,6-O-acetyl-a-D-glucosyl nitrate was obtained. 

O-Acetyl-N-acetylmannosamine 6, prepared from Af-acetylmannosamine either by chemical acetylation [28] or by transesterification catalyzed by subtilisin [31], led to 9-0-acetyl Neu5Ac 7 [29], a receptor of influenza C virus occurring on human erythrocytes. Several other 9-O-substituted Neu5Ac derivatives could also be prepared [29-32]. 

P2, Z = 2 Dx = 1.34 R = 0.046 for 1,870 intensities. The pyranose conformation is Ct, with four axial acetoxyl groups. The 0-0 separations between the two pairs of syn-diaxial, acetoxyl oxygen atoms are 287 and 288 pm these do not cause major distortions in the ring, which has torsion angles of 41 to 59°. The 6-O-acetyl group is trans /gauche. 

Having confirmed that the immobilization strategy was robust enough to be used in conjunction with a continuous flow reactor, the authors evaluated the immobilization of a second Hisg-tag enzyme, BsubpNBE, and employed the synthesis of 6-O-acetyl-D-glucal 162 (Scheme 44) as a model reaction. 

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