Acetals maltose

In more detail the nutrient medium used may contain sources of carbon such as starch, hydrolyzed starch, sugars such as lactose, maltose, dextrose, sucrose, or sugar sources such as molasses alcohols, such as glycerol and mannitol organic acids, such as citric acid and acetic acid and various natural products which may contain other nutrient materials in addition to carbonaceous substances. 

Initially, attempts to grow the organism on sodium acetate as the sole source of carbon were unsuccessful, but the difficulties were overcome and mannitol, arabinitol, erythritol, glycerol, maltose, and a,a-trehalose were produced. This was a useful development because conditions were established for the incorporation of [14C] acetate, thereby making labeled polyols and disaccharides available. 

Maltose (hydrated). Maltose (anliydrous) 165 loot + 130 206 Octa-acetate, a- 125, p 160... 

Configurational dependence of lJc-, c-v> values has been observed with acetates of [l -13C]-labelled cellobiose, laminarabiose, maltose, and nigerose, the a- and /3-linked disaccharides respectively giving29 the values of 46.5 and 49.2 Hz. 

Maltose, sodium chloride, magnesium chloride, potassium dihydrogenphosphate, sodium acetate ... 

Acetates and benzoates are widely used as characteristic derivatives of carbohydrates, and for the assay and protection of hydroxyl groups. Various maltose heptaacetates having a free hydroxyl group on C-l, C-2, C-3, C-6, or C-6 have been synthesized. 2,3,6,2, 3, 4, 6 -Hepta-0-acetyl-/3-maltose (17) has been prepared by hydrolysis of the corresponding glycosyl halide.57,58 The reaction conditions may not always result in the isolation of the anomerically unsubstituted acetate, as was shown by Corbett and coworkers,59 who obtained three... 

On treatment with aqueous potassium hydroxide for 40 h on a steam bath,32 phenyl /3-maltose heptaacetate (40) was converted into the 1,6-anhydride 41, isolated in 72% yield as its acetate (42). Compound 42... 

The cyclic acetals of sugars constitute an important class of compounds, and their value as synthetic intermediates is well recognized.100 The reaction of methyl /3-maltoside with benzaldehyde in the presence of zinc chloride has been reported to give the crystalline methyl 4, 6 -0-benzylidene-/3-maltoside.52 Similar benzylidenation of l,6-anhydro-/8-maltose affords the corresponding 4, 6 -0-benzylidene derivative in 63% yield.82... 

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