Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Mannitol chemistry

Its acidity is considerably enhanced by chelation with polyhydric alcohols (e.g. glycerol, mannitol) and this forms the basis of its use in analytical chemistry e.g. with mannitol p T drops to 5.15,... [Pg.203]

The rate law of Eq. (15) holds at all pHs, despite the fact that is strongly pH dependent (see below). Free radical oxidation chemistry (60) appears not to be involved in these Fem-TAML catalyzed oxidations to any detectable degree. The efficient hydroxyl radical scavenger, mannitol (61,62), when added over the concentration range (0.5-2.0) x 10 3 M has no effect on the rate. This peroxide oxidation catalyzed by 1 does not proceed extensively via the hydroxyl free radical serving as the reactive intermediate. [Pg.498]

The chemistry of mannitol and sorbitol has been studied with a view to finding further uses for these alcohols and in this connection might be mentioned an attempt, though unsuccessful, to make a polyamide intermediate from mannitol. Mannitol was converted through the... [Pg.302]

Irvine s first publication (1899) dealt with the rotatory powers of the optically active methoxy- and ethoxy-propionic acids prepared from lactic acid. In those early days the Purdie reaction afforded so rich a field for investigation that Irvine and his collaborators continued work on various types of hydroxy bodies in addition to the sugars. There appeared papers on the isopropylidene derivatives and methyl ethers of glycerol and mannitol, and on the chemistry of benzoin and benzoin-like materials. The constitution of the glucoside salicin was studied and its pentamethyl ether was synthesized. [Pg.427]

Unsaturated 1,1-dioxo derivatives 30 were accessed in c. 60% yields via cyclization of mannitol derivatives 29 with sulfamide in pyridine <1997JME885, 1999JME4054, 2001JME155, 2002OL4673>. As a part of a medicinal chemistry approach to HIV-1 protease inhibitors, the resulting products 30 were further alkylated with benzyl bromide in >90% yields (Scheme 3). [Pg.392]

The strain Rhizobium EQ1 was used. This strain was isolated from culture of the beans variety "Caupi" from an arid region of the northeast of Brazil. This strain was kept in agar-mannitol-yeast extract (YMA) for several months, and, after its characterization was cataloged, at the culture bank of the School of Chemistry from Federal University of Rio de Janeiro, under the code EQ1. [Pg.640]

Thermodynamic control is important in other ways in carbohydrate chemistry, because control over ring size allows selective protection of the hydroxyl groups of sugars. Compare these two reactions. Both of them give acetals from the same starting material, mannitol. [Pg.1137]

In the history of the Chemistry Department of St. Andrews, there was one woman who made an indelible imprint — Ettie Stewart Steele.20 Steele obtained an M.A. followed by a B.Sc. in 1914, and then commenced research with Irvine on the structure of mannitol.21 Appointed as University Assistant in 1919, she received a Ph.D. in 1920 for her research work, following which she was promoted to Lecturer and Assistant in 1921, and to Lecturer in 1924. Steele contributed to five research papers on carbohydrates, including one under her name alone. [Pg.268]

Wrodnigg, T M, From lianas to glycohiology tools twenty-five years of 2,5-dideoxy-2,5-imino-D-mannitol. In Timely Research Perspectives in Carbohydrate Chemistry, Schmid, W and Stiitz, A E, Eds., Springer, Vienna, pp. 41-76, 2002. [Pg.439]

We have already discussed the widespread sugar alcohols such as mannitol but more Important compounds are cyclic sugar alcohols having a carbocycllc ring (cyclitols). The most important is inositol which controls many aspects of our chemistry that require communication between the inside and the outside of a cell. Inositol-1,4,5-ttiphosphate (IP3) can open calcium channels in cell membranes to allow calcium ions to escape from the cell. [Pg.1369]

USE Used with boric acid in the manuf of dry electrolytic condensers for radio applications in making artificial resins and plasticizers in pharmacy as excipient and diluent for solids and liqs in analytical chemistry for boron determinations in the manuf of mannitol hexanitrate. Used in the food industry as anticaking and free f]ow agent flavoring agent, Lubricant and release agent, stabilizer and thickener and nutritive sweetener,... [Pg.901]

The last phases of B. R. Baker s work that was completely devoted to carbohydrate chemistry were carried out between 1963 and 1966, when he was in residence at the State University of New York at Buffalo. He studied Sn2 displacements in comparison with neighboring-group displacements in the l,2 5,6-di-0-isopropylidene-n-mannitol and related systems, and showed that the competition between the two types of replacement reaction depends on the nucleophilic nature of the substituent group and the nature of the neighboring group and he used... [Pg.7]


See other pages where Mannitol chemistry is mentioned: [Pg.128]    [Pg.211]    [Pg.157]    [Pg.172]    [Pg.4]    [Pg.172]    [Pg.95]    [Pg.974]    [Pg.334]    [Pg.43]    [Pg.17]    [Pg.332]    [Pg.368]    [Pg.300]    [Pg.209]    [Pg.878]    [Pg.5]    [Pg.442]    [Pg.68]    [Pg.974]    [Pg.9]    [Pg.194]    [Pg.51]    [Pg.141]    [Pg.363]    [Pg.3]    [Pg.126]    [Pg.26]    [Pg.400]    [Pg.153]    [Pg.7119]   
See also in sourсe #XX -- [ Pg.481 ]




SEARCH



Mannitol

© 2024 chempedia.info