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Furan derivatives sucrose

Furan Derivatives Catalytic processes used to obtain furan derivatives from carbohydrates and the catalytic routes from furan intermediates to chemicals and polymers have been reviewed by Moreau et al. [27]. Some of the main reactions are summarized in Fig. 3.2. From fructose or carbohydrates based on fructose (sucrose, inulin), the first transformation step is dehydration to 5-hydroxy methylfur-fural (HMF). Fructose dehydration at 165 °C was performed in the presence of... [Pg.61]

Among the important processes taking place when sucrose is heated is cara-melization. Caramel is actually a very complex mixture. Some constituents are volatile, such as furan derivatives, pyrones, aldehydes, and low molecular weight carboxylic acids, and these account for 10% of the mass.340 The main constituents of the nonvolatile component have also been identified these include... [Pg.257]

Reaction of such compounds as ethyl acetoacetate or 2,4-pentanedione with D-fructose gives /3-substituted furan derivatives this is in contrast with the a-substituted compounds obtained from aldoses. The mechanism of reaction is identical in both cases, and the structure has been proved by degradation methods and by infrared and ultraviolet spectroscopy. With sucrose as the starting material, a mixture of a- and /8-substituted compounds was obtained in the ratio of 65 35. [Pg.288]

As furan derivatives, both furfural and 5-hydroxymethylfurfural (HMF) are readily prepared from renewable biomass. Furfural can be easily obtained from a variety of biomass containing pentoses, mainly including com cobs, oats and rice hulls, sugar cane bagasses, cotton seeds, ohve husks and stones, and wood chips. Furfuryl was first produced in the early nineteenth century and right now the annual production is 300,000 tons [101]. On the other hand, HMF is another major promising furan derivative due to its rich chemistry and potential availability from hexose carbohydrates or from their precursors such as fructose, glucose, sucrose, cellulose, and inulin [14]. [Pg.195]

Under the conditions corresponding to the roasting of coffee, serine, threonine, and sucrose yield various substituted pyridines (51), furans, and furanones (52). Thirty-three pyridine derivatives were identified by Baltes and co-workers (51), Recently, 3-methylthiomethylpyridine was identified as one of the products of thermal degradation of the glucose-methionine Amadori intermediates (53). [Pg.47]

Haworth WN, Jones WGM (1944) The conversion of sucrose into furan compounds. Part 1. 5-Hydroxymethylfurfuraldehyde and some derivatives. J Chem Soc 667-670... [Pg.79]

Furanose Five-membered ring (derived from furan) with a single oxygen formed by reaction of the carbonyl carbon of an aldose or ketose with the appropriate hydroxyl group. Sugars commonly found as furanoses include ribose and 2-deoxyribose (in RNA and DNA, respectively), and fructose in combined form (sucrose, for example). [Pg.49]


See other pages where Furan derivatives sucrose is mentioned: [Pg.450]    [Pg.557]    [Pg.306]    [Pg.89]    [Pg.1016]    [Pg.276]    [Pg.212]    [Pg.259]    [Pg.111]    [Pg.400]    [Pg.401]    [Pg.146]    [Pg.15]    [Pg.28]    [Pg.555]    [Pg.14]    [Pg.919]    [Pg.118]   
See also in sourсe #XX -- [ Pg.84 ]




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