Furan 2,5-dihydro-2,5-dihydroxy

Benzo[b]furan, 2,3-dihydro-2-phenyl-synthesis, 4, 697 Benzo[b]furan, 2,3-dihydroxy-tautomerism, 4, 37 Benzo[6]furan, 4,6-dimethoxy-acylation, 4, 606 Benzo[6]furan, 2,3-dimethyl-acetylation, 4, 606 bromination, 4, 605 photooxygenation, 4, 642 Benzo[b]furan, 5,6-dimethyl-2,3-diphenyl-applications, 4, 709 Benzo[b]furan, 1,3-diphenyl-vertical ionization potential, 4, 587 Benzo[b]furan, 2-ethoxy-5-hydroxy-synthesis, 4, 127... [Pg.547]

Furan, 2,3-dihydro-5-methyl-polymers, 1, 276 Furan, 2,3-dihydro-3-methylene- H NMR, 4, 577 Furan, 2,5-dihydro-2-methylene- H NMR, 4, 577 tautomerism aromaticity and, 4, 595 Furan, 2,5-dihydro-2-nitro-structure, 4, 550 Furan, 2,3-dihydroxy-tautomerism, 4, 37 Furan, 2,4-dihydroxy-tautomerism, 4, 37 Furan, 3,4-dihydroxy-tautomerism, 4, 37 Furan, 2,5-diiodo-nitration, 4, 602 synthesis, 4, 712 Furan, 3,4-diiodo-reactions, 4, 650 Furan, 2,3-dimethoxy-synthesis, 4, 625, 648 Furan, 2,5-dimethoxy-synthesis, 4, 648 Furan, 3,4-dimethoxy-cycloaddition reactions, 4, 64, 625 lithiation, 4, 651 reactions... [Pg.630]

Thermolysis of D-fructose in acid solution provides 11 and 2-(2-hydrox-yacetyl)furan (44) as major products. Earlier work had established the presence of 44 in the product mixtures obtained after acid-catalyzed dehydrations of D-glucose and sucrose. Eleven other products were identified in the D-fructose reaction-mixture, including formic acid, acetic acid, 2-furaldehyde, levulinic acid, 2-acetyl-3-hydroxyfuran (isomaltol), and 4-hydroxy-2-(hydroxymethyl)-5-methyl-3(2//)-furanone (59). Acetic acid and formic acid can be formed by an acid-catalyzed decomposition of 2-acetyl-3-hydroxyfuran, whereas levulinic acid is a degradation prod-uct of 11. 2,3-Dihydro-3,5-dihydroxy-6-methyl-4//-pyran-4-one has also been isolated after acid treatment of D-fructose.The pyranone is a dehydration product of the pyranose form of l-deoxy-D-eo f o-2,3-hexodiulose. In aqueous acid seems to be the major reaction product of the pyranone. [Pg.286]

The major products formed from hexoses that react in aqueous acidic solution are 5-(hydroxymethyl)-2-furaldehyde, levulinic acid, and polymeric materials. In addition, many minor dehydration products are found. In a study41 of D-fructose, 2-(2-hydroxyacetyl)furan (13), 2-acetyl-3-hydroxyfuran (isomaltol 16), 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one, and 3,4,5-trihydroxy-3,5-hexadien-2-one (acetylformoin) were identified. Products not formed solely by dehydration mechanisms include acetone,56 formaldehyde, acetalde-... [Pg.176]

The 2,4-dihydroxy-3,3-dimethyl-butironitrile was treated hydrochloric acid and D,L-3-hydroxy-4,4-dimethyl-dihydro-furan-2-one (D,L-pantolacton) was obtained. The racemic mixture of D- and L-pantolactons was a division of D-and L- isomers by the adding of a-phenylethylamine. So D-pantolacton was isolated. [Pg.2611]

Dihydroxy-2,5-dihydro- (3,4-disubst.) E14a/1, 451 (Furan-Oxid.)... [Pg.36]

Furan 4-Hydroxy-3-methoxycarbo-nyl-2-oxo-2,5-dihydro-Vl/ld, 50 trans-2,4-Hexadiensaure 4,5-Dihydroxy-6-oxo- Vl/ld, 279... [Pg.269]

Furan 2-[2-(bzw. 3 bzw.4)-Chlor-phenyl]-3,4-dihydroxy-5-imino-2,5-dihydro- VI/2, 698 f. Isocyanat (2-Chlor-l-phenyl-ethoxycarbonyl)- E4, 1244 (Cl —CO —NCO +- Oxiran) Quinolin 8-Chlor-4-methyl-2,5,6-trihydroxy- VI/lc, 624... [Pg.704]

Furan 3,4-Dihydroxy-5-imino-2-(3-nitro-phenyl)-2,5-dihydro- VI/2, 698 f. [Pg.709]

Amino-4-hydroxy-8-methyl- E19d, 689 (aus 1,3-Oxazol-Der.) 7-Aminoxy-4-methyl- El 6a, 264 Furan 3,4-Dihydroxy-5-imino-2-phenyl-2,5-dihydro- VI/2, 698 Glyoxylsaure (3,4-Dimethoxy-phenyl)- -nitril E13/2, 1158 (Alkohol - Keton)... [Pg.719]

Furan 3,4-Bis-[methoxycarbonyl-methyl]-2,5-dihydroxy-2,5-dihydro- E14a/1, 451 (Furan-Oxid.) a-o-Gluco-furanose 5,6-O-Carbonyl-1,2-O-isopropyliden- E4, 88/90 (H - CHO)... [Pg.779]

H-Chroraon 7-Aminoxy-4,8-di-methyl- E16a, 259 (O-Umarylier.) 1,3,4-Dioxazol 2-(2-Oxo-propyl)-5-phenyl- E14a/1, 321 (R-CO-NH-OH + En —Cl) Furan 3.4-Dihydroxy-5-imino-2-(4-met hy l-phenyl)-2,5-dihydro-VI/2, 698 f. [Pg.865]

Figure 7.1.1. Chromatogram for the pyrotysate ofgtucose obtained by on-line Py-GC/MS. The peak assignments are 1 furan, 2 2-melhylfuran, 3 2,5-dimethylfuran, 4 3-methyl-2-butanone, 5 water, 6 1-hydroxypropanone, 7 hydroxyacetaldehyde, 8 acetic acid, 9 oxopropanoic acid methyl ester, 10 furancarboxaldehyde, 11 1-(2-furanyl)-ethanone, 12 5-methyl-2-furfural, 13 2-hydroxycyclopent-2-en-1-one, 14 2-hydroxy-3-methyl-2-cyclopenten-1-one, 15 2,3-dihydro-5-hydroxy-6-methyl-4H-pyran-4-one, 16 2-methyl-1,3-benzendiol, 17 2,5-dimethyldioxane, 18 2-hydroxy-3-pentanone, 19 5-formyl-2-fufurylmethanoate, 20 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one, 21 1,4 3,6-dianhydro-a-D-glucopyranose, 22 5-(hydroxymethyl)-furancarboxaldehyde.

Analog erhalt man aus 4,6-Dihydroxy-2-isopropenyl-7-acetyl-2,3-dihydro- (benzo-[b]-furan) mit Platin(IV)-oxidunter Erhalt der Carbonyl-Gruppe 71,5% d. Th.2,4,6-Trihydroxy -3-(3 -methyl-butyl)-acetophenon 1 ... [Pg.390]

So erhalt man z.B. aus l,4-Dihydroxy-butin-(l) mit Raney-Nickel (2071 bar) 66% d.Th. eincscishrans-1,4-Dihydroxy-buten-(2)-Gemisches und 8,5% d. Th. 2,5-Dihydro-furan, das aus der rw-Komponente entstan-den ist7-10. [Pg.458]

Hydroxymethyl-2-oxo-2,5-dihydro-furan (75%) wird durch -Z-Photoisomerisierung des4,5-Dihydroxy-( )-2-pentensaure-methylesters crhaltcn184. [Pg.741]

Dihydro-5,7 -dihydroxy-10 -methoxyspiro[ 1 //-indene-1 phenanthro[2,l-/ ]furan]-2 -one, see B-30057... [Pg.437]

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