1,6-Anhydro glucopyranose

The reaction to form an acetal can be an iatramolecular reaction. The best known example is 1,6-anhydro-P-D-glucopyranose [498-07-7] commonly called levoglucosan. [Pg.478]

Conversion of l,6-anhydro-4-0-benzyl-2 deoxy 2-fluoro-p-D-glucopyranose to the corresponding oxo derivative is earned out by ruthenium tetroxide generated in situ from ruthenium dioxide [54] (equation 49)... [Pg.336]

In addition to the above mentioned 4J couplings, we have now observed several examples of couplings across five bonds—i.e. 5J. For example, the ribopyranose derivative (13) shows a coupling of ca. 0.1 Hz between Hx and H4. Further examples occur in the spectrum of 2,3,4-tri-0-acetyl-l,6-anhydro-/ -D-glucopyranose (12), where Ji,4 = ca. 0.1 Hz and J2,5 = 0.5 Hz. Whether it is significant that these couplings all occur between equatorially oriented protons must await further studies. [Pg.253]

Methyl 2,6-anhydro-a-D-altropyranoside-2 5B g l,4-Anhydro-ot-D-allopyranose-Bi,4 9 1,2-0-Ethylidene-a-D-glucopyranose- S3 10 p-L-Altropyranose-2So... [Pg.71]

Anhydro-p-D-glucopyranose 2,7-Anhydro-P-D-a/fro-hept-2-ulopyranose not 1,5-anhydro-a-D-glucoseptanose (older trivial name sedoheptulosan)... [Pg.119]

Tri-0-acetyl-1,2-anhydro-a-D-glucopyranose not 3,4,6-tri-O-acetyM, 5-anhydro-p-D-glucooxirose... [Pg.119]

An alternative synthesis,by method h, was conducted by coupling 357 and 1,6-anhydro-4-0-(3,4-anhydro-6-deoxy-a-D-galactopyranosyl)-a-D-glucopyranose (392a) in 2-propanol at 120° this yielded a diastereoiso-meric mixture, from which, after the usual treatment, amylostatin (XG) was isolated in 20% yield. [Pg.82]

Trideoxy-2,3,4-trifluoro-D-galacto- and -gluco-pyranosyl derivatives 391 and 392 have been prepared from l,6-anhydro-4-(9-benzyl-2-deoxy-2-fluoro-/ -D-glucopyranose (385) by use of DAST, through several intermediates, as shown [385 386,10% 387- 388,72% 389 390,90% refl. toluene (for 385) or dichloromethane (for 387 and 389), 24 h]. [Pg.150]

Spin-Lattice Relaxation Rates (in s ) of 23,4,6,2 3 -Hexa-O-acetyl-l,6-anhydro-4-O-0-D-glucopyranosyl-/ -D-glucopyranose (3)° and... [Pg.155]

Interproton Distances (A) for 2, 4,6>2 >3 -Hexa-0-acetyl-l,6-anhydro-4-0- -glucopyranosyI- 8-D-glucopyranose (3)... [Pg.156]

Interproton distances of 0-ceIIobiose (see Ref. 49) error 0.01 A. Interproton distances of 1,6-anhydro- -D-glucopyranose (see Ref. 49) error 0.01 A. Interproton distances of -cellobiose octaacetate (see Ref. 49) error 0.05 A. Interproton distances of 2,3,4-tri-0-acetyl-l,6-anhydro- -D-glucopyranose (see Ref. 49) error 0.05 A. Error calculations based on the errors of the measured quantities in Eqs. 18 and 21. Interproton distances calculated from the relaxation parameters of the methylene protons. [Pg.156]

Support for this result was obtained from the taste of 1,5-anhydrohexitols, which, only for purposes of comparison, can be regarded as 1-deoxyal-dopyranoses. 1,5-Anhydro-D-glucitol (that is, the incorrectly named 1-deoxy-D-glucopyranose ) (14), 1,5-anhydro-D-mannitol ( 1-deoxy-D-mannopyranose or 2-deoxy-D-fructopyranose ) (15), and 1,5-anhydro-D-galactitol ( l-deoxy-o-galactopyranose ) (16) are all purely sweet, without any trace of bitterness. Furthermore, the complete absence of bitterness of 1,5-anhydromannitol (16) clearly indicates that the anomeric... [Pg.240]

Fourteen DFAs and some oligomers were identified in caramel obtained by thermal treatment of inufin. - Monosaccharides (glucose, fructose), dehydration products (1,6-anhydro-p-D-glucopyranose, 1,6-anhydro-p-D-glucofuranose), disaccharides (gentiobiose and isomaltose), and oligosaccharides were also found in glucose and sucrose caramel. ... [Pg.338]

Ana,6s (2 AM6S (where I = a-L-iduronic acid, ANA6S = 2-acetamido-2-deoxy-a-D-glucopyranose 6-sulfate, G = / -D-glucuronic acid, and AMes = 2,5-anhydro-D-mannitol 6-sulfate, the last arising from 2-deoxy-... [Pg.76]

CgHuNgOs l,6-Anhydro-2,4-diazido-2,4-dideoxy-/ -D-glucopyranose ZDGPLN 43 209... [Pg.378]

CgHioC S 1,6-Anhydro-1 (6)-thio-/ -D-glucopyranose [ 1 (6)-thiolevo- TLEVGL 38 423... [Pg.380]

CgHuN04 3-Amino-l,6-anhydro-3-deoxy-/S-D-glucopyranose AHXGLP 38 424... [Pg.380]

Ci2H16Os 2,3,4-Tri-O-acety 1-1,6-anhydro-/ -D-glucopyranose (levoglu-cosan triacetate) LEVGTA 32 364... [Pg.389]

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