Medium heterocyclic rings from carbohydrate precursors

1968 ◽  
Vol 46 (19) ◽  
pp. 3061-3069 ◽  
Author(s):  
J. F. Stoddart ◽  
W. A. Szarek
Keyword(s):  
Acid Hydrolysis ◽  
Spectral Data ◽  
Borohydride Reduction ◽  
Methyl Derivative ◽  
Partial Acid Hydrolysis ◽  
Physical Evidence ◽  
Quantitative Measurements ◽  
Conformational Properties ◽  
Hydrolysis Of

Chemical and physical evidence is presented to show that the structure of a dianhydride of D-ribose is di-β-D-ribofuranose 1,5′:1′,5-dianhydride. Partial acid hydrolysis of this dimer affords a ribobiose, which is shown to be 5-O-β-D-ribofuranosyl-D-ribose, since examination of the O-methyl derivative of this disaccharide yields 2,3,5-tri- and 2,3-di-O-methyl-D-ribose, and since quantitative measurements of the periodate consumption of the derived glycitol (4 moles of periodate per mole) are consistent with a structure corresponding to 5-O-β-D-ribofuranosyl-D-ribitol. In addition to confirming that both the 1 → 5′- and 1′ → 5- linkages have the β configuration, n.m.r. spectral data for the dianhydride tetraacetate leads to a conformational assignment for this derivative in chloroform at room temperature.Periodate oxidation of the dianhydride, followed by borohydride reduction and acetylation, yields a 2,4,7,9-tetraacetoxymethyl-1,3,6,8-tetraoxacyclodecane. The conformational properties of this compound are discussed.

Phosphopeptides Obtained by Partial Acid Hydrolysis of α-Casein2

1957 ◽  
Vol 79 (10) ◽  
pp. 2559-2565 ◽  
Author(s):  
N. J. Hipp ◽  
M. L. Groves ◽  
T. L. McMeekin
Keyword(s):  
Acid Hydrolysis ◽  
Partial Acid Hydrolysis ◽  
Hydrolysis Of

A Stereospecific Synthesis of L-Desosamine

1974 ◽  
Vol 52 (1) ◽  
pp. 122-124 ◽  
Author(s):  
Hans H. Baer ◽  
Chung-Wai Chiu
Keyword(s):  
Acid Hydrolysis ◽  
Nitro Group ◽  
Catalytic Hydrogenation ◽  
Glycosidic Bond ◽  
Stereospecific Synthesis ◽  
Borohydride Reduction ◽  
Amino Glycoside ◽  
Hydrolysis Of

L-Desosamine (3,4,6-trideoxy-3-dimethylamino-L-xylo-hexose), the enantiomer of a widely distributed antibiotics component, was synthesized by borohydride reduction of methyl 3,4,6-trideoxy-3-nitro-α-L-erythro-hex-3-enopyranoside followed by catalytic hydrogenation of the nitro group, N,N-dimethylation of the resulting saturated amino glycoside, and acid hydrolysis of the glycosidic bond.

894. Gum ghatti (Indian gum). Part III. Neutral oligosaccharides formed on partial acid hydrolysis of the gum

1958 ◽  
pp. 4408 ◽  
Author(s):  
G. O. Aspinall ◽  
Barbara J. Auret ◽  
E. L. Hirst
Keyword(s):  
Acid Hydrolysis ◽  
Partial Acid Hydrolysis ◽  
Gum Ghatti ◽  
Hydrolysis Of

scholarly journals The products of the partial acid hydrolysis of the mucopeptide from cell walls of Micrococcus lysodeikticus

1959 ◽  
Vol 72 (4) ◽  
pp. 647-654 ◽  
Author(s):  
H R Perkins ◽  
H. J. Rogers
Keyword(s):  
Acid Hydrolysis ◽  
Cell Walls ◽  
Partial Acid Hydrolysis ◽  
Micrococcus Lysodeikticus ◽  
Hydrolysis Of

Syothesis of 3-Deoxy-3-nitro-D-xylose

1971 ◽  
Vol 49 (19) ◽  
pp. 3238-3239 ◽  
Author(s):  
Jan Kovář ◽  
Hans H. Baer
Keyword(s):  
Acid Hydrolysis ◽  
Title Compound ◽  
Periodate Oxidation ◽  
Borohydride Reduction ◽  
Hydrolysis Of

Crystalline 3-deoxy-3-nitro-α-D-xylose (5) was obtained in 40% over-all yield by periodate oxidation of 3-deoxy-1,2-O-isopropylidene-3-nitro-α-D-glucofuranose (2) followed by borohydride reduction and acid hydrolysis. In addition to the intermediate 3-deoxy-1,2-O-isopropylidene-3-nitro-α-D-xylofuranose (4), a small amount of an isomer probably having the D-ribo configuration was isolated. The title compound (5) was also obtained by hydrolysis of its methyl β-pyranoside (1).

scholarly journals A study of the acidic peptides formed on the partial acid hydrolysis of wool

1949 ◽  
Vol 44 (5) ◽  
pp. 548-560 ◽  
Author(s):  
R. Consden ◽  
A. H. Gordon ◽  
A. J. P. Martin
Keyword(s):  
Acid Hydrolysis ◽  
Partial Acid Hydrolysis ◽  
Acidic Peptides ◽  
Hydrolysis Of

Complexes of Nickel(II) and Copper(II) With 5,5,7-Trimethyl-1,4-Diazepane. Preparation and Kinetics of Acid-Hydrolysis

1986 ◽  
Vol 39 (2) ◽  
pp. 239 ◽  
Author(s):  
NF Curtis
Keyword(s):  
Acid Hydrolysis ◽  
Acid Concentration ◽  
Reaction Rates ◽  
Borohydride Reduction ◽  
Kinetics Of Hydrolysis ◽  
Rapid Reaction ◽  
Kinetics Of ◽  
Hydrolysis Of

The cyclic diamine 5,5,7-trimethyl-1,4-diazepane, tmdz, is formed by borohydride reduction of 5,7,7-trimethyl-2,3,6,7-tetrahydro-1H-1,4- diazepine , which is formed by a rapid reaction between ethanediamine and 4-methylpent-3-en-2-one. Salts of the cations [Ni( tmdz )2]2+ and [Cu( tmdz )2]2+ were prepared, and their properties are reported. The kinetics of hydrolysis of [Ni( tmdz )2]2+ and [Cu( tmdz )2]2+ and bis (1,4- diazepane )nickel(II), [Ni( dach )2]2+, in aqueous HCl/NaCl media have been studied. Reaction rates are independent of acid concentration over the ranges used . Ni2+,0.1-1 mol l-1 H+ in 1 mol l-1 Cl -, kobs(25°C) = 9.1(1)×10-7 s-1, kobs(50°C) = 2.0(1)×10-5 s-1,ΔH‡96(2)kJ mol-1,0.08-4 mol l-1, H+ in 4 mol l-1 Cl -, kobs (25°pC) = 2.0(3)°10-7 s-1. Cu2+, 0.04-1 mol l-1 H+, 1 mol l-1 Cl -, kobs (25°C) = 0.028(2) s-1, for the displacement of the second ligand . [Ni( dach )2]2+, 0.1-1 mol l-1 H+, 1 mol l-1 Cl -, kobs (25°C) = 0.051(2) s-1. [Ni( tmdz )2]2+ reacts more rapidly with NaOH/edta : 1 mol l-1 NaOH , 0.1 mol l-1, Na2(edtaH2), kobs (25°C) = 7.3(3)×10-3 s-1, 0.5 mol l-1 NaOH , 0.1 mol l-1 Na2(edtaH2), kobs (25°C) = 4.5(3)×10-3 s-1.

scholarly journals A study of the partial acid hydrolysis of some proteins, with special reference to the mode of linkage of the basic amino-acids

1941 ◽  
Vol 35 (12) ◽  
pp. 1369-1387 ◽  
Author(s):  
A. H. Gordon ◽  
A. J. P. Martin ◽  
R. L. M. Synge
Keyword(s):  
Amino Acids ◽  
Special Reference ◽  
Acid Hydrolysis ◽  
Partial Acid Hydrolysis ◽  
Basic Amino Acids ◽  
Hydrolysis Of
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