MM3(96) CONFORMATIONAL ANALYSIS OF d-GLUCARAMIDE AND X-RAY CRYSTAL STRUCTURES OF THREE d-GLUCARIC ACID DERIVATIVES—MODELS FOR SYNTHETIC POLY(ALKYLENE d-GLUCARAMIDES)
摘要:
An exhaustive conformational analysis Of D-glucaramide was carried out using MM3(96) [MM3(96). Molecular Mechanics Software used with permission from N.L. Allinger; University of Georgia]. Nine torsion angles were each driven in increments of 120degrees, generating 19,683 starting conformations. Each conformation was then fully energy-minimized using MM3's block diagonal/full matrix optimization option at dielectric constants of both 3.5 and 6.5. Conformer populations were calculated based on the modeling results and calculated theoretical average H-1 vicinal coupling constants were compared to experimental values obtained in D2O solution. Crystal structures of three acyclic D-glucaric acid derivatives (N,N'-dimethyl-D-glucaramide, dipotassium D-glucarate, and sodium potassium D-glucarate) are reported. These structures and that of previously reported monopotassiurn olucarate correspond closely with model conformations that were within one kcal/mol of the global minimum.
Efficient Catalysts for the Green Synthesis of Adipic Acid from Biomass
作者:Weiping Deng、Longfei Yan、Binju Wang、Qihui Zhang、Haiyan Song、Shanshan Wang、Qinghong Zhang、Ye Wang
DOI:10.1002/anie.202013843
日期:2021.2.23
adipic acid from renewable biomass is a very attractive goal of sustainable chemistry. Herein, we report efficientcatalysts for a two‐step transformation of cellulose‐derived glucose into adipic acid via glucaric acid. Carbon nanotube‐supported platinum nanoparticles are found to work efficiently for the oxidation of glucose to glucaric acid. An activated carbon‐supported bifunctional catalyst composed
Zinner; Fischer, Chemische Berichte, 1956, vol. 89, p. 1503,1506
作者:Zinner、Fischer
DOI:——
日期:——
Saccharolactone Methyl Ester
作者:Richard E. Reeves
DOI:10.1021/ja01872a036
日期:1939.3
Hydroxylated nylons based on unprotected esterified D-glucaric acid by simple condensation reactions
作者:D. E. Kiely、L. Chen、T. H. Lin
DOI:10.1021/ja00081a018
日期:1994.1
Convenient procedures are described for the preparation of hydroxylated nylons (polyhydroxypolyamides) from D-glucaric acid. The procedures, which do not require protection/deprotection of carbohydrate hydroxyl groups, can be used to make a variety of polymers with a range of properties from D-glucaric acid. Simple alcohol (e.g. methanol or ethanol) esterification mixtures of D-glucaric acid (from oxidation of D-glucose) were reacted with bis-primary diamines in a polar solvent, typically methanol, to produce the polyamides. D-Glucaric acid esterification mixtures contain varying amounts of dialkyl D-glucarate, alkyl D-glucarate 1,4-lactone, and alkyl D-glucarate 6,3-lactone. These ester forms of D-glucaric acid are also in equilibrium under the conditions of the polymerization. Diamines employed included linear alkylenediamines, a branched alkylenediamine, arylalkylenediamines, and diamines with oxygen or nitrogen atoms in the alkylene chain. Considerable differences in polymer physical properties were observed by changing the diamine monomer. Linear aliphatic and arylalkylenediamines gave crystalline solid polyamides with high melting points. The C2 and C4 diamine copolymers were water soluble, whereas the C6 and above were water insoluble. The branched diamine copolymer and those with oxygen or nitrogen in the diamine chain had lower melting points and higher alcohol solubility than the unbranched alkylenediamine copolymers.
Chen, Liang; Kiely, Donald E., Journal of Carbohydrate Chemistry, 1994, vol. 13, # 4, p. 585 - 602