Study on the Synthesis and Compounding Performance of C 21 Dibasic Acid Potassium

2020 ◽  
Author(s):  
Hujun Xu ◽  
Ying Li ◽  
Liangliang Lin ◽  
Jie Shen ◽  
Xiuying Chen
Keyword(s):  
Dibasic Acid

scholarly journals pH-controlled hydrogen-bonding (Short Communication)

1974 ◽  
Vol 143 (3) ◽  
pp. 775-777 ◽  
Author(s):  
John L. Wood
Keyword(s):  
Hydrogen Bonding ◽  
Dissociation Constant ◽  
Small Proportion ◽  
Association Constant ◽  
Short Communication ◽  
Dibasic Acid ◽  
Ph Dependence ◽  
Ph Values ◽  
Conjugate Acid ◽  
Total Base

The pH-dependence of the degree of hydrogen-bonding between a base and its conjugate acid is considered. When only a small proportion of the total base is complexed, the amount complexed is proportional to (1+coshp)−1 where p=2.303 (pKa–pH), pKa being the dissociation constant of the conjugate acid. This represents sharp pH-dependence. As the proportion complexed increases, the curve broadens, eventually becoming flat-topped, with more than half the base complexed over the range of pH values pKa±logKC, approximately. (K is the complex association constant and C is the formal base concentration, including all forms.) There are similarities to the extent of mono-protonation of a dibasic acid.

Reaction of β-aminocrotonamide with dibasic acid derivatives

1983 ◽  
Vol 20 (1) ◽  
pp. 87-91 ◽  
Author(s):  
Masayuki Sato ◽  
Hiromichi Ogasawara ◽  
Tetsuzo Kato
Keyword(s):  
Dibasic Acid

THE CRYSTAL STRUCTURE OF THE ALIPHATIC DIBASIC ACID C4H4O6•2H2O

1955 ◽  
Vol 33 (9) ◽  
pp. 1450-1451 ◽  
Author(s):  
M. P. Gupta
Keyword(s):  
Crystal Structure ◽  
Dibasic Acid

not available

ChemInform Abstract: REACTION OF β-AMINOCROTONAMIDE WITH DIBASIC ACID DERIVATIVES

1983 ◽  
Vol 14 (36) ◽  
Author(s):  
M. SATO ◽  
H. OGASAWARA ◽  
T. KATO
Keyword(s):  
Dibasic Acid

PRODUCTION AND PROPERTIES OF 2,3-BUTANEDIOL XXXVI. LINEAR POLYESTERS OF 2,3-BUTANEDIOL

1950 ◽  
Vol 28b (10) ◽  
pp. 652-659 ◽  
Author(s):  
R. W. Watson ◽  
N. H. Grace ◽  
J. L. Barnwell
Keyword(s):  
Molecular Weight ◽  
Maleic Anhydride ◽  
Phthalic Anhydride ◽  
Dibasic Acid ◽  
Side Reaction ◽  
Methyl Ethyl ◽  
Cyclic Monomer ◽  
Dimethyl Terephthalate ◽  
Ethyl Malonate ◽  
Methylene Groups

New polyesters with basic units containing 6, 7, 8, 9, 10, 13, and 14 chain atoms have been prepared from levo-2,3-butanediol and ethyl oxalate, ethyl malonate, dimethyl terephthalate, maleic anhydride, succinic, glutaric, adipic, azelaic, and sebacic acids, and from meso-2,3-butanediol and o-phthalic anhydride. Esterification of 2,3-butanediol with a dibasic acid, or its anhydride, is accompanied by a side reaction, in which butanone-2 and the cyclic methyl ethyl ketal are formed. The purified polyesters, with the exception of the poly-malonate, appear to be composed of regularly recurring acid and diol segments over the molecular weight ranges investigated. Without exception they are amorphous resins or balsams. Polyesters formed from saturated aliphatic dibasic acids become progressively softer as the number of methylene groups in the acid segment increases. The polymeric oxalate, on distillation in vacuo, is converted to a macrocrystalline cyclic monomer.

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