Preparation and physical properties ofN-defunctionalized derivatives of poly(aspartic acid)

2001 ◽  
Vol 81 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Alan R. Katritzky ◽  
Jiangchao Yao ◽  
Ming Qi ◽  
Guofang Qiu ◽  
Weilang Bao ◽  
...  
Keyword(s):  
Physical Properties ◽  
Aspartic Acid ◽  
Derivatives Of

Physical Properties of TCNQ Salts with N-Methyl Derivatives of Pyridine

1982 ◽  
Vol 85 (1) ◽  
pp. 257-263 ◽  
Author(s):  
A. Graja ◽  
M. Przybylski ◽  
B. Butka ◽  
R. Swietlik
Keyword(s):  
Physical Properties ◽  
Methyl Derivatives ◽  
Derivatives Of

Inhibition of thrombin by derivatives of the dipeptide aspartic acid-amidinophenylalanine

Peptides ◽  
1994 ◽  
pp. 643-645 ◽  
Author(s):  
W. Stüber ◽  
R. Koschinsky ◽  
C. Kolar ◽  
M. Reers ◽  
G. Dickneite ◽  
...  
Keyword(s):  
Aspartic Acid ◽  
Derivatives Of ◽  
Inhibition Of Thrombin

ansa-Chromocene Complexes. 2. Isocyanide Derivatives of Cr(II) and Cr(III), Their Syntheses, X-ray Crystal Structures, and Physical Properties

2006 ◽  
Vol 25 (3) ◽  
pp. 719-732 ◽  
Author(s):  
Pamela J. Shapiro ◽  
Ralph Zehnder ◽  
David M. Foo ◽  
Philippe Perrotin ◽  
Peter H. M. Budzelaar ◽  
...  
Keyword(s):  
Physical Properties ◽  
Crystal Structures ◽  
X Ray ◽  
Derivatives Of

Preparation of some long-chain N-acyl derivatives of essential amino acids for nutritional studies

1980 ◽  
Vol 58 (7) ◽  
pp. 573-576 ◽  
Author(s):  
Alenka Paquet
Keyword(s):  
Amino Acids ◽  
Fatty Acids ◽  
Physical Properties ◽  
Essential Amino Acids ◽  
Nutritional Studies ◽  
Derivatives Of ◽  
Acyl Derivatives ◽  
Long Chain

Long-chain N-acyl derivatives of methionine, tryptophan, threonine, and lysine (N6) have been obtained by the reaction of succinimidyl esters of fatty acids with the unprotected amino acids. Their physical properties have been characterized.

scholarly journals The Modification of Polyurethane Foams Using New Boroorganic Polyols: Obtaining of Polyols with the Use of Hydroxypropyl Urea Derivatives

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Iwona Zarzyka
Keyword(s):  
Physical Properties ◽  
Boric Acid ◽  
Propylene Carbonate ◽  
Spectral Characteristics ◽  
Polyurethane Foams ◽  
Thermal Stabilities ◽  
Urea Derivatives ◽  
Methods Of Synthesis ◽  
Derivatives Of ◽  
Substituted Urea

Methods of synthesis of new prospective polyol components for obtaining of polyurethane foams of reduced combustibility using eco-friendly substrates have been presented. With this end in view, N,N′-bis(2-hydroxypropyl)urea was esterified with boric acid and next the hydrogenborate obtained was hydroxyalkylated by the excess of propylene carbonate. The influence of the way of esterification on the hydroxypropyl derivatives of borate substituted urea properties has been investigated. Esterification was run in the presence and in the absence of solvent. According to instrumental analysis, the characteristic of hydrogenborates obtained in both methods was found to be similar. The hydroxypropyl derivatives of borate substituted urea show similar spectral characteristics and thermal stabilities and differ slightly in molar masses, by-product contents, and physical properties, particularly viscosities. The properties of these derivatives were assessed paying special attention to their application as the polyol components of polyurethane foams. Hydroxypropyl urea derivatives, modified by boric acid, show changes in physical properties with temperature, similarly to typical polyols used for obtaining of polyurethane foams.

scholarly journals Synthesis of Some New 1,2,4-Triazoles Derived from 2-Mercaptobenzimidazole

2009 ◽  
Vol 6 (1) ◽  
pp. 200-208
Author(s):  
Baghdad Science Journal
Keyword(s):  
Physical Properties ◽  
Hydrazine Hydrate ◽  
Schiff Bases ◽  
Alkaline Medium ◽  
Spectral Methods ◽  
Ring Closure ◽  
Triazole Derivatives ◽  
Specific Reactions ◽  
Derivatives Of

New 1,2,4-triazole derivatives of 2-mercaptobenzimidazole (MB) are reported. Ethyl (benzimidazole-2-yl thio) acetate (1) has been prepared by condensing 2-mercaptobenzimidazole with ethylchloroacetate. The ester (1) on reacting with hydrazine hydrate gave the corresponding acetohydrazide(2)which was reacted separately with phenylisocyanate and phenylisothiocyanate, followed by ring closure in an alkaline medium giving 3-[(benzimidazole-2-yl thio) methyl]-4-phenyl-1,2,4-triazole-5-ol and 3-[(benzimidazole-2-yl thio) methyl]-4-phenyl-1,2,4-triazole-5-thiol respectively (6,7). Reaction of acetohydrazide (2) with CS2 and ethanol/KOH, gave dithiocarbazate salt (8). Cyclization of (8) with hydrazine hydrate gave 3-[(benzimidazole-2-yl thio) methyl]-4-amino-1,2,4-triazole-5-thiol (9). Furthermore, new Schiff bases (3a-e) were prepared through the reaction of the acetohydrazide (2) with aromatic aldehydres. The prepared compounds were identified by spectral methods FTIR, UV. Measurements of some physical properties and some specific reactions, were carried out.

scholarly journals Structures and physical properties of some derivatives of 2,2′;6′,2′′-terpyridine chelating Fe/Co metal complexes

2018 ◽  
Vol 74 (a2) ◽  
pp. e391-e391
Author(s):  
I-Jui Hsu ◽  
Yan-An Chen ◽  
Ming-Jing Hsu ◽  
Yu-Chun Chuang ◽  
Jey-Jau Lee ◽  
...  
Keyword(s):  
Physical Properties ◽  
Metal Complexes ◽  
Derivatives Of
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