Results 1 to 10 of about 51,809 (295)

Investigations of the reactivity of pyridine carboxylic acids with diazodiphenylmethane in protic and aprotic solvents, Part I: Pyridine mono-carboxylic acids [PDF]

Journal of the Serbian Chemical Society, 2005
Rate constants for the reaction of diazodiphenylmethane with isomeric pyridine carboxylic acids were determined in chosen protic and aprotic solvents at 30 °C, using the well known UV spectrophotometric method.
Marinković Aleksandar D., Drmanić Saša Ž., Jovanović Bratislav Ž., Mišić-Vuković Milica M.   +3 more
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Investigations of the reactivity of pyridine carboxylic acids with diazodiphenylmethane in protic and aprotic solvents. Part II. Pyridine mono-carboxylic acid N-oxides [PDF]

Journal of the Serbian Chemical Society, 2006
The rate constants for the reaction of three isomeric pyridine mono-carbocylic acid N-oxides with diazodiphenylmethane were determined at 30 ºC in thirty two protic and aprotic solvents by the well known UV spectrophotometric method.
MILICA MISIC-VUKOVIC, ALEKSANDAR D. MARINKOVIC, BRATISLAV Z. JOVANOVIC, SASA Z. DRMANIC   +3 more
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The effects of solvents and structure on the electronic absorption spectra of the isomeric pyridine carboxylic acid N-oxides [PDF]

Chemical Industry and Chemical Engineering Quarterly, 2013
The ultraviolet absorption spectra of the carboxyl group of three isomeric pyridine carboxylic acids N-oxides (picolinic acid N-oxide, nicotinic acid N-oxide and isonicotinic acid N-oxide) were determined in fourteen solvents in the wavelength range ...
Drmanić Saša Ž., Nikolić Jasmina B., Marinković Aleksandar D., Šekularac Gavrilo M., Jovanović Bratislav Ž.   +4 more
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Doebner-type pyrazolopyridine carboxylic acids in an Ugi four-component reaction [PDF]

Beilstein Journal of Organic Chemistry, 2019
Substituted 1H-pyrazolo[3,4-b]pyridine-4- and 1H-pyrazolo[3,4-b]pyridine-6-carboxamides have been synthetized through a Doebner–Ugi multicomponent reaction sequence in a convergent and versatile manner using diversity generation strategies: combination ...
Maryna V. Murlykina, Oleksandr V. Kolomiets, Maryna M. Kornet, Yana I. Sakhno, Sergey M. Desenko, Victoriya V. Dyakonenko, Svetlana V. Shishkina, Oleksandr A. Brazhko, Vladimir I. Musatov, Alexander V. Tsygankov, Erik V. Van der Eycken, Valentyn A. Chebanov   +11 more
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2-(Phenylsulfanyl)pyridine-3-carboxylic acid [PDF]

Acta Crystallographica Section E Structure Reports Online, 2009
The title compound, C(12)H(9)NO(2)S, belongs to the nitro-gen-containing group of heterocyclic organic compounds and crystallized with two mol-ecules per asymmetric unit. In the crystal, both molecules form investment dimers linked by pairs of O-H-O hydrogen bonds. Weak symmetry-related C-H-O inter-actions link the carboxyl dimers along b axis.
Muhammad Naeem Khan, Misbahul Ain Khan, Muhammad Nadeem Arshad, Islam Ullah Khan, Salma Rehman   +4 more
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2-(Carboxymethylsulfanyl)pyridine-3-carboxylic acid monohydrate [PDF]

Acta Crystallographica Section E Structure Reports Online, 2010
The title compound, C(8)H(7)NO(4)S·H(2)O, was obtained by reaction of 2-mercaptopyridine-3-carboxylic acid with chloro-acetic acid. In the mol-ecular structure, the dihedral angle between the two least-squares planes defined by the pyridine ring and the carb-oxy group is 8.32 (9)°.
Xiao-Juan Wang, Yun-Long Feng
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2-Bromopyridine-3-carboxylic acid [PDF]

Acta Crystallographica Section E Structure Reports Online, 2010
Le résidu d'acide carboxylique dans le composé du titre, C(6)H(4) BrNO (2), est tordu hors du plan des autres atomes, comme indiqué par l'angle de torsion (Br) C-C-C-O (carbonyl) de -20,1 (9)°. Dans le cristal, des chaînes supra-moléculaires médiées par des liaisons hydrogène O-H ?N sont formées avec le vecteur de base [201] et les interactions C-H ?O ...
R.A. Howie, Rinaldo Gonçalves, M.V.N. De Souza, Edward R. T. Tiekink, J.L. Wardell   +4 more
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Convenient approaches to the synthesis of 6-amino- and 6-oxoimidazo[4,5-b]pyrazolo[3,4-e]pyridines

Журнал органічної та фармацевтичної хімії, 2021
Aim. To develop convenient approaches to the synthesis of 6-amino- and 6-oxoimidazo[4,5-b]pyrazolo[3,4-e]pyridines as promising biologically active scaffolds. Results and discussion.
Georgiy G. Yakovenko, Mikhailo V. Vovk
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5-Chloroisoxazoles: A Versatile Starting Material for the Preparation of Amides, Anhydrides, Esters, and Thioesters of 2H-Azirine-2-carboxylic Acids

Molecules, 2022
Amides, anhydrides, esters, and thioesters of 2H-azirine-2-carboxylic acids were prepared by a rapid procedure at room temperature involving FeCl2-catalyzed isomerization of 5-chloroisoxazoles to 2H-azirine-2-carbonyl chlorides, followed by reaction with
Anastasiya V. Agafonova, Mikhail S. Novikov, Alexander F. Khlebnikov   +2 more
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3-tert-butoxycarbonylamino-pyridine-2-carboxylic Acid [PDF]

Molbank, 2007
To the carbamic acid tert-butylester 1 (1.03 g, 4.08 mmol) in methanol (15 ml) was added 1.4 equivalents of NaOH (2N).[...]
Rachid Mamouni, Mohammadine El Haddad, Mohamed Akssira   +2 more
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