504-29-0 Usage
Description
2-Aminopyridine is an organic compound with the chemical formula C6H6N2 and a molecular weight of 108.13 g/mol. It is a white crystalline solid that is soluble in water and has a melting point of 57-59°C. It is a heterocyclic amine with a pyridine ring and an amino group attached to the 2nd position, making it a versatile building block for various chemical syntheses.
Uses
Used in Pharmaceutical Industry:
2-Aminopyridine is used as an intermediate in chemical synthesis for manufacturing analgesic and anti-inflammatory drugs such as piroxicam and lornoxicam. It serves as a basic building block for several heterocyclic compounds and Schiff bases, which are essential in the development of pharmaceuticals.
Used in Voltage-Dependent Potassium Channel Research:
2-Aminopyridine is used as a research tool to reversibly block voltage-dependent potassium channels. This property makes it valuable in studying the function and regulation of these channels in biological systems.
Used in Hair Dye Industry:
2-Aminopyridine is a common impurity found in the synthesis of compounds used in hair dyes. Its presence can affect the quality and safety of hair dye products, making it important to monitor and control its levels during the manufacturing process.
Used as a Derivatizing Agent:
2-Aminopyridine can be used as a fluorescent label for the detection of oligosaccharides, chromatographic separation, fluorometric, or mass spectrometric analysis. Its ability to act as a derivatizing agent enhances the sensitivity and selectivity of these analytical techniques.
Used in Antimicrobial Applications:
2-Aminopyridine and its derivatives have shown potential as antimicrobial agents, making them useful in the development of new antimicrobial drugs and treatments.
Used in Anticorrosion Applications:
2-Aminopyridine and its derivatives have demonstrated potential as anticorrosion agents, which can be used to protect materials from corrosion and extend their lifespan.
Used in Molecular Sensing Applications:
2-Aminopyridine and its derivatives have shown promise as molecular sensors, which can be used to detect and monitor various chemical and biological species in different environments.
Preparation
2-Aminopyridine is manufactured using the reaction of pyridine with sodium amide (Chichibabin amination). It is obtained in high yield after the hydrolysis of the intermediate salt (Merck, 2001; Shimizu et al., 1993).
Synthesis Reference(s)
The Journal of Organic Chemistry, 72, p. 4554, 2007 DOI: 10.1021/jo070189yTetrahedron Letters, 11, p. 3901, 1970
Air & Water Reactions
Decomposes in air. Soluble in water.
Reactivity Profile
2-Aminopyridine neutralizes acids in exothermic reactions to form salts plus water. May be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. May generate hydrogen, a flammable gas, in combination with strong reducing agents such as hydrides. Reacts with oxidizing agents .
Hazard
Toxic.
Health Hazard
2-Aminopyridine causes central
nervous system effects.
Fire Hazard
2-Aminopyridine is combustible.
Safety Profile
Poison by ingestion, inhalation, subcutaneous, intravenous, and intraperitoneal routes. Toxic effects resemble strychnine poisoning. Human systemic effects by inhalation: somnolence, convulsions, and antipsychotic effects. Human central nervous system effects by inhalation. When heated to decomposition it emits highly toxic fumes of NOx,.
Potential Exposure
2-Aminopyridine is used in the manufacture of pharmaceuticals; especially antihistamines.
Carcinogenicity
The LD50 in mice by intraperitoneal injection
was 35 mg/kg; lethal doses in animals also
produced excitement, tremors, convulsions
and tetany.1 Fatal doses were readily absorbed
through the skin. A 0.2 M aqueous solution
dropped in a rabbit’s eye was only mildly
irritating.
2-Aminopyridine was not mutagenic in
a variety of Salmonella tester strains with or
without metabolic activation.
Environmental fate
Soil. When radio-labeled 4-aminopyridine was incubated in moist soils (50%) under aerobic
conditions at 30 °C, the amount of 14CO2 released from an acidic loam (pH 4.1) and an alkaline,
loamy sand (pH 7.8) was 0.4 and 50%, respectively (Starr and Cunningham, 1975).
Chemical/Physical. Releases toxic nitrogen oxides when heated to decomposition (Sax and
Lewis, 1987).
Shipping
UN2671 Aminopyridines, Hazard Class: 6.1; Labels: 6.1-Poisonous materials.
Purification Methods
It crystallises from *benzene/pet ether (b 40-60o) or CHCl3 /pet ether. [Beilstein 22/8 V 280.]
Waste Disposal
Incineration with nitrogen oxides removal from effluent gas.
Check Digit Verification of cas no
The CAS Registry Mumber 504-29-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,0 and 4 respectively; the second part has 2 digits, 2 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 504-29:
(5*5)+(4*0)+(3*4)+(2*2)+(1*9)=50
50 % 10 = 0
So 504-29-0 is a valid CAS Registry Number.
InChI:InChI=1/C5H6N2/c6-5-3-1-2-4-7-5/h1-4H,(H2,6,7)/p+1
504-29-0Relevant articles and documents
A novel approach towards chemoselective reduction of nitro to amine
Dasgupta, Hridoydip Ranjan,Mukherjee, Suvodip,Ghosh, Pranab
, (2019)
Chemo selective reduction of a wide range of aromatic nitro compound has been performed by using inexpensive Zn powder and CuSO4 system in water medium at room temperature. This system has high tolerance to other highly reducible groups present in nitro substance along with high conversation and selectivity. This chemo-selective reduction also provides a facile root for the synthesis of other industrially important fine chemicals or biologically important compounds where other highly reducible groups are present in close proximity to the targeted nitro groups.
One-Pot Fabrication of Pd Nanoparticles?Covalent-Organic-Framework-Derived Hollow Polyamine Spheres as a Synergistic Catalyst for Tandem Catalysis
Yang, Xinyi,He, Yajun,Li, Liuyi,Shen, Jinni,Huang, Jianhui,Li, Lingyun,Zhuang, Zanyong,Bi, Jinhong,Yu, Yan
, p. 1864 - 1870 (2020)
Facile fabrication of nanocatalysts consisting of metal nanoparticles (NPs) anchored on a functional support is highly desirable, yet remains challenging. Covalent organic frameworks (COFs) provide an emerging materials platform for structural control and functional design. Here, a facile one-pot in situ reduction approach is demonstrated for the encapsulation of small Pd NPs into the shell of COF-derived hollow polyamine spheres (Pd?H-PPA). In the one-pot synthetic process, the nucleation and growth of Pd NPs in the cavities of the porous shell take place simultaneously with the reduction of imine linkages to secondary amine groups. Pd?H-PPA shows a significantly enhanced catalytic activity and recyclability in the tandem dehydrogenation of ammonia borane and selective hydrogenation of nitroarenes through an adsorption–activation–reaction mechanism. The strong interactions of the secondary amine linkage with borane and nitroarene molecules afford a positive synergy to promote the catalytic reaction. Moreover, the hierarchical structure of Pd?H-PPA allows the accessibility of active Pd NPs to reactants.
Dual Reactivity of 1,2,3,4-Tetrazole: Manganese-Catalyzed Click Reaction and Denitrogenative Annulation
Chattopadhyay, Buddhadeb,Das, Sandip Kumar,Khatua, Hillol,Roy, Satyajit
, p. 304 - 312 (2020/10/29)
A general catalytic method using a Mn-porphyrin-based catalytic system is reported that enables two different reactions (click reaction and denitrogenative annulation) and affords two different classes of nitrogen heterocycles, 1,5-disubstituted 1,2,3-triazoles (with a pyridyl motif) and 1,2,4-triazolo-pyridines. Mechanistic investigations suggest that although the click reaction likely proceeds through an ionic mechanism, which is different from the traditional click reaction, the denitrogenative annulation reaction likely proceeds via an electrophilic metallonitrene intermediate rather than a metalloradical intermediate. Collectively, this method is highly efficient and offers several advantages over other methods. For example, this method excludes a multi-step synthesis of the N-heterocyclic molecules described and produces only environmentally benign N2 gas a by-product.
Development and Application of Efficient Ag-based Hydrogenation Catalysts Prepared from Rice Husk Waste
Unglaube, Felix,Kreyenschulte, Carsten Robert,Mejía, Esteban
, p. 2583 - 2591 (2021/04/09)
The development of strategies for the sustainable management and valorization of agricultural waste is of outmost importance. With this in mind, we report the use of rice husk (RH) as feedstock for the preparation of heterogeneous catalysts for hydrogenation reactions. The catalysts were prepared by impregnating the milled RH with a silver nitrate solution followed by carbothermal reduction. The composition and morphology of the prepared catalysts were fully assessed by IR, AAS, ICP-MS, XPS, XRD and STEM techniques. This novel bio-genic silver-based catalysts showed excellent activity and remarkable selectivity in the hydrogenation of nitro groups in both aromatic and aliphatic substrates, even in the presence of reactive functionalities like halogens, carbonyls, borate esters or nitriles. Recycling experiments showed that the catalysts can be easily recovered and reused multiple times without significant drop in performance and without requiring re-activation.
