如上如上如上如上如上
2007-02-07 18:31:46 · 2 個解答 · 發問者 simon 6 in 科學 ➔ 化學
Pyridine is used as a base in many organic solution since the N atom in the pyridine molecule can absorb the proton generated during the reaction and it can then shift the equilibrium to the product side. The N in pyridine is an imine nitrogen which is not easily to be oxidized as amine. Also, it is less reactive towards the substitution reaction. It is a good base for an reaction.
Besides, pyridine is a good polar solvent with moderate boiling temperature slightly over 100C. This is good to be used for some reactions of polar substance and a basic medium is required. However, pyridine easily absorb a lot of water. It must purified to eliminate all the water before use.
2007-02-08 10:18:17 · answer #1 · answered by Po Hung 6 · 0⤊ 0⤋
Pyridine (「o比」啶) is a common organic compound with the following structure.
圖片參考：http://www.brenda.uni-koeln.de/Mol/Mol.image.php4?ID=15987&size=small
Its melting point is -42oC, boiling point 115.5oC, and density 0.9827 g cm-3. At room conditions, it is a colourless liquid which is miscible with water and many organic liquids.
In many organic reactions, pyridine is used as the solvent. For example, pyridine is usually used as a solvent in chlorination by SOCl2.
2007-02-07 19:02:07 · answer #2 · answered by Uncle Michael 7 · 0⤊ 0⤋