Pyridine: Difference between revisions
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*It is a colorless, highly flammable, weakly alkaline, water-soluble liquid with a distinctive, unpleasant fish-like smell. Pyridine is colorless | *It is a colorless, highly flammable, weakly alkaline, water-soluble liquid with a distinctive, unpleasant fish-like smell. Pyridine is colorless | ||
*Older or impure samples can appear yellow. | *Older or impure samples can appear yellow. | ||
*It is a | *It is a basic industrial chemical feedstock | ||
=Synthesis= | =Synthesis= | ||
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its composition depends on the catalyst used and can be adapted to the needs of the manufacturer via changing the catalyst accoordingly | its composition depends on the catalyst used and can be adapted to the needs of the manufacturer via changing the catalyst accoordingly | ||
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*[[Pyridinium Chloride]] | *[[Pyridinium Chloride]] | ||
= | =External Links= | ||
*[https://en.wikipedia.org/wiki/Pyridine The Wikipedia Page on Pyridine] | *[https://en.wikipedia.org/wiki/Pyridine The Wikipedia Page on Pyridine] | ||
[[Category: Bio-Petrochemistry]] | |||
Latest revision as of 01:16, 19 December 2020
Basics
- Pyridine is a basic heterocyclic organic compound with the chemical formula C5H5N
- It is structurally related to benzene, with one methine group (=CH−) replaced by a nitrogen atom
- It is a colorless, highly flammable, weakly alkaline, water-soluble liquid with a distinctive, unpleasant fish-like smell. Pyridine is colorless
- Older or impure samples can appear yellow.
- It is a basic industrial chemical feedstock
Synthesis
Chichibabin synthesis
Basics
- This process is carried out in a gas phase at 400–450 °C with a a transition metal salt such as cadmium(II) fluoride or manganese(II) fluoride, or cobalt and thallium compound catalyst
Inputs
- Acetaldehyde
- Formaldehyde
- Ammonia
- The catalyst
Process
- First, Acrolein is formed in a Knoevenagel condensation from the acetaldehyde and formaldehyde
- The acrolein is then condensed with acetaldehyde and ammonia to give Dihydropyridine
- This is then oxidized with a solid-state catalyst to pyridine.
Outputs
- The product consists of a mixture of pyridine, simple methylated pyridines (picolines and lutidines);
its composition depends on the catalyst used and can be adapted to the needs of the manufacturer via changing the catalyst accoordingly