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  2. Hantzsch pyridine synthesis - Wikipedia

    en.wikipedia.org/wiki/Hantzsch_pyridine_synthesis

    Upon metabolism, 1,4-DHP based antihypertensive drugs undergo oxidation by way of cytochrome P-450 in the liver and are thus converted to their pyridine derivatives. [11] As a result, particular attention has been paid to the aromatization of 1,4-DHPs as a means to understand biological systems and so as to develop new methods of accessing ...

  3. Fruit waxing - Wikipedia

    en.wikipedia.org/wiki/Fruit_waxing

    The materials used to wax produce depend to some extent on regulations in the country of production and/or export. Both natural waxes (carnauba, [12] shellac, beeswax or resin [4]) and petroleum-based waxes (usually proprietary formulae) [3] are used, and often more than one wax is combined to create the desired properties for the fruit or vegetable being treated.

  4. Pyridine - Wikipedia

    en.wikipedia.org/wiki/Pyridine

    Pyridine is a toxic, flammable liquid with a strong and unpleasant fishy odour. Its odour threshold of 0.04 to 20 ppm is close to its threshold limit of 5 ppm for adverse effects, [117] thus most (but not all) adults will be able to tell when it is present at harmful levels. Pyridine easily dissolves in water and harms both animals and plants ...

  5. Bohlmann–Rahtz pyridine synthesis - Wikipedia

    en.wikipedia.org/wiki/Bohlmann–Rahtz_pyridine...

    In organic chemistry, the Bohlmann–Rahtz pyridine synthesis is a reaction that generates substituted pyridines in two steps, first a condensation reaction between an enamine and an ethynylketone to form an aminodiene intermediate, which after heat-induced E/Z isomerization undergoes a cyclodehydration to yield 2,3,6-trisubstituted pyridines.

  6. Boger pyridine synthesis - Wikipedia

    en.wikipedia.org/wiki/Boger_pyridine_synthesis

    The Boger pyridine synthesis is a cycloaddition approach to the formation of pyridines named after its inventor Dale L. Boger, who first reported it in 1981. [1] The reaction is a form of inverse-electron demand Diels-Alder reaction in which an enamine reacts with a 1,2,4- triazine to form the pyridine nucleus.

  7. Chichibabin pyridine synthesis - Wikipedia

    en.wikipedia.org/wiki/Chichibabin_pyridine_synthesis

    The Chichibabin pyridine synthesis (/ ˈ tʃ iː tʃ iː ˌ b eɪ b iː n /) is a method for synthesizing pyridine rings. The reaction involves the condensation reaction of aldehydes, ketones, α,β-Unsaturated carbonyl compounds, or any combination of the above, with ammonia. [1] It was reported by Aleksei Chichibabin in 1924.

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  9. Wax emulsion - Wikipedia

    en.wikipedia.org/wiki/Wax_emulsion

    However, because the preparation takes place above the melting point of the wax, the actual process is called emulsification, hence the name wax emulsion. In praxis, wax dispersion is used for solvent based systems. A wide range of emulsions based on different waxes and blends thereof are available, depending on the final application.

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