Aldehida: Béda antarrépisi
Konten dihapus Konten ditambahkan
mTidak ada ringkasan suntingan |
m →Kimia |
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Baris ka-26:
==Kimia==
===Nyieun===
Aya tilu métode utama pikeun nyieun aldehida:
* [[réaksi kimia|ngaréaksikeun]] [[Alkohol#Alkohol primér|alkohol primér]] jeung [[agén pangoksidasi]],
* ngaréaksikeun [[alkana]] (mun aya hidrogén [[viinl]]atan) jeung [[ozon]] nu bakal ngabalukarkeun pegatna beungkeut C=C ngahasilkeun aldehida, dina prosés nu disebut [[ozonolisis]].
* ngaréduksi [[éster]] ku [[DIBAL-H]].
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The primary means of synthesis is the [[oxidation]] of a primary alcohol. In the laboratory this may be achieved by heating the alcohol with a chromium(VI) reagent an acidified solution of [[potassium dichromate]], which is [[redox|reduced]] to green Cr<sup>3+</sup> during the reaction. Excess [[dichromate]] will further oxidise the aldehyde to form a [[carboxylic acid]], so either the aldehyde is [[distillation|distilled]] out as it forms (if [[Vapor_pressure|volatile]]), or milder methods such as [[pyridinium chlorochromate|PCC]] oxidation or [[Swern oxidation]] are used. The equation is shown below with [[propan-1-ol]] being oxidised to form propanal.
Baris 65 ⟶ 64:
*Aldehydes are reduced to [[primary alcohol]]s.
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==Conto aldehida==
* [[Métanal]] ([[Formaldehida]])
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