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==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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===Preparation===
There are three notable methods for preparing aldehydes:
* Reacting a [[Alcohol#Primary.2C_Secondary.2C_and_Tertiary_Alcohols|primary alcohol]] with an [[oxidizing agent]],
* Reacting an [[alkene]] (if there is a [[vinyl]]ic hydrogen) with [[ozone]] will cause the C=C bond to break yielding an aldehyde upon workup, in a process called [[ozonolysis]].
* Reacting an [[ester]] with [[DIBAL-H]] can cause reduction, yielding an aldehyde.
 
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.
 
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*Aldehydes are reduced to [[primary alcohol]]s.
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==Conto aldehida==
* [[Métanal]] ([[Formaldehida]])