What are aldehydes?

Some articles on aldehyde, aldehydes:

Resorcinarene - Synthesis
... The resorcinarene macrocycle is typically prepared by condensation of resorcinol and an aldehyde in concentrated acid solution ... However, for certain aldehydes, the reaction conditions lead to significant by-products ... using solvent-free conditions resorcinol, an aldehyde, and p-toluenesulfonic acid are ground together in a mortar and pestle at low temperature ...
Other Aroma Compounds - Aldehydes
... High concentrations of aldehydes tend to be very pungent and overwhelming, but low concentrations can evoke a wide range of aromas ... Anisic aldehyde(4-anisaldehyde)-floral, sweet, hawthorn ...
Issues Relating To Biofuels - Environmental Impacts - Pollution
... Formaldehyde, acetaldehyde and other aldehydes are produced when alcohols are oxidized ... common in American E10 gasohol and elsewhere), aldehyde emissions increase 40% ... Burning biodiesel also emits aldehydes and other potentially hazardous aromatic compounds which are not regulated in emissions laws ...
Periodic Acid-Schiff Stain
... of the monosaccharide units that are parts of the long polysaccharides, and creating a pair of aldehydes at the two free tips of each broken ... The oxidation condition has to be sufficiently regulated so as to not oxidize the aldehydes further ... These aldehydes then react with the Schiff reagent to give a purple-magenta color ...
Glycol Cleavage - Reagents
... which then decompose to form ketones (if the R groups are not H) or aldehydes (if one of the R groups is H) Warm concentrated potassium permanganate (KMnO4) will react with an alkene to form a glycol and will ... The aldehydes will react further to become carboxylic acids ...