most common and effective way to obtain acetaldehyde - the oxidation of ethylene.The reaction proceeds thus:
2S2N4 + O2 = 2SN3SON
synthesis is using a catalyst - palladium chloride.Moreover, if the conduct direct oxidation of ethylene with oxygen, it is slow.Therefore, the reaction mixture was added a divalent copper salt, it is oxidized to palladium, turning itself into monovalent copper, immediately oxidized by oxygen.That is, copper in this synthesis serves as a carrier of oxygen.This reaction is called "Wacker process."
Acetaldehyde can also be obtained by conducting the hydration of acetylene.This synthesis takes place in the presence of s
alts of mercury, called "Kucherov reaction."It proceeds as follows:
C2H2 + H2O = CH3CON
Laboratory acetaldehyde can also be obtained by using as raw ethyl alcohol, is the way that many considered almost sacrilege.The reaction proceeds thus: C2H5OH = SN3SON
+ H2
That is, for ethanal, ethanol dehydrogenation is carried out at high temperature using a catalyst (silver or copper).
can not "split off" hydrogen from ethanol and to subject it to oxidation, also at high temperatures and the same catalysts.Then, the reaction goes as follows:
2S2N5ON + O2 = 2H2O + 2SN3SON