<i>Originally posted by PHILOU Zrealone </i><br>Another idea to make CH2=O:
Make Ca formate, dry it:
Then heat it under a vigorous flame (the rector must be closed vs the flame and a cold trap has to be set on since aldehydes and cetons are very
flamable and risks of fire can result!!!):
Ca(O2CH)2 --> CaCO3 + CH2=O
BTW:the same procedure is was used to make aceton...CaCO3 can be reconverted into Ca carboxysalt by agitation with the acid (vinegar)
Ca(O2C-CH3) --> CaCO3 + CH3-CO-CH3
And if I remember wel:
Ca(O2C-CH3)2 + Ca(O2C-CH2-CH3)2 -->
CaCO3 + CH3-CO-CH3 + CH3-CO-CH2-CH3 + CH3-CH2-CO-CH2-CH3
So it is a convenient way to make aceton, MEK and diethyl ceton (3 pentanone).
A final aspect I think to remember is:
Ca(O2CH)2 + Ca(O2C-CH3)2 --> CH3-CO-CH3 + CH3-CH=O + CH2=O + CaCO3
Tath's all folks!
PH Z
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