Mass and microwave spectroscopic studies of pyrolysis of Chloroacetaldehyde (cas 107-20-0) and its methyl derivatives
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Add time:08/26/2019 Source:sciencedirect.com
The pyrolysates of Chloroacetaldehyde (cas 107-20-0) and its methyl derivatives have been investigated by pyrolysis-mass spectrometry and microwave spectroscopy. Ketene was generated by dehydrochlorination of chloroacetaldehyde. Ketene and s-trans-acrolein were produced by the elimination of methyl chloride and by dehydrochlorination from 1- and 2-chloropropionaldehyde respectively. These facts indicate that the pyrolysis mechanisms of the precursors differ according to the position of the methyl group substituted. Methyl vinyl ketone observed from 3-chloro-2-butanone suggests that the dehydrochlorination is more dominant than the elimination of methyl chloride observed in 1-chloropropionaldehyde, and that this mechanism is quite similar to that for 2-chloropropionaldehyde. Moreover, some interesting pyrolysates, such as acetaldehyde and methyl chloride, were generated from chloroacetaldehyde, vinyl chloride from 1-chloro-propionaldehyde, and methyl acetylene and propene from 3-chloro-2-butanone. As these pyrolysates, with the exception of acetaldehyde, do not include oxygen, their pyrolysis mechanisms can not be explained without the elimination of carbon monoxide.
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