Patent classifications
C
CHEMISTRY; METALLURGY
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C07
ORGANIC CHEMISTRY
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C07C
ACYCLIC OR CARBOCYCLIC COMPOUNDS
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45/00
Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
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C07C45/87
Preparation of ketenes or dimeric ketenes
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C07C45/89
from carboxylic acids, their anhydrides, esters or halides
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