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Methyl chloroformate is the methyl ester of chloroformic acid and is an oily liquid with a color that is anywhere from yellow to colorless. It is also known for its pungent odor.
M 2045 (OTTO) Methyl chloroformate, 98% + Cas 79-22-1 - used in organic synthesis for the introduction of the methoxycarbonyl functionality to a suitable nucleophile (i.e. carbomethoxylation)