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DOI: 10.1055/sos-SD-023-00535

Tidwell, T. T.Science of Synthesis, (200623571.

Improved procedures for the preparation of monoalkylketenes include the pyrolysis of propanoic anhydride to form methylketene (2) (see Section,[‌37‌] the dehydrohalogenation of butanoyl chloride to generate ethylketene (3) for in situ stereoselective reactions (see Section,[‌38‌‌46‌] the dehydrochlorination of propanoyl chloride for in situ stereoselective dimerization (see Section ),[‌47‌] and dehalogenation of 2-bromopropanoyl bromide by zinc for conversion into the dimer (see Section[‌48‌,‌49‌]

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