Ketenes cyclopropanone hemiacetal

Cyclopropanone hemiacetals and hydrate react with ketene to form acetoxy derivatives, e.g. 86 and 87, respectively. 5 15>80) As shown in Scheme 14, the diacetoxy compound 87 may also be obtained from the reaction of cyclopropanone with acetic acid and excess ketene. 83>... 

Cyclopropanone hemiacetals from ketenes and diazo compds. 

Cyclopropanone ethyl hemiacetal was first synthesized by the reaction of ketene and diazomethane 1n ether at -78°C in the presence of ethanol.4 The yield is low (43%) and the reaction 1s hazardous, especially when a large-scale reaction is required. The method described in this procedure for the preparation of cyclopropanone ethyl hemiacetal from ethyl 3-chloropropanoate... 

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