- Sodium carbonate as a solid-phase reagent for the generation of acetylketene
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Reaction of a toluene solution of 3-oxobutanoyl chloride (14) with Na2CO3 in the presence of a catalytic amount of triethylamine at -78 °C generates a solution of acetylketene (2), the dimer of which was isolated. Acetylketene (2) was trapped with 2-propanone, 2-propanol, and ethyl vinyl ether.
- Bell, Kelcey,Sadasivam, Dhandapani V.,Gudipati, Indra Reddy,Ji, Hua,Birney, David
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- 6-Methyl-2H-1,3-oxazin-2,4(3H)dione-3-sulfohalides
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3-Sulfohalides of 6-methyl-2H-1,3-oxazin-2,4(3H)-dione of the formula I STR1 in which X represents fluorine or chlorine are prepared by reacting fluorosulfonyl isocyanate or chlorosulfonyl isocyanate, at a temperature of from -35° to +70° C, optionally in the presence of an inert solvent, with diketene, acetoacetyl fluoride, acetoacetyl chloride, acetoacetic acid or an isopropenyl ester of the formula CH2 =C(OOCR)-CH3 in which R represents an alkyl radical having from 1 to 4 carbon atoms, a substituted or unsubstituted phenyl or benzyl radical.
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