Abstract
Vacuum Flash Pyrolysis (VFP) at ca. 450–500°C and ca. 0.1–0.3 Torr of the spirocyclic malonyl peroxides ( 2a,b ) affords high yields of allenes ( 5a,b ), while the simple malonyl peroxide ( 2c ) leads to ketone ( 4 ), derived respectively from decarboxylation and decarbonylation of the intermediary α-lactones ( 3 ).
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