Suunwzary Flash thermolysis of spiro [Z, 3lhexan-4-ones leads to vinylketen formation.The formation of allene might be interpreted as a consequence of spontaneous decarbonylation of the presumed (02 + 02) CYCLOREVERSION is known to be an operative reaction for either photochemical1 or thermal2 generation of ketens. We report our attempts to generate the still unknown dimethylene keten (1) by pyrolysis of spiro [Z, 31-
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