Alkynes and Cumulenes XXI1). – On Some New Oligomers of Allene The thermaloligomerization of allene (1) in the gas phase has been reinvestigated. AT 260°C and low conversions, 1,6,7‐trimethylenespiro[3.5]nonan (14) and 1,2,5,6‐tetramethylene cyclooctane (15) have been detected besides the already known thermal oligomers 2‐8, increase of substrate concentration and reaction time lead to significant amounts of a hexamer fraction which contains the new allene oligomers 16‐23 according to sepctroscopic analysis, Possible routes of formation of the unusual hexamers 16and 20 are discussed.
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Hopf et al. (1990) studied this question.
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