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The homoallenylaldehyde 1 was prepared according to the literature [1,2]. Half an equivalent of hydrazine monohydrate [3] was added dropwise to a solution of 1 with a catalytic amount of p-TSA in diethylether [4]. The mixture was stirred at r.t. for 2 h, evaporated under reduced pressure to remove the solvent. The product was purified by column chromatography on silica gel using CH 2 Cl 2 to give the title compound (2). Liquid, 38% yield. n D 20 = 1.4910.

2,2,5-Trimethylhexa-3,4-dienal Azine