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benzylideneacetone : ウィキペディア英語版
benzylideneacetone

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Benzylideneacetone is the organic compound described by the formula C6H5CH=CHC(O)CH3. Although both ''cis''- and ''trans''-isomers are possible for the α,β-unsaturated ketone, only the trans isomer is observed. Its original preparation demonstrated the scope of condensation reactions to construct new, complex organic compounds.〔Claisen, L. "Über die Einwirkung von Aceton auf Furfural und auf Benzaldehyd bei Gegenwart von Alkalilauge" Berichte der deutschen chemischen Gesellschaft 1881, volume 14, p 2468-2471.〕
==Preparation==
Benzylideneacetone can be efficiently prepared by the NaOH-induced condensation of the readily available reagents acetone and benzaldehyde:
:CH3C(O)CH3 + C6H5CHO → C6H5CH=CHC(O)CH3 + H2O
:

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