Thermal cyclization of 1,5-diarylpent-1-yne-3,5-diones led to the formation of 2-benzyliden-5-aryl-3(2H) furanones as well as 2,6-diaryl-4H-pyran-4-ones as minor products. The structure of the furanones was established from their ir, 1H nmr and mass spectral data. Their reaction with hydrazine hydrate gave pyrazole derivatives.
                                    1,5-二芳基戊-1-炔-3,5-二酮的热环化导致形成2-苄叉基-5-芳基-3(2 H)
呋喃酮以及2,6-二芳基-4 H-
吡喃-4-ones作为次要产品。
呋喃酮的结构由其ir,1 H nmr和质谱数据确定。它们与
水合
肼反应,得到
吡唑衍
生物。