Flash Vacuum Thermolysis (FVT) of 2,2′-diethynylbiphenyl (6) gave, instead of pyrene (5), acephenanthrylene (10) and fluoranthene (11) as major products. The unequivocal identification of 9-ethynylphenanthrene (12) at T ⩽ 800 °C suggests that 12 is the initial stable product derived from 6. It is documented that under high-temperature conditions in the gas phase compound 12 is efficiently converted
2,2′-二
乙炔基
联苯(6)的快速真空热解(FVT)代替主要的pyr(5),得到了对
苯二甲腈(10)和
荧蒽(11)。9- ethynylphenanthrene(的明确鉴定12)在Ť ⩽800℃表明,12是衍生自初始稳定的产品6。据记载,在高温条件下,气相化合物12有效地转化为10,随后重排为11。由6形成12通过对6的
乙炔基部分进行分子内环化,然后逆向卡宾CH插入和1,2-H移位,通过瞬时形成环丁[ 1 ]
菲(13)来合理化α-。
2,2'-双(1-
氯乙烯基)
联苯(15)的独立FVT结果支持了这种解释。