The syntheses of 6-methylene-2,4-cyclohexadien-1-imine and related o-quinonoids by FVT of 1-hetero-1,2,3,4-tetrahydronaphthalenes

Article abstract of DOI:10.1016/S0040-4039(00)78895-2

Flash vacuum thermolysis (~ 1000 °C/10^-5 hPa) of 1,2,3,4-tetrahydroquinoline chroman, and thiochroman led upon loss of ethylene (retro-Diels-Alder reaction) to the o-quinonoids 1-3. These reactive monomers were identified by IR-UV at -196 °C and/or MS/MS.