Synthesis of 8,8' -(polymethylene-/ o-xylyl-dioxy)di(pyrano[ 4,3-b ]-1-benzopyran- 10H-10-one) and its conversion to corresponding diacrolein derivative

Department of Chemistry, Ramakrishna Mission Vivekananda Centenary College, Rahara,
Kolkata-700 118, India
E-mail : kantachandra@rediffmail.com
Manuscript received 29 November 2010, accepted 21 March 2011

6,6'-Tethered-di(4-oxo-4H-1-benzopyran-3-carboxaldehyde) undergoes inverse electron demand [4+ 2] cycloaddition reaction with ethoxyethene to produce endo-di(pyrano[4,3-b]-1-benzopyran), which produces diacrolein when treated with NaOMe in methanol.