摘要
The ethylene ketal of 2-cyelopentenone and 2-cyelohexenone in acetonitrile in the presence of a trace of an acid rapidly undergoes the Diels-Alder type dimerization,The products are regiospecific but not stereoselective and are hydrolysed sequentially to afford keto-ketals and diketones whose structures are determined by extensive applications of NMR spectroscopy.
The ethylene ketal of 2-cyelopentenone and 2-cyelohexenone in acetonitrile in the presence of a trace of an acid rapidly undergoes the Diels-Alder type dimerization,The products are regiospecific but not stereoselective and are hydrolysed sequentially to afford keto-ketals and diketones whose structures are determined by extensive applications of NMR spectroscopy.
