408345.sch.005a
408345.sch.005b
408345.sch.005c
408345.sch.005d
408345.sch.005e
408345.sch.005f
408345.sch.005g
Scheme 5: Fragmentation pathways involving all tautomeric structures of diethyl-2-cyano-3-methyl-2-pentenodiate.