Reduction of dinitrile with

Reduction of nitrostyrene with aqueous TiCl3 gives a 3,4-diarypyrrole directly in moderate yield (Eq. 10.46).52 The reaction proceeds via dimerization of anion radicals of nitrostyrene and reduction of the nitro function in the dimer to imines. Reduction of dinitrile with diisobutylalu-minum hydride (DIBAL) gives a-free pyrroles (Eq. 10.47) 53 both reactions may proceed in a similar mechanism. These pyrroles are useful intermediates for functionalized porphyrins. 

Dibenzyl sulfide, 50, 33 Diborane, 50, 90 52, 59 reduction of dinitrile with,... 

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