Can anyone please represent a suitable mechanism in a schematic way for the following reaction?

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Aaron Bloomfield

Just a guess:

Talaat I. El-Emary

Dear Devulapally Srikrishna

The mechanism suggested by Aaron Bloomfield is quite resnable and I agee with him very much.

Rahul D. Dani

Hi Devulapally, I tried doing it myself and answer came up same as what Aaron suggested. Probably this is how reaction must be happening.

Also, the reaction looks similar to what described in section XXII (preparation of pyrrole dyes) in following paper:

http://pubs.acs.org/doi/pdf/10.1021/cr60225a004

pls check.