The polyurethane foam used for home insulation uses methane diphenyl-diisocyanate (MDI) as monomer. The MDI is prepared by acid-catalyzed reaction of aniline with formaldehyde, followed by treatment with phosgene, COCl2. Propose mechanisms for bothsteps.

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NH2 NH2 -CH2- H2N- CH20 Jcoc: Cocl2 -CH2 -N=C=0 0=c=N- MDI