1.

How will you obtain the following from methyl isocyanide? (i) dimethylamine ltBrgt (ii) Methyl isothiocyanate

Answer»

Solution :(i) Reduction of isocyanides with `H_(2)`/RANEY Ni or `H_(2)//PD` or `LiAlH_(4)` gives `2^(@)` AMIDES.
`underset("Methylisocyanide")(CH_(3)-Noverset(to)(=)C) underset("or "LiAlH_(4)//ETHER)overset(H_(2)//"Raney. Ni or Pd")to underset("Dimethylamine")(CH_(3)-NH-CH_(3))`
(ii) HEATING methyl isocyanide with sulphur gives methyl isothiocyanate
`underset("Methylisocyanide")(CH_(3)-N=C:)+S overset(Delta)to underset("Methylisothiocyanate")(CH_(3)-N=C=S)`


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