The valuable polymer polyurethane is made by a condensa- tion reaction of alcohols (ROH) with compounds that con- tain an isocyanate group (RNCO). Two reactions that can generate a urethane monomer are shown here: (i)

(ii)

(c) If you wanted to promote the formation of the isocya- nate intermediate in each reaction, what could you do, using Le Châtelier's principle?