Question: The valuable polymer polyurethane is made by a condensation reaction of alcohols (ROH) with compounds that contain an isocyanate group (RNCO). Two reactions that can

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

(ii)

(a) Which process, i or ii, is greener? Explain.
(b) What are the hybridization and geometry of the carbon atoms in each C-containing compound in each reaction?
(c) If you wanted to promote the formation of the isocyanate intermediate in each reaction, what could you do, using Le ChÃ¢telier's principle?

CI CI R N-C-OR

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a Process i is greener because it does not involve the toxic reactant phosgene COC1 2 and the byprod... View full answer

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