Repeat the calculations of the preceding problem using NH3 as the base, and put the four reactions in order of the magnitudes of their ΔH values.
Reference of preceding problem.
a. Use Drago’s E and C parameters to calculate ΔH for the reactions of pyridine and BF3 and of pyridine and B(CH3)3. Compare your results with the reported experimental values of -71.1 and -64 kJ/mol for pyridine–B(CH3)3 and
-105 kJ/mol for pyridine–BF3.
b. Explain the differences found in part a in terms of the structures of BF3 and B(CH3)3.
c. Explain the differences in terms of HSAB theory.
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