Table 5. Intramolecular and Intermolecular Competition Studies on the Effect of Base in Amidation reactions^a.

entry	base	4b (%)	2a (%)	6b (%)	unknown (%)
1	triethylamine	23	8	3	2
2	2,6-lutidine	44	5	0	0

^aYield was determined with ¹⁹F{¹H}-NMR using α,α,α-trifluorotoluene as an internal standard.