Table 2. Schmidt Rearrangement in Continuous-Flow^a.

				yield (%)
entry	c2a (M)	acid, wt %	tR (min)	3a	4a	3a:4a
1	0.20	MsOH, 67	6.7	8	10	0.8:1
2	0.20	H2SO4, 66	6.7	16	17	1:1.1
3	0.20	H2SO4, 48	8.6	14	12	1.2:1
4	0.20	H2SO4, 59	8.6	28	26	1.1:1
5	0.20	H2SO4, 69	8.6	29	26	1.1:1
6	0.20	H2SO4, 77	8.6	40	39	1:1
7	0.31	H2SO4, 77	8.6	41	37	1.1:1

^aTBAA = tetrabutylammonium azide (1.35 equiv). c_2a = concentration of 2a. t_R = average retention time.