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Reagents and conditions: (a) 10 equiv FeCl3, 5% MeNO2 in DCM, 1 h, 18 °C; (b) 6 equiv 10-camphorsulfonic acid, 4 equiv paraformaldehyde, CHCl3, pressure tube, 90 °C, 17 h.
Paraformaldehyde-d2 and paraformaldehyde-13C were used to synthesize 42-d2 and 42-c2, respectively.
