Nitric Acid → HCID 67264820, compound

Participants

Reaction Steps

To 100 mL of HNO3 (90%) at −30° C. was slowly added 12 g 1,1-dimethyl-3,4-dihydronaphthalen-2(1H)-one (Ref.: J. Am. Chem. Soc. (1993), 115, 10628). The mixture was stirred for 10 minutes and slowly poured onto 600 mL of ice water containing 120 g of KOH (more ice was added as necessary to keep the mixture cool). The mixture was extracted with ethyl acetate, dried with sodium sulfate, filtered and concentrated in vacuo. The isomers were separated iterative silica gel column using 20% ethyl acetate in hexanes followed by trituration with ethyl ether to provide 3.8 g of the higher Rf 1,1-dimethyl-6-nitro-3,4-dihydronaphthalen-2(1H)-one: 1H NMR (300 MHz, CDCl3) δ 8.1 (dd, 1H, C7-H), 8.0 (d, 1H, C5-H), 7.5 (d, 1H, C8-H), 3.2 (t, 2H), 2.7 (t, 2H), 1.5 (s, 6H), and 5.1 g of the lower Rf 1,1-dimethyl-7-nitro-3,4-dihydronaphthalen-2(1H)-one: 1H NMR (300 MHz, CDCl3) δ 8.2 (d, 1H, C8-H), 8.0 (dd, 1H, C6-H), 7.3 (d, 1H, C5-H), 3.2 (t, 2H), 2.7 (t, 2H), 1.5 (s, 6H).

Provenance & Evidence