Hydrazine hydrate (1:1) → 2-Fluoro-9-fluorenone hydrazone

Beteiligte Stoffe

Reaktionsschritte

A mixture of commercially available (Aldrich Chemical, Inc.) 2-fluoro-9-fluorenone (11) (10 g, 50.5 mmoL) and hydrazine monohydrate (10 mL , 200 mmoL, 4 eq) in ethanol (250 mL ) was refluxed for 1.5 h. The solution was then reduced in volume (to about a 100 mL) and chilled. The solid that separated was collected by filtration, washing with cold ethanol to provide 6.5 g (60%) of product (12): mp 161°-165° C.; IR (KBr) 3390, 3310, 3200, 1450 cm-1 ; 1H NMR (CDCl3, 200 MHz) 7.85 (bd, 1H, J=7.3Hz), 7.69 (bd, 1H, J=7.1Hz), 7.57 (dd, 1H, J=4.8, 8.1Hz), 7.36 (m, 3H), 7.02 (ddd, 1H, J=2.5, 8.3, 9.2Hz), 6.48 (bs, 2H); MS m/z 212 (M+), 183 (base peak).

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