1,3-Dinitrobenzene → 3-Fluoro-1-trifluoroacetoxyadamantane

Beteiligte Stoffe

Reaktionsschritte

A solution of 1-trifluoroacetoxyadamantane (1.0 g, 4.0 mmole, prepared by reacting adamantan-1-ol with trifluoroacetic anhydride in dry pyridine) in fluorotrichloromethane (10 ml), containing m-dinitrobenzene (80 mg, 0.48 mmole), was treated with trifluoromethyl hypofluorite (4.5 mmole) at -25° for 24 hours, air being recrystallization admitted to the reaction vessel during this time. The product was recovered in a similar manner to that described in Example 3 and was chromatographed on silica (100 g). Elution with chloroform:hexane (1:5) afforded unreacted starting material (152 mg), while elution with chloroform:hexane (1:4) gave liquid 3-fluoro-1-trifluoroacetoxyadamantane (489 mg) which appeared homogeneous by g.l.c. This product sublimed at 70° (bath)/1 mm Hg to give a crystalline solid m.p. 28°-32°; νmax (film) 1780 cm-1 ; PMR 1.5-2.6 (m, adamantyl protons); FMR φ* + 76.2 (s, CF3COO--) and + 133.5 (broad s) ppm.

Herkunft & Nachweise