CF3), -120.2--120.3 (m, 2F, -CF2CO-), -127.3 (s, 2F, -CF2-). Anal. Calcd for

CllH8NF70: C, 43.58; H, 2.66; N, 4.62. Found: C, 43.25; H, 2.86; N, 4.82.

 2,2,3,3,4,4,4-Heptafluoro-N-(1-phenylethyl)butanamide (4.9b): yield, 87%;

Colorless needles; mp 91-92 C (mp[72JPS1235] 89-90 C); 1H NMR 6 7.41-7.30 (m,

5H), 6.65 (br s, 1H), 5.19 (q, J= 7.2 Hz, 1H), 1.58 (d, J= 6.9 Hz, 3H); 19F NMR 6 -81.1

(t, J= 8.2 Hz, 3F, CF3), -121.2 -121.3 (m, 2F, -CF2CO-), -127.5 (s, 2F, -CF2-). Anal.

Calcd for C12H10NF70: C, 45.44; H, 3.18; N, 4.42. Found: C, 45.65; H, 3.56; N, 4.32.

 2,2,3,3,4,4,4-Heptafluoro-l-tetrahydro-1H-pyrrol-1-ylbutan-1-one (4.9c):

colorless oil, bp[55JACS6662] 65 C/2 mmHg; Yield, 88%; 1H NMR 6 3.71-3.67 (m,

2H), 3.66-3.59 (m, 2H), 2.06-1.99 (m, 2H), 1.97-1.88 (m, 2H); 19F NMR 6 -80.7 (t, J=

9.3 Hz, 3F, CF3), -116.0 -116.1 (m, 2F, -CF2CO-), -126.6 (s, 2F, -CF2-).

 2,2,3,3,4,4,4-Heptafluoro-1-tetrahydro-4H-1,4-oxazin-4-ylbutan-1-one (4.9d):

colorless oil, bp[98CJC549] 90 C/10 mmHg; Yield, 85%; 1H NMR 6 3.80-3.65 (m,

8H); 19F NMR 6 -80.3 (t, J= 9.3 Hz, 3F, CF3), -112.3 -112.4 (m, 2F, -CF2CO-), -126.3

(s, 2F, -CF2-).