Study of twobody and threebody channels for the reaction of metastable helium atoms with selected atomic and molecular species J. Chem. Phys. 88, 3061 (1988); 10.1063/1.453949Study of twobody and threebody channels for the reaction of metastable helium atoms with nitrogen

Communications to the Editor 3157 pyridine-dimethylformamide provided 6a-fluoro-16 -methyl-4•9 11} -pregnadiene -3,20-dione-17 ,21diol 21-acetate (m.p. 188-190°, [a]o +74°(all rotations in CHCE), ®1° 235, log e 4.17; Anal. found for C24H3i06F: C, 69.28, H, 7.24, F, 3.99), which was treated with N-bromoacetamide in aqueous dioxane in the presence of perchloric acid7 and the bromohydrin cyclized directly with potassium acetate in acetone to afford 6a-fluoro-16a-methyl-9/3,lld-oxido-A4-pregnene-3,20-dione-17,21-diol 21acetate (m.p. 188-191°). Opening of the epoxide with hydrogen fluoride in methylene chloride-tet-rahydrofuran8 led to 6 a, 9 a-difluoro-16 a-methylhydrocortisone acetate (II) (m.p. 255-260°, [a]D

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