2-Fluoro-, S-flUOrO-, and 6-fluoroisoproterenol were synthesized by reduction of the Schiff base formed between the corresponding ring-fluorinated 3, 4-bis (benzyloxy) phenethanolamine and acetone, followed by reductive debenzylation in the presence of oxalic acid to yield crystalline neutral oxalates. The apparent 0-adrenergic potencies were determined in the isolated guinea pig atria. 2-Fluoro-and 5-fluoroisoproterenol were ...