IV (see Scheme I) propanolamines [oxprenolol (11) propranolol (III), etc.]. Only relatively few examples of arylpropanolamines and arylbutanolamines have been described in the literature and investigated as@-blocking agents. 14 All these compounds are much weaker@-receptor blockers than the corresponding (aryloxy) propanolamines, and it was therefore concluded that in addition to the optimal length of the side-chain, the ether ...