16-Phenoxy prostaglandin F.sub.2.alpha. analogs

An optically active compound of the formula ##STR53## or a racemic compound of that formula and the mirror image thereof, wherein g is an integer from 2 to 5, inclusive;

• wherein M is ##STR54## wherein R.sub.1 is hydrogen or alkyl of one to 12 carbon atoms, inclusive, cycloalkyl of 3 to 10 carbon atoms, inclusive, aralkyl of 7 to 12 carbon atoms, inclusive, phenyl, or phenyl substituted with one, 2, or 3 chloro or alkyl of one to 4 carbon atoms, inclusive;
• wherein R.sub.2 and R.sub.3 are hydrogen, methyl, or ethyl;
• wherein T is alkyl of one to 3 carbon atoms, inclusive, fluoro, chloro, trifluoromethyl, or --OR.sub.4 wherein R.sub.4 is alkyl of one to 3 carbon atoms, inclusive, and wherein s is zero, one, 2, or 3, with the proviso that not more then two T's are other than alkyl;
• including each of the lower trialkanoates thereof, and each of the pharmacologically acceptable salts thereof when R.sub.1 is hydrogen.