AbstractPoly[oxy‐2,2′‐diphenyleneoxyisophthaloyl‐b‐oxy(2‐methyl‐1,3‐phenylene)oxyterephthaloyl] I, poly[oxy‐2,2′‐diphenyleneoxyterephthaloyl‐b‐oxy(2‐methyl‐1,3‐phenylene)oxyterephthaloyl] II, poly(oxy‐2,2′‐diphenyleneoxyisophthaloyl‐b‐oxy‐2,2′‐diphenyleneoxyterephthaloyl) III, poly[oxy‐2,2′‐diphenyleneoxyterephthaloyl‐b‐oxy(2‐methyl‐1,4‐phenylene)oxyterephthaloyl] IV, poly[oxy2,2′‐diphenyleneoxyterephthaloyl‐b‐oxy(2‐chloro‐1,4‐phenylene)oxyterephthaloyl] V, poly[oxy‐2,2′‐diphenyleneoxyterephthaloyl‐co‐oxy(2‐chloro‐1,4‐phenylene)oxyterephthaloyl] VI, and poly[oxy‐2,2′‐diphenyleneoxyterephthaloyl‐co‐oxy(2‐methyl‐1,4‐phenylene)oxyterephthaloyl] VII have been synthesized and characterized. Random copolyester VI appears to form a birefringent fluid phase above the melting temperature.