not methyl when the other is fluoro and y is a valence bond ch 2 or ch 2 2 wherein q is oxo u03b1 h u03b2 h u03b1 r 8 u03b2 oh or u03b1 oh u03b2 r 8 wherein r 8 is hydrogen or alkyl of one to 4 carbon atoms inclusive 1 c r 5 r 6 c g h 2g ch 3 wherein c g h 2g is alkylene of one to 9 carbon atoms inclusive with one to 5 carbon atoms inclusive in the chain between cr 5 r 6 and terminal methyl wherein r 5 and r 6 are hydrogen alkyl of one to 4 carbon atoms inclusive or fluoro being the same or different with the proviso that one of r 5 and r 6 is fluoro only when the other is hydrogen or fluoro and the further proviso that neither r 5 nor r 6 is fluoro when z is oxa o wherein z represents an oxa atom o or c j h 2j wherein c j h 2j is a valence bond or alkylene of one to 9 carbon atoms inclusive with one to 6 carbon atoms inclusive between cr 5 r 6 and the ph wherein t is alkyl of one to 4 carbon atoms inclusive fluoro chloro trifluoromethyl or or 7 wherein r 7 is alkyl of one to 4 carbon atoms inclusive and s is zero one 2 or 3 with the proviso that not more than two t 39 s are other than alkyl and when s is 2 or 3 the t 39 s are either the same or different wherein w 1 is u03b1 oh u03b2 h u03b1 h u03b2 oh oxo methylene u03b1 h u03b2 h.