A compound of the formula: ##STR1## where n is 1, 2, or 3; R.sub.3 is hydrogen or loweralkyl; R.sub.4 is hydrogen or loweralkyl; and Ar is a phenyl group optionally mono-substituted with a loweralkoxy, halogen or trifluoromethyl group which are useful as intermediates.
一种化合物的公式:##STR1## 其中n为1、2或3;R.sub.3为氢或低碳基;R.sub.4为氢或低碳基;Ar为苯基,可选择性地单取代于低碳氧基、卤素或三
氟甲基基团,这些化合物是有用的中间体。