ein the lower alkenyl contains from 2 to 5 carbon atoms such as cinnamyl and the like, aryl or substituted aryl such as loweralkylaryl or haloaryl; thienyl or subsitutited thienyl such as loweralkylthienyl or halothienyl, or R and R1 may be joined together with the carbon atoms to which they are attached to form a cycloalkyl radical containing from 3 to 7 nuclear carbon atoms, for example, cyclopr