Bis(phenylhydrazones) derived from 2,2-dialkyl cyclohexane-1,3-diones; 1E,1’E-(2,2-Dimethylcyclohexane-1,3-diylidene)bis(2-phenylhydrazine); 1E,1’E-(Spiro[4.5]decane-6,10-diylidene)bis(2-phenylhydrazine)