“…The reaction of hydrazidine 51 with benzil 77 gives 4-amino-1,2,4-triazines 83 , preferentially. However, reaction with 4,4-dimethyl-1,2-cyclopentandione 78 gave octaaza[14]-annulen 84 . The reaction of benzylhydrazidine 51 with 2-hydroxy-4,4-dimethyl-2-cyclopenten-1-one 79 gave 4-amino-1,2,4-triazines 85 , tetrahydrotetrazine 86 , and octaaza[14]-annulen 87 (Scheme ) …”