Cyclization of 1-hydrazinyl-3,3-dimethyl-3,4-tetrahydro-5
H
-benzo
c
azepine with ethyl orthoformate gave 5,5-dimethyl-6,7-dihydro-5
H
benzo
c
-1,2,4-triazolo3,4-
a
azepine, and its reaction with ...acetic acid afforded 3,5,5-trimethyl-9,10-dimethoxy-6,7-dihydro-5
Н
-benzo
c
-1,2,4-triazolo3,4-
a
azepine. Nitrosation of 1-hydrazino-3,3-dimethyl-3,4-tetrahydro-5
H
-benzo
c
azepine led to the formation of substituted 6,7-dihydro-5
H
-benzo
c
tetrazolo5,1-
a
azepines.
