PYRIDAZINE DERIVATIVES AND RELATED-COMPOUNDS .6. SYNTHESIS OF TRIAZOLO {[}3',4'-5,1]PYRAZOLO{[}3,4-C]PYRIDAZINE, PYRIDO{[}2',1'-3,2]-{[}1,2,4]TRIAZOLO{[}5',1'-5,1]PYRAZOLO{[}3,4-C]PYRID AZINE AND NAPHTHO{[}2,1-E]-PYRIDAZINO{[}3',4'-3,4]PYRAZOLO{[}5,1-C] {[}1,2,4]TRIAZINE DERIVATIVES

1,2,4-Triazolo{[}3',4':5,1]pyrazolo{[}3,4-c]pyridazine, pyrido{[}2',1':3,2]{[}1,2,4]triazolo{[}5',1':5,1]pyrazolo{[}3,4-c]pyrida zine, naphtho{[}2,1-e]pyridazino{[}3',4':3,4]pyrazolo{[}5,1-c]{[}1,2,4]triazin e and pyridazino{[}3',4':3,4]pyrazolo{[}5,1-c]{[}1,2,4]triazin-4(1H)-one were synthesized from 3-amino-1H-pyrazolo{[}3,4-c]pyridazine.