Boron Complexes of Malonodiimidates and Dithiomalonodiimidates

Article abstract of DOI:10.1002/ardp.19843171014

Diethyl malonodiimidate (2) reacts with boron trifluoride etherate to form 4,6-diethoxy-2,2-difluoro-3-aza-1-azonia-2-borato-4,6-cyclohexadiene (5) or its tetrafluoroborate (4).In a similar manner, 2 condenses with ethyl diphenyl borate (7a), triethylborane (7b) or trimethyl borate (7c) to give the neutral complexes 8a-c.These can be partially protonated with HBF4 to yield the salts 9a, b.Reaction of 7 with dimethyl dithiomalonodiimidate, which exists in the tautomeric form 12, leads to the isolation of the neutral complexes 13a-c.Protonation of 13a, b with HBF4 yields the tetrafluoroborates 14a, b.