101074-20-8Relevant articles and documents
Dication Ethers. 7 . Dication Ether Salts from Cyclic Bisureas
Maas, Gerhard,Brueckmann, Ralf,Feith, Bernhard
, p. 907 - 910 (2007/10/02)
The bicyclic bisureas 2 react with triflic anhydride to give the dication ether salts 4.Further transformation of the remaining carbonyl groups pf 4 into bis-carbenium ether linkages was not possible.The monocyclic bisurea 8 yields the dicationic heterocycle 9 in an intramolecular fashion.The structure of 9, which is the first dication ether salt with an endocyclic ether linkage, was established by independent synthesis from 10 as well as by its hydrolysis to give the hemi-protonated bisureas 11.