1.
Angew Chem Int Ed Engl
; 38(7): 956-959, 1999 Apr 01.
Article
in English
| MEDLINE
| ID: mdl-29711866
ABSTRACT
The next higher homologue of hexamethylenetetramine was synthesized as the proton cryptate H+ @1â Br- (shown schematically), and its X-ray structure determined. The proton trapped by the lone pairs accumulated at the center of the T-symmetric tetraaza cage could not be exchanged or removed, even after heating for three days in 3 M NaOD.