O. Siri et al., SYNTHESIS AND CHARACTERIZATION OF 0,10-TETRAMETHYL-1,5,8,12-TETRAAZACYCLOTETRADECANE - A NEW ROUTE TO MACROCYCLIC POLYAMIDES AND POLYAMINES, Comptes rendus de l'Academie des sciences. Serie IIc, Chimie, 1(9), 1998, pp. 557-560
The 1:1 and 2:2 cyclization reactions were simultaneously observed by
addition of diethyl oxalate on 3,3,10,10-tetramethyl-1,5,8,12-tetraaza
dodecane. The resulting 1:1 cyclisation product was fully characterize
d by spectroscopy and X-ray diffraction study. The reduction of this c
ompound gives the 0,10-tetramethyl-1,5,8,12-tetraazacyclotetradecane w
ith a high yield. (C) Academie des sciences/Elsevier, Paris.