1,4,8,11-tetrazacyclotetradecane-5,7-dione

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: bisacylating 1,3-diaminopropane by reacting it with 2 equivalents of chloroacetyl chloride in the presence of an alkali metal carbonate and a chlorinated aliphatic hydrocarbon at a temperature of from 0° to 30° C. for a period of between 90 minutes and 4 hours to obtain the dichlorodiamide compound of formula I ##STR5## 2) cyclizing the dichlorodiamide compound prepared in the first step by reacting it with an quivalent amount of 1,3-diaminopropane in the presence of an alkali metal carbonate and acetonitrile at a temperature of from 78° to 83° C. for a period of between 20 and 30 hours to obtain dioxocyclam of formula II ##STR6## 3) reducing the dioxocyclam compound prepared in the second step by reacting it with sodium bis(2-methoxy-ethoxy) aluminum hydride in the presence of an aromatic hydrocarbon at a temperature of from 20° to 35° C. for a period of between 90 minutes and 4 hours to obtain 1,4,8,11-tetraazacyclotetradecane of formula III ##STR7## prepared in the second step of from 20° to 35° C. of between 90 minutes and 4 hours

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: bisacylating 1,3-diaminopropane by reacting it with 2 equivalents of chloroacetyl chloride in the presence of an alkali metal carbonate and a chlorinated aliphatic hydrocarbon at a temperature of from 0° to 30° C. for a period of between 90 minutes and 4 hours to obtain the dichlorodiamide compound of formula I ##STR5## 2) cyclizing the dichlorodiamide compound prepared in the first step by reacting it with an quivalent amount of 1,3-diaminopropane in the presence of an alkali metal carbonate and acetonitrile at a temperature of from 78° to 83° C. for a period of between 20 and 30 hours to obtain dioxocyclam of formula II ##STR6## 3) reducing the dioxocyclam compound prepared in the second step by reacting it with sodium bis(2-methoxy-ethoxy) aluminum hydride in the presence of an aromatic hydrocarbon at a temperature of from 20° to 35° C. for a period of between 90 minutes and 4 hours to obtain 1,4,8,11-tetraazacyclotetradecane of formula III ##STR7## prepared in the second step of from 20° to 35° C. of between 90 minutes and 4 hours