Methods, compounds, and compositions described herein generally relate to polyalkylamines and syntheses thereof. In some embodiments, a chemical compound has the formula: ##STR00001##
Each instance of R is independently selected from the group consisting of aryl, alkyl, and polyether. Each instance of R is independently selected from the group consisting of hydrogen, alkyl, aryl, cycloalkyl, polyether, and alcohol. Each instance of Q and Z is independently a covalent bond or selected from the group consisting of alkyl and aralkyl.

A process, apparatus, and cyclopropenimine (CPI) material for generating metal carbonates are disclosed. Generating the metal carbonates comprises reacting carbon dioxide (CO.sub.2) with CPI. Generating the metal carbonates also comprises forming a reaction mixture comprising water, metal cations, and a product of the reacting.

A process, apparatus, and cyclopropenimine (CPI) material for generating metal carbonates are disclosed. Generating the metal carbonates comprises reacting carbon dioxide (CO.sub.2) with CPI. Generating the metal carbonates also comprises forming a reaction mixture comprising water, metal cations, and a product of the reacting.