Synthesis of 2-imidazolidinone from ethylenediamine using CO 2 as a C1 building block over the SnO 2 /g-C 3 N 4 catalyst

SnO 2 /g-C 3 N 4 with balanced acid–base sites and oxygen vacancies efficiently converts ethylenediamine and CO 2 to 2-imidazolidinone, achieving 95% conversion and 99% selectivity via a green, reusable catalytic pathway.