A new application of natural asphalt (mineral bitumen) in chemistry as a novel class of carbonaceous compound: Synthesis and characterization of NA-SO3H@Oxalic Acid@ CuI as a heterogeneous and reusable catalyst for the synthesis of symmetric diaryl guanidine

Sedigheh Moradnejati, Mohammad Soleiman‐Beigi, Ensieh Ghasemian Lemraski