Immobilization of Zn(II) on Chitosan from Callinectes Sapidus Shells as an Efficient Heterogeneous Catalyst for the Synthesis of 4H-Pyran Derivatives

Azzeddine Taoufyk, Zahira Belattmania, Khaoula Oudghiri, Elhouceine Benhadria, Noura Aflak, Moha Taourirte, Fouad Bentiss, Brahim Sabour, Lahoucine Bahsis, Mahfoud Agunaou