Synthesis of diethyl 2H‐naphtho[2,1,b]pyran‐2,3‐dicarboxylate and some related compounds as UV absorbers

Purpose Synthesis and evaluation of new naphthopyran and related compounds as ultraviolet absorbers. Design/methodology/approach The new naphthopyran and related compounds were prepared using new synthesis methodology which gave new derivatives via positions not accessible by traditional methods. Findings A new method for the preparations of naphthopyran was developed. The naphthopyran compounds prepared had promising UV absorption/protection capabilities. Practical implications The new compounds synthesised had unique character enabling them to be used in applications such as UV absorber and sunscreen. Originality/value New method of synthesis and the possibility of using the naphthopyran derivatives as UV absorber in many applications.