Scheme 120. (A) Synthesis of 3-aryl-4-(arylethynyl)-2H-chromen-2-one derivatives 289, (B) 3-phenyl-4-((trimethylsilyl)ethynyl)-2H-chromen-2-one 292, (C) 3,5-dimethyl-2-(phenylethynyl)phenyl 2-phenylacetate 295, (D) 1-(phenylethynyl)naphthalen-2-yl acetate 297.¹¹⁷.