Synthesis of a novel series of 7-hydroxy-10-aryl-10H-indeno[1,2-b]chromen-11-ones, indeno[1,2-b]naphtho[1,2-e]pyran-12(13H)-one, and indeno[1,2-b]naphtho[3,2-e]pyran-5,11,13-trione catalyzed by reusable polyvinylpolypyrrolidone-supported triflic acid.
RESEARCH ON CHEMICAL INTERMEDIATES 2015. [DOI:
10.1007/s11164-015-1949-x]
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