[Hmim][HSO4]: An Efficient and Reusable Catalyst for the Synthesis of Spiro[dibenzo[a,i]-xanthene-14,3'-indoline]-2',8,13-triones and Spironaphthopyran[2,3-d]pyrimidine-5,3'-indolines
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- Bulletin of the Korean Chemical Society
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- v.33 no.2
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- pp.714-716
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- 2012