Synthesis of oxa[9]helicene derivatives by cyclodehydration of 1,1'-bibenzo[c]phenanthrene-2,2'-diol using phosphorus pentoxide
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2019 ◽
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2012 ◽
Vol 187
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pp. 776-780
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1981 ◽
Vol 103
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pp. 7796-7797
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pp. 1544-1553
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pp. 2398-2400
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