SEVERAL new indenopyridine, indenothiophene, indenoisoxazole ,indenopyrazole, 2,2-bis (2,5-dihydroxyphenyl) indane-1,3-dione and indane-1-one derivatives which have a biological usage as potential biodegradable agrochemicals, and blood anticoagulants were prepared from cyclic ketones (1a-d) and active methylene nitriles (2a,b) as starting components.
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