Phosphorus, Sulfur, and Silicon and the Related Elements, V 66, 1992 , p 311
Maher F. El-zohry
NONCONVENTIONAL FRIEDEL-CRAFTS CHEMISTRY III. ON THE REGIOSPECIFIC SYNTHESIS OF SPIRO[CYCLOALKANE-1,1'-ISOTHIOCHROMAN]-4'-ONE DERIVATIVES
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http://dx.doi.org/10.1080/10426509208038362Спасибо.