Edwin I. G. Brown, Derek Leaver and David M. McKinnon
The dithiole series. Part 6. Intermediacy of spirothiopyrans in reactions of 3,5-disubstituted 1,2-dithiolylium salts with cationic heterocycles containing reactive methyl groups
J. Chem. Soc., Perkin Trans. 1, 1977, 1511
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http://dx.doi.org/10.1039/P19770001511