in sulfuryl dichloride
dropwise addition of a SnCl4-containing sulfurylchloride soln. into a SO3-containing sulfurylchloride soln.; formation after boiling for a period of 40 hours; SnCl4:SO3 (molar ratio): 1:6;; removal of sulfurylchloride impurities by washing and drying in a vacuum;;
Fishwick, M.; Wallbridge, M. G. H.
Journal of Organometallic Chemistry, 1970 , vol. 25, p. 69 - 79
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Gmelin Handbook: Sn: Org.Verb.1, 1.1.1.14.2, page 133 - 136