text: was first prepared in 1835 by M. Gregory by the reaction of disulfur dichloride with ammonia, a process that has been optimized:
  Coproducts of this reaction include heptasulfur imide () and elemental sulfur. A related synthesis employs  instead:
  An alternative synthesis entails the use of  as a precursor with pre-formed S–N bonds.  is prepared by the reaction of lithium bis(trimethylsilyl)amide and sulfur dichloride|.
  The  reacts with the combination of  and sulfuryl chloride| to form , trimethylsilyl chloride, and sulfur dioxide: