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Additionally, SnCl 2 is used to selectively reduce aromatic nitro groups to anilines. [11] Aromatic nitro group reduction using SnCl 2. SnCl 2 also reduces quinones to hydroquinones. Stannous chloride is also added as a food additive with E number E512 to some canned and bottled foods, where it serves as a color-retention agent and antioxidant.
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Stephen aldehyde synthesis, a named reaction in chemistry, was invented by Henry Stephen (OBE/MBE).This reaction involves the preparation of aldehydes (R-CHO) from nitriles (R-CN) using tin(II) chloride (SnCl 2), hydrochloric acid (HCl) and quenching the resulting iminium salt ([R-CH=NH 2] + Cl −) with water (H 2 O).
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The additional water molecules link together the molecules of [SnCl 4 (H 2 O) 2] through hydrogen bonds. [3] Although the pentahydrate is the most common hydrate, lower hydrates have also been characterised. [4] Aside from water, other Lewis bases form adducts with SnCl 4. These include ammonia and organophosphines.
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SnO 2 + 2 KSCN → SnS + K 2 S + 2CO + N 2. SnS also forms when aqueous solutions of tin(II) salts are treated with hydrogen sulfide. [5] This conversion is a step in qualitative inorganic analysis. At cryogenic temperatures, stannous chloride dissolves in liquid hydrogen sulfide. It then decomposes to the sulfide, but only slowly. [6]