Reactions of an Isolable Dialkylstannylene with Carbon Disulfide and Related Heterocumulenes Chenting Yan Zheng Xu Xu-Qiong Xiao Zhifang Li Qiong Lu Guoqiao Lai Mitsuo Kira 10.1021/acs.organomet.6b00208.s001 https://acs.figshare.com/articles/journal_contribution/Reactions_of_an_Isolable_Dialkylstannylene_with_Carbon_Disulfide_and_Related_Heterocumulenes/3187999 The reaction of isolable dialkylstannylene <b>1</b> with an excess amount of CS<sub>2</sub> produces an isomeric mixture of 3,3′-distanna-2,2′,4,4′-tetra­thia­bicyclo­butylidene <b>8</b> and 3,7-distanna-2,4,6,8-tetra­thia­bicyclo­[3.3.0]­oct-1(5)-ene <b>9</b> with a ratio depending on the reaction conditions. Compounds <b>8</b> and <b>9</b> are separated by column chromatography and characterized by NMR spectroscopy and X-ray crystallography. Detailed investigation of the reaction has revealed that the initial product is <b>8</b>, which isomerizes to <b>9</b> irreversibly under the catalytic influence of <b>1</b> as a Lewis acid. The above view is supported by the theoretical DFT calculations. Treatment of <b>1</b> with ArNCO [Ar = 2,6-<i>i</i>Pr<sub>2</sub>C<sub>6</sub>H<sub>3</sub>] affords the corresponding carbamoyl­(hydroxyl)­stannane <b>11</b> via the hydrolysis of the corresponding sila­aziridinone formed by the [1 + 2] cycloaddition reaction of <b>1</b> with the NC double bond of the isocyanate. Stannylene <b>1</b> reacts with ArNCS, giving a mixture of complex products, while <b>1</b> does not react with CO<sub>2</sub>. 2016-04-21 13:06:15 distanna ArN Carbon Disulfide isomeric mixture column chromatography Compounds 8 Stannylene 1 isolable dialkylstannylene 1 Lewis acid CO 2 reaction conditions NMR spectroscopy CS 2 DFT calculations Isolable Dialkylstannylene Related Heterocumulenes