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Journal articles
Reactivity and Structural Diversity in the Reaction of Guanidine 1,5,7-Triazabicyclo[4.4.0]dec-5-ene with CO 2 , CS 2 , and Other Heterocumulenes
Abstract : The guanidine 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) reacted with the heterocumulenes CO2, CS2, iPr2NCNiPr2, ptolylNCO and ptolylNCS to give three types of products: TBD-CO2 (1) and TBD-ptolylNCS (5), resulting from addition of the cumulene to TBD, TBD(-H)({iPrNH}-C=N{iPr}) (3) and TBD(-H)(ptolylNHCO) (4), resulting from addition of the N-H bond of TBD to the C=N bond of the cumulene, and dithiocarbamate salt [TBDH][TBD(-H)CS2] (2) after transfer of a proton to a second molecule of TBD. Competition reactions indicated that the order of decreasing stability of the compounds is: 4 > 5 > 1 > 2 > 3. DFT calculations showed that the relative stabilities of the products are governed by both the Lewis acidity of the heterocumulene and the Brønsted basicity of the TBD(-H)-cumulene anion, while their distinct structures are determined by the latter, with the most basic site governing the geometry of the final product.
Cited literature [6 references]
https://hal-cea.archives-ouvertes.fr/cea-01447886
Contributor : Serge Palacin <>
Submitted on : Friday, January 27, 2017 - 12:24:53 PM
Last modification on : Thursday, July 1, 2021 - 4:45:07 PM
Long-term archiving on: : Friday, April 28, 2017 - 3:33:00 PM
Contributor : Serge Palacin <>
Submitted on : Friday, January 27, 2017 - 12:24:53 PM
Last modification on : Thursday, July 1, 2021 - 4:45:07 PM
Long-term archiving on: : Friday, April 28, 2017 - 3:33:00 PM
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