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

Niklas von Wolff 1 Claude Villiers 1 Pierre Thuéry 1 Guillaume Lefèvre 1 Michel Ephritikhine 1 Thibault Cantat 1
1 LCMCE - Laboratoire de Chimie Moléculaire et de Catalyse pour l'Energie (ex LCCEF)
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
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.
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Niklas von Wolff, Claude Villiers, Pierre Thuéry, Guillaume Lefèvre, Michel Ephritikhine, et al.. 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. European Journal of Organic Chemistry, Wiley-VCH Verlag, 2017, 2017, pp.676-686. ⟨10.1002/ejoc.201601267⟩. ⟨cea-01447886⟩

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