The guanidine 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) and the substituted derivatives [TBD-SiR ] and TBD-BR reacted with SO to give different FLP-SO adducts. Molecular structures, elucidated by X-ray diffraction, showed some structural similarities with the analogous CO adducts. Thermodynamic stabilities were both experimentally evidenced and computed through DFT calculations. The underlying parameters governing the relative stabilities of the different SO and CO adducts were discussed from a theoretical standpoint, with a focus on the influence of the Lewis acidic moiety.
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