A novel diamine ligand containing a simple thiophene ring in the backbone has been synthesized. Substitution at the nitrogen atoms with either 2,4,6-trimethylphenyl (Mes) or 2,6-diisopropylphenyl (Dipp) was varied via a condensation reaction between the corresponding aniline and 3,4-diformylthiophene, giving two different ligand derivatives. In onwards chemistry that targeted the cyclic diaminochlorophosphines, the substitution at phosphorus was dependent on the ligand used. For example, when a stoichiometric reaction between PCl 3 and thiophene-3,4 diyldimethaneamine (R = Mes) was carried out, the synthesis of a bis-substituted diphosphino-product was isolated. If the R = Dipp ligand derivative was employed, both a 2:1 and 1:1 stoichiometric reaction between PCl 3 and the diamine was observed. Nevertheless, the cyclic diaminochlorophosphine (i.e., 1:1 stoichiometry) for R = Dipp was isolated in high yields and the synthesis of the corresponding phosphenium cation was achieved and structurally characterized.Résumé : On a synthétisé un nouveau ligand diamine dont le squelette contient un noyau thiophène simple. On a procédé à la substitution d'un groupe 2,4,6-triméthylphényle (Mes) ou d'un groupe 2,6-diisopropylphényle (Dipp) sur les atomes d'azote par une réaction de condensation entre l'aniline correspondante et le 3,4-diformylthiophène pour obtenir deux dérivés différents du ligand. Lors de réactions chimiques ultérieures ayant pour cible les diaminochlorophosphines cycliques, la substitution sur le phosphore dépendait du ligand utilisé. Par exemple, une réaction stoechiométrique entre PCl3 et la thiophène-3, 4 diyldiméthanamine (R = Mes) a donné la synthèse d'un produit diphosphiné bisubstitué. Lorsqu'on a employé le dérivé R = Dipp du ligand, on a observé une réaction de stoechiométrie 2:1 ainsi qu'une réaction de stoechiométrie 1:1 entre PCl3 et la diamine. Néanmoins, on a isolé avec un haut rendement la diaminochlorophosphine cyclique (c. à d. stoechiométrie 1:1) obtenue pour R = Dipp, et on a synthétisé le cation phosphénium correspondant et caractérisé sa structure. [Traduit par la Rédaction]
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