Résumé
ArPH
2 (Ar=[C
6H
3(CH
2NMe
2)
2-2,6])
3 undergoes hydride abstraction on treatment with trityl cation to give the stabilized phosphenium ion [ArPH]
+BF
4
−,
4a. The same cation was prepared by reaction of
3 with BrCCl
3 (
4b) and also by lithiation of
3 followed by treatment with I
2 (
4c). ArLi reacts with PX
3 (X = Cl or Br) to give the stabilized phosphenium ion [ArPX]
+X
− which affords
3 by LiAlH
4 reduction. In contrast, DIBAL-H reduction of [ArPX]
+X
− gives [ArPH]
+X
−. This last reaction constitutes a transformation of a stabilized and functionalized phosphenium ion into a different ion. Confirmation of the structure of these salts was given by single-crystal X-ray diffraction analysis of [ArPH]
+PF
6
−
4e.