摘要:
Treatment of [Li{HC(PPh2NSiMe3)(2)}](2) with 2 equiv of [MOR] (M = Rb, Cs; OR = 2-ethylhexoxide) afforded the heavy group 1 methanides [Rb{HC(PPh2NSiMe3)(2)} (THF)(2)] (1) and [Cs{HC(PPh2NSiMe3)(2)}(DME)(2)] (2), which do not exhibit methanide C center dot center dot center dot M contacts in the solid state. Following a literature procedure, H2C(PPh2)(2) was reacted with 2 equiv of AdN(3) (Ad = adamantyl) to give H2C(PPh(2)NAd)(2) (3). Reaction of 3 with 1 equiv of (BuLi)-Li-t in toluene afforded dimeric [Li{HC(PPh(2)NAd)(2)}](2) (4). Treatment of 3 with 1 equiv of [M(Bn)] (M = Na, K; Bn = CH2C6H5) in THF gave the Lewis base adducts [M{HC(PPh(2)NAd)(2)}(THF)(2)] [M = Na (5), K (6)]. The heavy group 1 methanides [Rb{HC(PPh(2)NAd)(2)}(THF)(2)] (7) and [Cs{HC(PPh(2)NAd)(2)}(DME)(2)] (8) were prepared by the reaction of [MOR] (M = Rb, Cs; OR = 2-ethylhexoxide) with 4 or reaction of [Cs(Bn)] with 3. The synthetic utility of these group 1 transfer agents has been demonstrated by the preparation of [La{HC(PPh2NR)(2)}(I)(2)(THF)] [R = SiMe3 (9), Ad (10)] from [La(I)(3)(THF)(4)], employing a salt metathesis methodology. Complexes 1-10 have been characterized by X-ray crystallography, multielement NMR spectroscopy, FTIR spectroscopy, and CHN microanalyses.