The titanium tert-butyl imido compounds
 [Ti(NBu
   t
 )Cl
   2
 (NC
   5
 H
   4
 R-4)
   
 n
 ] (R = H, n = 2 or 3;
 R = Bu
   t
 , n = 2) have been
 found to be entry points to the half-sandwich
 η
   5
 -cyclopentadienyl derivatives
 [Ti(η
   5
 -C
   5
 R′
   4
 R″)(NBu
   t
 
 )Cl(NC
   5
 H
   4
 R-4)]
 (R = Bu
   t
 ,
 R′ = R″ = H or Me;
 R = H, R′ = H,
 R″ = H, Me or Pr
   i
 ; R = H,
 R′ = Me, R″ = Me, Et or
 C
   4
 H
   7
 ), the η
   5
 -1,2,3-trimethylindenyl
 species
 [Ti(η
   5
 -C
   9
 H
   4
 Me
   3
 )(NBu
   t
 
 )Cl(NC
   5
 H
   4
 Bu
   t
 -4)] and the
 bis(η
   5
 -cyclopentadienyl) compound
 [Ti(η
   5
 -C
   5
 H
   5
 )
   2
 (NBu
   t
 
 )(NC
   5
 H
   5
 )], the crystal structure of which has
 been determined. The complex
 [Ti(η
   5
 -C
   5
 H
   5
 )(NBu
   t
 )Cl(NC
 
   5
 H
   5
 )] readily loses pyridine under vacuum in the
 solid state to form the binuclear complex
 [Ti
   2
 (η
   5
 -C
   5
 H
   5
 )
   2
 (
 µ-NBu
   t
 )
   2
 Cl
   2
 ]. Treatment of
 [Ti(η
   5
 -C
   5
 Me
   4
 R)(NBu
   t
 )Cl(NC
 
   5
 H
   5
 )] (R = Me or Et) with
 Na[C
   5
 H
   5
 ] gives the corresponding mixed-ring sandwich
 derivatives
 [Ti(η
   5
 -C
   5
 H
   5
 )(η
   5
 -C
 
   5
 Me
   4
 R)(NBu
   t
 )Cl(NC
   5
 H
   5
 
 )]. Addition of Li[C
   9
 H
   7
 ] to
 [Ti(η
   5
 -C
   5
 H
   5
 )(NBu
   t
 )Cl(NC
 
   5
 H
   5
 )] gave the η
   5
 -cyclopentadienyl,
 η
   3
 -indenyl mixed-ring analogue
 [Ti(η
   5
 -C
   5
 H
   5
 )(η
   3
 -C
 
   9
 H
   7
 )(NBu
   t
 )(NC
   5
 H
   5
 )].
 The complex
 [Ti(η
   5
 -C
   5
 H
   5
 )
   2
 (NBu
   t
 
 )(NC
   5
 H
   5
 )] undergoes a room-temperature
 cyclopentadienyl ligand-redistribution reaction with
 [Ti(NBu
   t
 )Cl
   2
 (NC
   5
 H
   5
 )
   2
 
 ] forming
 [Ti(η
   5
 -C
   5
 H
   5
 )(NBu
   t
 )Cl(NC
 
   5
 H
   5
 )] in quantitative yield. Variable-temperature NMR
 spectra for the half-sandwich complexes show that the co-ordinated pyridine
 exchanges with free pyridine via an associative mechanism. The
 compound
 [Ti(η
   5
 -C
   5
 H
   5
 )(η
   5
 -C
 
   5
 Me
   4
 Et)(NBu
   t
 )(NC
   5
 H
   5
 
 )] is also fluxional and exhibits reversible pyridine dissociation at
 higher temperatures and restricted rotation about the Ti–N
 (pyridine) bond at lower temperatures.
                                    叔丁基亚
氨基
钛化合物 [Ti(NBu t)Cl 2 (NC 5 H 4 R-4) n ](R = H,n = 2 或 3;
 R = Bu t ,n = 2)已被发现是半夹心η 5 -
环戊二烯基衍
生物[Ti(η 5 -C 5 R′ 4 R″)(NBu t )Cl(NC 5 H 4 R-4)] (R = Bu t ,R′ = R″ = H 或 Me ;R = H ,R′ = H ,R″ = H ,Me 或 Pr i ;R=H,R′=Me,R″=Me,Et 或 C 4 H 7)、η 5 -1,2,3-三甲基
茚基化合物[Ti(η 5 -C 9 H 4 Me 3 )(NBu t )Cl(NC 5 H 4 Bu t -4)]和双(η 5 -
环戊二烯基)化合物[Ti(η 5 -C 5 H 5 ) 2 (NBu t )(NC 5 H 5 )],其晶体结构已经确定。复合物 [Ti(η 5 -C 5 H 5 )(NBu t )Cl(NC 5 H 5 )] 在固态真空下很容易失去
吡啶,形成双核复合物 [Ti 2 (η 5 -C 5 H 5 ) 2 ( µ-NBu t ) 2 Cl 2 ]。用 Na[C 5 H 5 ]处理[Ti(η 5 -C 5 Me 4 R)(NBu t )Cl(NC 5 H 5 )] (R = Me 或 Et),可得到相应的混环夹心衍
生物[Ti(η 5 -C 5 H 5 )(η 5 -C 5 Me 4 R)(NBu t )Cl(NC 5 H 5 )]。在[Ti(η 5 -C 5 H 5 )(NBu t )Cl(NC 5 H 5 )] 中加入 Li[C 9 H 7 ],可得到 η 5 -
环戊二烯基、η 3 -
茚基混合环类似物[Ti(η 5 -C 5 H 5 )(η 3 -C 9 H 7 )(NBu t )(NC 5 H 5 )]。
 复合物 [Ti(η 5 -C 5 H 5 ) 2 (NBu t )(NC 5 H 5 )] 与 [Ti(NBu t )Cl 2 (NC 5 H 5 ) 2 ] 发生室温
环戊二烯配体再分布反应,形成 [Ti(η 5 -C 5 H 5 )(NBu t )Cl(NC 5 H 5 )] 复合物,产量定量。半夹心复合物的变温核磁共振光谱显示,配位
吡啶与游离
吡啶通过缔合机制发生交换。化合物[Ti(η 5 -C 5 H 5 )(η 5 -C 5 Me 4 Et)(NBu t )(NC 5 H 5 )]也具有通性,在较高温度下表现出可逆的
吡啶解离,在较低温度下表现出围绕 Ti-N (
吡啶)键的受限旋转。