TpMe2Rh(C2H4)(PR3) (R = Me, Et) are also efficient reagents for the C−H bond activation of C6H6, py, or thiophene. In the latter case, rupture of the C−S bond is also detected, although the C−S bond activation complexes are thermodynamically disfavored with respect to those derived from the cleavage of one of the α-C−H bonds.
N供体路易斯碱(例如
乙腈或
吡啶)与Rh(I)化合物Tp Me 2 Rh(C 2 H 4)2(1)反应,得到Rh(III)衍
生物Tp Me 2 Rh(CH CH 2)( c ^ 2 ^ h 5)(L)(2,3)作为反应的动力学产品。在60℃加热后,
乙腈加合物2转化为Tp Me 2 Rh(C 2 H 4)(NCMe)(5)。在类似条件下,2如同位素标记研究所示,它能够在涉及1的中间过程中诱导C 6 H 6的C H键之一的活化。膦加合物Tp Me 2 Rh(C 2 H 4)(PR 3)(R = Me,Et)也是激活C 6 H 6,py或
噻吩的CH键的有效试剂。在后一种情况下,尽管相对于由α-CH键之一的裂解所衍生的那些键,CS键活化复合物在热力学上是不利的,但也检测到了CS键的断裂。