yield under mild conditions the type 2 cycles C6(CN)4R1R2R3R4 and the corresponding palladium(0) olefin derivative [Pd(η2]-TCNE)(LL′)]. The olefin insertion reactions are usually fast, but in the case of the reaction of complex 1Da with TCNE accumulation of an intermediate is observed. The low temperature NOESY spectrum allows the determination of the intermediate structure which can be described as
类型1 [Pd(LL')(C 4 R 1 R 2 R 3 R 4)]的
钯(II)衍
生物(LL'= HN
SPh:2-(苯
硫甲基)-
吡啶(A),BiPy:2, 2′-联
吡啶基(B),
DPPE:双-
二苯基膦基乙烷(C),N
EOC:新
铜pro(2,2′-二甲基-邻
菲咯啉)(D),R 1 = R 4 = COOMe,R 2,R 3 = C 10 H 6(a),R 1 = R 3 = C 6 H 5,R2 = R 4 = COOMe(b),R 1 = R 2 = R 3 = R 4 = COOMe(c))与弱电子烯烃
四氰基乙烯(TCNE)反应,在温和条件下产生2型循环C 6(CN )4 - [R 1 - [R 2 - [R 3 - [R 4和相应的
钯(0)烯烃衍
生物[
钯(η 2 ] -TCNE)(L-L')。烯烃的插入反应通常很快,但是在1Da络合物的情况下观察到具有TCNE的中