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- W2165617684 abstract "Condensation of Z-PPh2CH2C(tBu)NNH2 with 2-halobenzaldehydes gave mixed azines of the type ZE-PPh2CH2C (tBu)NNCH(C6H4X-2) (X = I, 2a; Br, 2b; Cl, 2c; or F, 2e, respectively). 2a, 2b, or 2c reacted with fac-[W(CO)3(NCEt)3] to give tungsten(0) complexes [W(CO)3(NCEt){PPh2CH2C(tBu) NNCH(C6H4X-2)}] (3a–3c), which rapidly underwent oxidative addition to give seven-coordinate tungsten(II) complexes of the type [WX(CO)3{PPh2CH2C(tBu)NNCH(C6H4)}] (4a–4c). The fluoro- mixed azine Ph2PCH2C(tBu)NNCH(C6H4F-2) (2e) with fac-[W(CO)3(NCEt)3] gave [W (CO)3(NCEt){PPh2CH2C(tBu)NNCH(C6H4F-2)}] (3e) which did not undergo CF oxidative addition, but when treated with CO or CNtBu gave tungsten(0) complexes of the type [W(CO)3L{PPh2CH2C(tBu)NCH(C6H4F-2)}] (L = CO, 5a or CNtBu, 5b). The mixed azine from 2-chloro-6-fluorobenzaldehyde and 1 i.e. PPh2CH2C(tBu)NNCH(C6H3Cl-2,-F-6) (2d) with fac-[W(CO)3(NCEt)3] underwent oxidative addition at the CCl bond to give [WCl(CO)3{PPh2CH2C(tBu) NNCH(C6H3F-6)}] (4d) via a tungsten(0) complex 3d. Treatment of the aryl-tungsten(II) complex [WBr(CO)3{PPh2CH2C(tBu)NNCH(C6H4)}] (4b) with NaBH4/CO caused aryltungsten bond fission (reductive elimination) and CN reduction to give the benzylhydrazone-phosphine complex [W(CO)4{PPh2CH2 C(tBu)NNHCH2Ph}] (6) which was also formed by reducing the benzaldehyde mixed azine phosphine tungsten(0) complex [W(CO)4{PPh2CH2C(tBu)NNCHPh}] (8) with NaBH4." @default.
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- W2165617684 title "Cyclometallation of 2-halogenobenzaldehyde mixed azine phosphines of type PPh2CH2C(tBu)NNCH(C6H4X- 2) (X = I, Br or Cl) involving facile CX bond fission at tungsten(0)" @default.
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- W2165617684 doi "https://doi.org/10.1016/0022-328x(94)84098-9" @default.
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