Effects of phosphine substituents on CO and norbornene insertion rates into (P,N)–Pd–alkyl and –acyl bonds
作者： Peter H.P. Brinkmann , Gerrit A. Luinstra
DOI: 10.1016/S0022-328X(98)00953-X
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摘要: Abstract The synthesis is described of (P,N)–PdMe(X) (P,N=R 2 P- o -C 6 H 4 CH NMe ( L1 ), Me N- –PR L2 1-(dimethylamino)-8-(R phosphino)naphthalene L3 ) with R =Ph a Cy b Me,Ph c , for only); X=Cl, OTf) and cationic (P,N)–PdMe(L) + (L, MeCN, CO; anion, − B[3,5-Ph–(CF 3 ] ). complexes react CO to give (P,N)–Pd{C(O)Me}(X/L derivatives. Carbonylation faster in the more basic phosphines type 1 but slower ligand . Norbornene inserts slowly into (P,N)–Pd–acetyl bond borate – OTf. Cationic palladium phenyl substituted phosphine ligands are reactive toward CO/norbornene mixtures than those cyclohexyl that observed reactivity terms differences insertion rates rate determining isomerization or trapping by norbornene intermediates, trans -P (P,N)–Pd{C(O)Me} complexes.
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