Coordination of Aniline to an (η1-Allenyl)iridium Complex Leading to Hydroanilination
摘要:
Formation of the N-arylated eta(3)-aza-TMM complexes of iridium from regioselective hydroanilination of an octahedral (eta(1)-allenyl)iridium complex has been studied. (OC-6-42)-Ir(Cl)(PPh(3))(2)(OTf)(CO)(eta(1)-CHCCH2) (2) undergoes the substitution of L (L = NH3, NH2NH2, MeNH(2), EtNH(2), (PrNH2)-Pr-i, PhCH(2)NH(2)) for the triflate ligand to yield {(OC-6-42)-Ir(Cl)(PPh(3))(2)-(L)(Co)(eta(1)-CHCCH2)}(OTf) (3d-i). In contrast, the reactions of 2 with XC(6)H(4)NH(2) (X = F, NO2, MeO, H, Me), Ph(2)NH, and Ph(Me)NH result in regioselective addition at the allenyl ligand, thereby generating the N-arylated eta(3)-aza-TMM complexes 5a-g. The mechanistic studies confirm that the hydroanilination is preceded by the formation of an aniline-ligated intermediate.
is suggested that nucleophilic addition of 1 likely involves external attack at the central carbon of the η3-allenyl/propargyl ligand. Protonation of 2b yields Pt(PPh3)2[η3-CH2C(PPh3)CH2]}(BF4)2 (7). Addition of PPh3 to a labile η1-allenyliridium complex, (OC-6-42)-Ir(Cl)(PPh3)2(OTf)(CO)(η1-CHCCH2) (4), results in the The single-crystal X-raystructure of 5 has been determined.
Reactivity of Octahedral η<sup>1</sup>-Allenyl Iridium toward Hard Nucleophiles
作者:Ray-Hsi Hsu、Jwu-Ting Chen、Gene-Hsiang Lee、Yu Wang
DOI:10.1021/om960261a
日期:1997.3.1
undergoes regioselective addition with water or alcohol at the allenyl central carbon to generate the (η3-2-hydroxyallyl) and (η3-2-alkoxyallyl)iridium complexes Ir(Cl)-(PPh3)2(CO)[η3-CH2C(OR)CH2]}(OTf) (R = H (3), Me (4a), Et (4b)), respectively. The complex 3 and the η3-oxa-TMM species Ir(Cl)(PPh3)2(CO)[η3-CH2C(O)CH2] (5) constitutes a conjugateacid−base pair. Hydrolysis of the η3-alkoxyallyl complexes
Coordination of Aniline to an (η<sup>1</sup>-Allenyl)iridium Complex Leading to Hydroanilination
作者:Jwu-Ting Chen、Yu-Kun Chen、Jiane-Bond Chu、Gene-Hsiang Lee、Yu Wang
DOI:10.1021/om9602623
日期:1997.4.1
Formation of the N-arylated eta(3)-aza-TMM complexes of iridium from regioselective hydroanilination of an octahedral (eta(1)-allenyl)iridium complex has been studied. (OC-6-42)-Ir(Cl)(PPh(3))(2)(OTf)(CO)(eta(1)-CHCCH2) (2) undergoes the substitution of L (L = NH3, NH2NH2, MeNH(2), EtNH(2), (PrNH2)-Pr-i, PhCH(2)NH(2)) for the triflate ligand to yield (OC-6-42)-Ir(Cl)(PPh(3))(2)-(L)(Co)(eta(1)-CHCCH2)}(OTf) (3d-i). In contrast, the reactions of 2 with XC(6)H(4)NH(2) (X = F, NO2, MeO, H, Me), Ph(2)NH, and Ph(Me)NH result in regioselective addition at the allenyl ligand, thereby generating the N-arylated eta(3)-aza-TMM complexes 5a-g. The mechanistic studies confirm that the hydroanilination is preceded by the formation of an aniline-ligated intermediate.