Primary and secondary phosphine complexes of iron porphyrins and ruthenium phthalocyanine: synthesis, structure, and P-H bond functionalization

Reduction of Fe(III)(Por)Cl] (Por = porphyrinato dianion) with Na2S2O4 followed by reaction with excess PH2Ph, PH2Ad, or PHPh2 afforded Fe(II)(F20-TPP)(PH2Ph)2] (1a), Fe(II)(F20-TPP)(PH2Ad)2] (1b), Fe(II)(F20-TPP)(PHPh2)2] (2a), and Fe(II)(2,6-Cl2TPP)(PHPh2)2] (2b). Reaction of Ru(II)(Pc)(DMSO)2] (Pc = phthalocyaninato dianion) with PH2Ph or PHPh2 gave Ru(II)(Pc)(PH2Ph)2] (3a) and Ru(II)(Pc)(PHPh2)2] (4). Ru(II)(Pc)(PH2Ad)2] (3b) and Ru(II)(Pc)(PH2Bu(t))2] (3c) were isolated by treating a mixture of Ru(II)(Pc)(DMSO)2] and O=PCl2Ad or PCl2Bu(t) with LiAlH4. Hydrophosphination of CH2=CHR (R = CO2Et, CN) with Ru(II)(F20-TPP)(PH2Ph)2] or Ru(II)(F20-TPP)(PHPh2)2] in the presence of (t)BuOK led to the isolation of Ru(II)(F20-TPP)(P(CH2CH2R)2Ph)2] (R = CO2Et, 5a; CN, 5b) and Ru(II)(F20-TPP)(P(CH2CH2R)Ph2)2] (R = CO2Et, 6a; CN, 6b). Similar reaction of 3a with CH2=CHCN or MeI gave Ru(II)(Pc)(P(CH2CH2CN)2Ph)2] (7) or Ru(II)(Pc)(PMe2Ph)2] (8). The reactions of 4 with CH2=CHR (R = CO2Et, CN, C(O)Me, P(O)(OEt)2, S(O)2Ph), CH2=C(Me)CO2Me, CH(CO2Me)=CHCO2Me, MeI, BnCl, and RBr (R = (n)Bu, CH2=CHCH2, MeCtriple bond]CCH2, HCtriple bond]CCH2) in the presence of (t)BuOK afforded Ru(II)(Pc)(P(CH2CH2R)Ph2)2] (R = CO2Et, 9a; CN, 9b; C(O)Me, 9c; P(O)(OEt)2, 9d; S(O)2Ph, 9e), Ru(II)(Pc)(P(CH2CH(Me)CO2Me)Ph2)2] (9f), Ru(II)(Pc)(P(CH(CO2Me)CH2CO2Me)Ph2)2] (9g), and Ru(II)(Pc)(PRPh2)2] (R = Me, 10a; Bu(n), 10b; Bn, 10c; CH2CH=CH2, 10d; CH2Ctriple bond]CMe, 10e; CH=C=CH2, 10f). X-ray crystal structure determinations revealed Fe-P distances of 2.2597(9) (1a) and 2.309(2) A (2bx 2 CH2Cl2) and Ru-P distances of 2.3707(13) (3b), 2.373(2) (3c), 2.3478(11) (4), and 2.3754(10) A (5b x 2 CH2Cl2). Both the crystal structures of 3b and 4 feature intermolecular C-H...pi interactions, which link the molecules into 3D and 2D networks, respectively.