12128-53-9Relevant academic research and scientific papers
W(CO)3(PMTA) (PMTA = MeN(CH2CH2NMe2)2) as a starting material for syntheses of W(CO)3(PR3)3, W(CO)3(η6-arene), and the protonated W(H)(CO)3(PR3)3+ complexes
Zanotti, Valerio,Rutar, V.,Angelici, Robert J.
, p. 177 - 191 (2007/10/02)
A new and improved method for the synthesis of M(CO)3(PMTA) (M = W, Mo) from M(CO)6 and PMTA (MeN(CH2CH2NMe2)2) is described.The tridentate nitrogen ligand in W(CO)3(PMTA) is replaced, under relatively mild conditions, by tertiary phosphines (PMe3, PEt3, PMe2Ph, PMePh2, PhP(CH2CH2PPh2)2, CH3C(CH2PPh2)3, and Ph2P(CH2)nPPh2 where n = 1, 2) and arenes (C6H6, MeC6H5, p-Me2C6H4, C6Me6, C6H5Cl), which provides a general synthetic method for the preparation of W(CO)3(PR3)3 and W(CO)3(η6-arene) complexes.The reactions of W(CO)3(L)3 with CF3SO3H in CH2Cl2 solution yield the hydrido derivatives W(H)(CO)3(L)3+ which were characterized by their 1H and 31P NMR spectra at different temperatures.These studies show the W(H)(CO)3(L)3+ complexes to be fluxional as a result of both hydride and phosphine ligand migration.
A new, general route to (μ-bis(carbene))ditungsten complexes: X-ray crystal structure of (CO)5W{C(OCH3)CH2[CH(CH2) 3C(CH2CH=CH2)]C-(OCH3)}W(CO) 5
Macomber, David W.,Hung, Mu-Huang,Verma, Akhilkumar G.,Rogers, Robin D.
, p. 2072 - 2074 (2008/10/08)
α-Lithio carbene anions (CO)5W[C(OCH3)-CR1R2] -Li+ (2) react with α,β-unsaturated carbene complexes (CO)5W[C(OCH3)C(R4)=CHR3] (3) to produce the intermediate α-lithio (μ-bis(carbene))ditungsten anions (CO)5W[C(OCH3)C(R1)(R2)CH(R 3)C(R4)C(OCH3)]W(CO)5 -Li+ (4), which were subsequently quenched with electrophilic reagents (E-X = CH3OSO2CF3, CH2=CHCH2Br, PhCH2Br, Me3SiCl, HCl) to afford good yields of the desired (μ-bis-(carbene))ditungsten complexes (CO)5W[C(OCH3)C-(R1)(R2)CH(R 3)C(R4)(R5)C(OCH3)]W(CO)5 (5). Complex 5j (R1 = R2 = H; R3, R4 = (-CH2-)3; R5 = CH2CH=CH2), which was the only diastereomer formed, was characterized by X-ray crystallography and showed the two large tungsten carbene fragments to be on the same side of the cyclopentane ring.
