177342-86-8

Upstream product

• 16853-85-3 lithium aluminium tetrahydride 
• 1663-45-2 1,2-bis-(diphenylphosphino)ethane 

Downstream Products

• 188491-40-9 [(C₅(CH₃)5)MoH₄((CH₂P(C₆H₅)2)2)]⁽¹⁺⁾ 
• 188491-47-6 ((CH₃)5C₅)Mo(H)2(((C₆H₅)2PCH₂)2)(CH₃CN)⁽¹⁺⁾*BF₄^(1-)=[((CH₃)5C₅)Mo(H)2(((C₆H₅)2PCH₂)2)(CH₃CN)]BF₄ 
• 188491-41-0 ((CH₃)5C₅)Mo(H)4(((C₆H₅)2PCH₂)2)⁽¹⁺⁾*BF₄^(1-)=[((CH₃)5C₅)Mo(H)4(((C₆H₅)2PCH₂)2)]BF₄ 
• 265122-91-6 (η5-pentamethylcyclopentadienyl)bis(hydroxido)(1,2-bis(diphenylphosphino)ethane)molybdenum 
• 1010693-66-9 (Cp*)(1,2-bis(diphenylphosphanyl)ethane)dihydridomolybdenum(IV)(trifluoroacetato) 
• 1010693-68-1 (Cp*)(1-1,2-bis(diphenylphosphanyl)ethane)dihydridomolybdenum(IV)(THF) 
• 221341-72-6 [Cp*Mo(H)(THF)(dppe)] 
• 188491-46-5 [Cp*Mo(H)2(MeCN)(dppe)]⁽¹⁺⁾ 
• 188550-32-5 [Cp*Mo(H)(MeCN)2(dppe)]⁽²⁺⁾ 
• 204858-72-0 [Cp*Mo(H)3(dppe)]PF₆ 

Relevant academic research and scientific papers

Synthesis, structure, and protonation studies of Cp*MH3(dppe) (M = Mo, W). Pseudo-trigonal-prismatic vs pseudo-octahedral structures for half-sandwich group 6 M(IV) derivatives

The compounds Cp*MH3(dppe) (M = Mo, 1; W, 2) are accessible in good yields from reacting the corresponding compound Cp*MCl4 and LiAlH4 in toluene/Et2O followed by methanolysis. The X-ray structure of 1 shows a pseudo-trigonal-prismatic geometry which is unprecedented for half-sandwich CpML5-type compounds. Protonation with HBF4·Et2O in Et2O at low temperature affords [Cp*MH4(dppe)]+BF4- salts (M = Mo, 3; W, 4). While 3 spontaneously decomposes, even at low temperatures, in coordinating solvents and CH2Cl2, 4 is stable at room temperature in MeCN. An X-ray structure of 4 is consistent with a classical tetrahydrido species with a distorted pseudo-pentagonal-bipyramidal structure. The low-temperature NMR properties, JHD ≤ 1 Hz for 4-d3, and the T1(min) value for the hydride resonance are also consistent with this structural assignment. Decomposition of 3 in MeCN at room temperature selectively affords [Cp*M0H2(MeCN)(dppe)]+BF4-, 5. The NMR properties of this complex indicate a fluxional structure with inequivalent H and P nuclei and are consistent with a pseudo-trigonal-prismatic structure analogous to that of the precursor 1. Further protonation of 5 in MeCN or direct protonation of 1 with excess acid in MeCN affords two isomers of complex [Cp*MoH(MeCN)2(dppe)](BF4)2, 6 and 7. Thermal treatment in MeCN slowly converts 7 into 6 initially, but both isomers further transform into a third isomer, 8, upon prolonged heating. The structure of 6 has been elucidated by X-ray crystallography and consists of a highly distorted pseudo-octahedral geometry with relative trans MeCN ligands. The structures of 7 and 8 and mechanisms of the interconversions between the various isomeric structures are proposed on the basis of the solution NMR studies.