74512-04-2

Basic information

• Product Name: Phosphine, bis(1,1-dimethylethyl)[(diphenylphosphino)methyl]-
• CAS NO: 74512-04-2
• Molecular Formula: C21H30P2
• Molecular Weight: 344.417
• Mol File: 74512-04-2.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: Phosphine, bis(1,1-dimethylethyl)[(diphenylphosphino)methyl]-(CAS DataBase Reference)
• NIST Chemistry Reference: Phosphine, bis(1,1-dimethylethyl)[(diphenylphosphino)methyl]-(74512-04-2)
• EPA Substance Registry System: Phosphine, bis(1,1-dimethylethyl)[(diphenylphosphino)methyl]-(74512-04-2)

Safety Data

• Hazardous Substances Data: 74512-04-2(Hazardous Substances Data)

Upstream product

• 13716-10-4 di(tert-butyl)chlorophosphine 
• 62263-69-8 (lithiomethyl)diphenylphosphane 
• 1079-66-9 chloro-diphenylphosphine 
• 64065-07-2 (lithiomethyl)bis(tert-butyl)phosphane 
• 6002-40-0 methyldi-t-butylphosphine 

Downstream Products

• 1352843-47-0 (t-Bu2PCH2PPh2-κ2P)NiCl2 
• 1352843-67-4 [(t-Bu2PCH2PPh2-κ2P)Ni(η3-benzyl)][B(3,5-(CF3)2C6H3)4] 
• 1352843-63-0 (t-Bu2PCH2PPh2-κ2P)Ni(benzyl)2 
• 74525-14-7 Tetracarbonyl(di-tert-butyl[(diphenylphosphino)methyl]phosphan-P,P')chrom⁽⁰⁾ 
• 89741-89-9 Tetracarbonyl(di-tert-butyl[(diphenylphosphino)methyl]phosphoniummethylid-α-C,ω-P)chrom(0) 
• 89741-85-5 Tetracarbonyl([(di-tert-butylphosphino)methyl]diphenylphosphoniummethylid-α-C,ω-P)chrom(0) 
• 318496-87-6 cis,trans-[Ru(Cl)2(CN-t-Bu)2[PPh₂CH₂P(t-Bu)2]] 
• 318496-79-6 mer-[Ru(Cl)(CN-t-Bu)3[PPh₂CH₂P(t-Bu)2]]Cl 
• 318496-79-6 mer-[Ru(Cl)(CN-t-Bu)3[PPh₂CH₂P(t-Bu)2]]Cl 

Relevant articles and documents

Sterically crowded diphosphinomethane ligands: Molecular structures, UV-photoelectron spectroscopy and a convenient general synthesis of tBu2PCH2PtBu2 and related species

A series of highly crowded symmetric and unsymmetric diphosphinomethanes R2PCH2PR′2, important ligands in transition metal chemistry and catalysis, namely tBu2PCH2ptBu2 (dtbpm, 11), Cy2PCH2PCy2 (dcpm, 2), tBu2PCH2PCy2 (ctbpm, 3), tBu2PCH2PiPr2 (iptbpm, 4) and tBu2PCH2PPh2 (ptbpm, 5), has been prepared in high yields, using a general and convenient route, which is described in detail for 1. Other than 4, which is a colourless liquid, these compounds are crystalline solids at room temperature. Their molecular structures have been determined by single crystal X-ray diffraction, along with that of the higher homologue of 1, tBu2CH2CH2tBu 2 (dtbpe, 6). The solid-state structures of the dioxide of 1, tBu2P(O)CH2P(O)tBu2 (7), and of two phosphonium cations derived from 1, protonated [tBu2P(H)CH2PtBu2] + (8+) and the chlorophosphonium ion [tBu2P(Cl)CH2PtBu2] + (9+), are also described and show a distinct structural influence of the tetracoordinate P centres. The gas phase UV-photoelectron spectra of the diphosphines 1-6 have been measured. Their first two ionisation potentials are found to be nearly degenerate and all are in the low energy range from 7.5 to 7.8 eV. Comparison with related mono- and bidentate phosphines demonstrates that 1-6 are excellent σ-donors towards metals, in accord with their known coordination chemistry. Molecular geometries and electronic structures of the diphosphine systems have been studied by quantum chemical calculations and are compared to experiment. Unlike standard semiempirical methods (AM1, PM3, MNDO), which give rather poor minimum structures and seem inadequate for such sterically crowded systems, ab initio calculations (RHF/6-31G**) predict molecular geometries with reasonable accuracy and reflect the observed trends in experimental ionisation potentials.