26076-12-0

Basic information

• Product Name: (p-Tol)6Pb₂
• CAS NO: 26076-12-0
• Molecular Weight: 961.195
• Mol File: 26076-12-0.mol

Chemical Properties

• CAS DataBase Reference: (p-Tol)6Pb₂(CAS DataBase Reference)
• NIST Chemistry Reference: (p-Tol)6Pb₂(26076-12-0)
• EPA Substance Registry System: (p-Tol)6Pb₂(26076-12-0)

Safety Data

• Hazardous Substances Data: 26076-12-0(Hazardous Substances Data)

Upstream product

• 4294-57-9 para-methylphenylmagnesium bromide 
• 100162-42-3 (C₆H₁₁)3PbLi 
• 104026-67-7 (C₆H₄CH₃)3PbCl 

Downstream Products

• 72082-17-8 bis(tri-p-tolyllead) sulphide 
• 3910-39-2 tris(pentafluorophenyl)antimony 
• 106112-82-7 tri-p-tolyl-lead cyanide 
• 1718-45-2 tetra-p-tolylplumbane 
• 117486-62-1 benzyl-tri-p-tolyl plumbane 

Relevant articles and documents

On mixed group 14-group 14 bonds. 8. Asymmetrically substituted compounds Ar3Pb-GeAr′3 and Ar3Pb-PbAr′3: Comparison of structure and physical behavior in the series of bonds Sn-Sn, Pb-Ge, Pb-Sn, and Pb-Pb

A general procedure for the synthesis of hezaarylated compounds of the type Ar3PbGeAr′3 from Ar3PbLi and Ar′3GeX in THF/ether at -60°C is given. Likewise, from Ar3PbLi and Ar′PbI the asymmetrical diplumbanes Ar3PbPbAr′3 could be prepared. By the use of the bulky groups Ar and Ar′, the migration of aryl groups could be suppressed, avoiding the appearance of the mixtures Pb2Ar6-nAr′n (n = 0-6). Nonetheless, the resulting diplumbanes Ar3Pb-PbAr′3 were always partially contaminated with some symmetric Pb2Ar6 and Pb2Ar′6. The structures of (p-Tol)3PbGePh8 (triclinic, space group P1; a = 9.983(1) b = 12.201(1) c = 15.728(2) A?; α = 95.73(1), β = 103.56(1), γ = 113.06(1)°; V = 1674(1) A?3; Z = 2; R = 0.0434) and (p-Tol)3PbGe-(p-Tol)3 (trigonal, space group R3; a - 13.338(1), c = 36.55(1) A?; V = 5631(2) A?3; Z = 6; R = 0.0522) have been determined. NMR chemical shifts δ(119Sn) and δ(207Pb) (40 compounds) and one-bond couplings 1J(M-M′) (16 compounds), stretching vibrations ν(M-M′) and force constants f(M-M′) for a diatomic oscillator (38 compounds), and bond distances d(M-M′) (18 compounds) are compared for all six combinations M/M′ = Ge/Sn/Pb of Ar3M-M′Ar′3. Concerning the asymmetric diplumbanes Ar3Pb-PbAr′3, assignments of δ(207Pb) resulted from a consideration of inductivity (comparison to PbAr4/Ar′4) and an assumed order of charge flow Δ(Ar ? Ar′) (13 compounds). Sequences exist for δ(119Sn) (Pb-Sn > Sn-Sn ≥ Sn-Ge), δ(207Pb) (Pb-Pb > Pb-Sn ≈ Pb-Ge), f (Sn-Ge > Sn-Sn ≥ Pb-Sn, and Pb-Ge > Pb-Sn ≥ Pb-Pb), d (Sn-Ge ≤ Pb-Ge 1K (Pb-Sn > Sn-Sn > Pb-Pb scatter ). The polarities Pbδ--Geδ+and Pbδ- - Snδ+ are obvious. The enhanced electronegativity of lead demonstrates the influence of its relativistically contracted 6s and 6p orbitals. With regard to Ar3Pb-PbAr′3, a relation between 1K(Pb-Pb) and the charge flow Δ(Ar ? Ar′) is indicated.

UEBER POLYPLUMBANE. I. ASYMMETRISCH SUBSTITUIERTE DIPLUMBANE

Diplumbanes Pb2R3R'3 (R,R'=Ph, o-Tol, p-Tol) have been synthesized from R3PbLi and R'PbCl at -60 deg C in THF.Mass, 13C and 207Pb NMR spectra of the products exhibit migrations of R, R' in the transition state (R3PbLi + ClPbR'3) leading to a complex distribution of the substituents (δ(207Pb) with respect to PbMe4 -70 to -95 ppm).The Pb-Pb stretching vibration (100 to 115 cm-1) couples with a lattice vibration giving rise to a single intensive Raman line.The crystal structure of Pb2Ph3(p-Tol)3 has been determined and refined to R=0.155.Two independent molecules are disordered and have identical distribution of the substituents Ph(p-Tol)2Pb-PbPh2(p-Tol) (distances Pb-Pb 283(2) and 286(1) pm).Products Pb2Ph3(OAc)3 with a Pb-Pb bond, already discussed in the literature, could not be verified.