189756-42-1

Basic information

• Product Name: Phosphine, tris[3,5-bis(1,1-dimethylethyl)phenyl]-
• CAS NO: 189756-42-1
• Molecular Formula: C42H63P
• Mol File: 189756-42-1.mol
• Article Data: 6

Chemical Properties

• CAS DataBase Reference: Phosphine, tris[3,5-bis(1,1-dimethylethyl)phenyl]-(CAS DataBase Reference)
• NIST Chemistry Reference: Phosphine, tris[3,5-bis(1,1-dimethylethyl)phenyl]-(189756-42-1)
• EPA Substance Registry System: Phosphine, tris[3,5-bis(1,1-dimethylethyl)phenyl]-(189756-42-1)

Safety Data

• Hazardous Substances Data: 189756-42-1(Hazardous Substances Data)

Upstream product

• 22385-77-9 1-bromo-3,5-di-tert-butylbenzene 
• 1014-60-4 1,3-di-tert-butylbenzene 

Relevant articles and documents

Chemical and Electrochemical Oxidation of Tris(3,5-di-tert-butylphenyl)phosphine – High Z′ Crystal Structures and Conformational Effects Associated with Bulky meta Substituents

Synthesis and single-crystal X-ray diffraction structures of (3,5-tBu2-C6H3)3P, (3,5-tBu2-C6H3)3PO·H2O, (3,5-tBu2-C6H3)3PS and (3,5-tBu2-C6H3)3PSe are reported. The structure of (3,5-tBu2-C6H3)3P has Z′ = 4, with both M and P enantiomers of a helical conformation and a conformation with one flat ring in the same lattice. The pyramidality index, Σ{∠CPC}, is smaller for the helical compared to the flat conformers. All four have structures that are more pyramidal than the corresponding Ph3P(E) derivatives, which is attributed to stronger intramolecular dispersion forces. The oxide crystallizes with Z′ = 2 as a water-bridged dimer that is the most separated such dimer amongst 26 known structures, providing evidence for a distal (or perimeter) steric effect. Cyclic voltammetry in CH3CN/[nBu4N][ClO4] indicated anodic peak potentials of +0.785 V for (3,5-tBu2-C6H3)3P, +0.745 for (3,5-Me2-C6H3)3P, +0.735 V for (4-MeO-3,5-Me2-C6H2)3P and +0.535 V for (4-MeO-C6H4)3P, all relative to Fc+/0. On this scale, Ph3P oxidizes at +1.04 V. The unexpectedly high oxidation potentials for the first three phosphines is attributed to a more pyramidal structure resulting in lowering of the HOMO energy compared to expectations from Hammett constants and 1J(P,Se) NMR coupling constants.

Palladium-Catalyzed Diastereoselective Synthesis of (Z)-Conjugated Enynyl Homoallylic Alcohols

The diastereoselective synthesis of anti-homoallylic alcohols bearing conjugated (Z)-enynes through a palladium-catalyzed three-component reaction is described. This reaction features a broad substrate scope, good functional group compatibility, and high levels of (Z)-alkene stereocontrol. In this reaction, Pd(0) functions as a catalyst in two fundamental steps of the tandem sequence: 1) the generation of a borylated π-allylpalladium species from bifunctional conjunctive reagents, inducing umpolung allylation of aldehydes, and 2) C(sp2)?C(sp) cross-coupling. Further transformations of the obtained products highlight their synthetic utility. (Figure presented.).

METHOD FOR PREPARING SILAHYDROCARBONS

The present disclosure is directed to a process for preparing silahydrocarbons of formula (I), the process comprising the step of reacting a compound of formula (II), with a compound of formula (III), as well as to silahydrocarbons prepared by such a process, and to compositions and articles of manufacture comprising such silahydrocarbons.