86280-10-6

Upstream product

• 75-09-2 dichloromethane 
• 86280-11-7 Lithium-bis(2,4,6-trimethylphenyl)phosphid 

Downstream Products

• 167110-09-0 Pt(O₂CCF₃)2((((CH₃)3C₆H₂)2P)2CH₂) 
• 167110-03-4 Pt(Cl)2((((CH₃)3C₆H₂)2P)2CH₂) 
• 86314-34-3 C₃₀H₄₀P₂⁽²⁺⁾*2Cl^(1-) 
• 86314-32-1 1,1,3,3,3,4-Hexahydro-2,3-didehydro-1,3,6,8-tetramethyl-1,3-bis(2,4,6-trimethylphenyl)-1,3-benzodiphosphorin 
• 86280-12-8 methylenebis(methyldimesitylphosphonium iodide) 

Relevant academic research and scientific papers

POLYMERISATION PROCESS CATALYSED BY A BIDENTATE BISPHOSPHINE-GROUP VIII METAL COMPLEX

A process for the polymerization and copolymerization of olefins is disclosed, comprising contacting the monomeric olefin under polymerization conditions with a polymerization catalyst or catalyst system which comprises (a) a source of a Group VIII metal; (b) a bidentate phosphine ligand having the formula (R1)(R1)P-X-P(R1)(R1), where each R1 is independently selected from a phenyl group or a substitued phenyl group with the proviso that at least one of the R1 groups is a phenyl group having at least one ortho substituent, and X is a bridging group of the structure -[N]x-[P]y-[N]- where x and y are independently 0 or 1, or -C(R4)2- where R4 may be the same or different and is hydrogen or a monovavlent hydrocarbyl, substituted hydrocarbyl or hetero-hydrocarbyl group; and optionally (c) a promoter.

Rearrangements of the Methyltrimesitylphosphonium and Methylenebis(methyldimesitylphosphonium) Cation Skeletons on Treatment with Base

The treatment of methyltrimesitylphosphonium iodide (1) with sodium amide or butyllithium leads neither to the corresponding phosphorus ylide nor to the product of a Stevens rearrangement, but affords instead methylmesitylphosphane (4).The product, which is probably formed via a mesityl migration in an 2-methylenecyclohexadienylidenephosphorane intermediate (2b), is structurally characterized by detailed NMR analysis and through hydrochloride and methoiodide derivatives. - Analogous treatment of methylenebis(methyldimesitylphosphonium iodide) (10) with base leads to a pair of diastereomeric cyclic carbodiphosphoranes (12a, b), with elimination of mesitylene.The two carbodiphosphoranes are converted into the diastereomeric diphosphonium salts 13a, b with HCl.The ring closure leading to carbodiphosphorane formation is again interpreted in terms of an intramolecular process involving an 2-methylenecyclohexadienylidene intermediate.Deprotonation of the methylenebis(methyldi-o-tolylphosphonium) cation yields the corresponding carbodiphosphorane 18 without changes in the skeleton.