139705-61-6

Basic information

• Product Name: Phosphine, [(trimethylsilyl)methylene]bis[dimethyl-
• CAS NO: 139705-61-6
• Molecular Formula: C8H22P2Si
• Molecular Weight: 208.296
• Mol File: 139705-61-6.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: Phosphine, [(trimethylsilyl)methylene]bis[dimethyl-(CAS DataBase Reference)
• NIST Chemistry Reference: Phosphine, [(trimethylsilyl)methylene]bis[dimethyl-(139705-61-6)
• EPA Substance Registry System: Phosphine, [(trimethylsilyl)methylene]bis[dimethyl-(139705-61-6)

Safety Data

• Hazardous Substances Data: 139705-61-6(Hazardous Substances Data)

Upstream product

• 102493-28-7 lthium[bis(dimethylphosphanyl)(trimethylsilyl)methanide] 
• 98-13-5 Phenyltrichlorosilane 

Relevant articles and documents

Tetra-Heteroelement Substituted Methanes and Isomeric Phosphorus Ylides: C-versus P-Nucleophilicity of Ambidentate Phosphinomethanides

Fully heteroelement substituted carbanions, i.e. phosphinomethanides of the type (1-) (X, Y = PMe2, SiMe3) react with organoelement chlorides (X-Cl, Y-Cl) to give tetra-heteroelement substituted methanes and/or isomeric phosphorous ylides with an element-phosphorus bond.The latter in some cases are rigid, in others fluctional and in certain cases may rearrange to the isomeric methane derivatives.The results are explained by the involvement of pentacoordinated silicon derivatives, which only occur as transient species, however.A compound with pentacoordinated silicon in the ground state is obtained from Li and RSiCl3 (R = Ph), but it slowly rearranges to the isomeric methane derivative (Me2P)2(Me3Si)(Cl2PhSi)C within four weeks at +20 deg C.Within six weeks, further rearrangement occurs to give the ylide (Me2P-PMe2=C(SiMe3)(SiPhCl2).For R = t-Bu, only the analogous rearranged ylide is found.Its molecular structure was confirmed by an X-ray structure determination.Key words: Phosphinomethanes, Phosphinomethanides, Phosphorus Ylides, Skeleton Rearrangement