4112-23-6

Basic information

• Product Name: dimethyl(methylidene)silane
• CAS NO: 4112-23-6
• Molecular Formula: C₃H₈Si
• Molecular Weight: 72.1811
• Mol File: 4112-23-6.mol
• Article Data: 12

Chemical Properties

• CAS DataBase Reference: dimethyl(methylidene)silane(CAS DataBase Reference)
• NIST Chemistry Reference: dimethyl(methylidene)silane(4112-23-6)
• EPA Substance Registry System: dimethyl(methylidene)silane(4112-23-6)

Safety Data

• Hazardous Substances Data: 4112-23-6(Hazardous Substances Data)

Upstream product

• 2295-12-7 1,1-dimethylsilacyclobutane 
• 67-56-1 methanol 
• 75-76-3 tetramethylsilane 
• 3439-38-1 trimethylsilylethane 
• 16571-41-8 trimethylsilyl radical 
• 762-72-1 allyl-trimethyl-silane 
• 344864-98-8 [(3,3-Dimethyl-1-trimethylsilanyl-butyl)-methoxy-methyl-silanyl]-benzene 
• 5181-46-4 chloromethylpentamethyldisilane 
• 1450-14-2 1,1,1,2,2,2-hexamethyldisilane 
• 3574-04-7 hexamethylcyclotrisilathiane 

Downstream Products

• 1825-62-3 ethyl trimethylsilyl ether 
• 1825-61-2 Trimethylmethoxysilane 

Relevant articles and documents

Improved First Ionization Potential of the Dimethylsilaethylene Molecule Obtained with High-Temperature Photoelectron Spectroscopy

The vacuum-ultraviolet photoelectron spectrum of the pyrolysis products of 1,1-dimethyl-1-silacyclobutane (DMSCB) has been recorded.The band associated with the first ionization potential of the 1,1-dimethyl-1-silaethylene (DMSE) molecule has been observed with vertical and adiabatic ionization potentials of 7.98+/-0.01 eV and 7.71+/-0.03 eV, respectively.Analysis of the observed vibrational structure in this band gave ωe = 760+/-30 cm-1 and this is assigned to excitation of the H2C-Si+ to be derived as 745+/-11 kJ mol-1.

Stationary and Pulsed Photolysis and Pyrolysis of 1,1-Dimethylsilacyclobutane

A study of the photolysis of 1,1-dimethylsilacyclobutane at 147 - 214 nm shows that of the four primary processes identified the predominant mode of decomposition is to C2H4 and dimethylsilaethene.Evidence from experiments in the presence of SF6 suggests that the dimethylsilaethene is formed initially in a vibrationally excited state: +hν -> Me2SiCH2v + CH2=CH2.Laser pulsed photolysis experiments at 193 nm have been carried out to measure tha absorption spectrum of Me2SiCH2, its absorption cross section, and the rate constant for Me2SCH2 combination: 2Me2SiCH2 -> (Me2SiCH2)2.The values obtained are ? (240 nm, base e) = (1.0 +/- 0.2)E-17 cm2 and k7 = (3.3 +/- 0.8)E-11 cm3 s-1.The kinetics of the pyrolysis of have also been reexamined, yielding the following rate constant expressions: k1/(s-1) = E(15.46 +/- 0.13) exp(-(31043 +/- 218)/T) and k-1/k71/2/(cm3/2s-1/2) = E(-7.0 +/- 0.3) exp(-(7850 +/- 300)/T).From these results, the heat of formation, ?-bond energy, and entropy of Me2SiCH2, have been deduced: ΔHfθ (g, 298 K) = 36 +/- 7 kJ mol-1, B? = 157 +/- 11 kJ mol-1, and Sθ(g, 298 K) = 332 +/- 8 J mol-1 K-1.

DIRECT DETECTION OF UNSTABLE INTERMEDIATES FROM THE PYROLISYS OF ALLYLTRIMETHYLSILANE BY MEANS OF MASS SPECTROMETRY AND MATRIX IR SPECTROSCOPY

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