Name: Sodium bicarbonate CAS No.: 144-55-8 Appearance: White powder or opaque monoclinic system fine crystals Molecular formula: CHNaO3 Molecular Weight: 84.01 Melting point:>300 °C(lit.) PACKAGE:25KG/BAG
Name: Dichroromethylvinylsilane CAS number: 124-70-9 Molecular formula: C3H6Cl2Si Molecular weight: 141.07 EINECS number: 204-710-3 Mol file: 124-70-9.mol
Name: Vinyltrimethylsilane CAS number: 754-05-2 Molecular formula: C5H12Si Molecular weight: 100.23 EINECS number: 212-042-9 Mol file: 754-05-2.mol
Name: Ethoxydimethylvinylsilane CAS number: 5356-83-2 Molecular formula: C6H14OSi Molecular weight: 130.26 EINECS number: 226-341-7 Mol file: 5356-83-2.mol
Name: CHLORODIMETHYLPINYLSILANE CAS number: 1719-58-0 Molecular formula: C4H9ClSi Molecular weight: 120.65 EINECS number: 217-007-1 Mol file: 1719-58-0.mol
Name: 1,1,3,3-TETRAMETHYL-1,3-DIVINYLDISILAZANE CAS number: 7691-02-3 Molecular formula: C8H19NSi2 Molecular weight: 185.41 EINECS number: 231-701-1 Mol file: 7691-02-3.mol
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Specification
Melting point 171-175 ° C (lit.)
Boiling point 67 ° C
Density 0.904 g/mL at 25 ° C
Flash point 43 ° F
Storage conditions 2-8 ° C
Solubility in hexane, toluene, ether, terahydrofuran, benzene, and toluene
Form Liquid
Specific gravity 0.9
Color Clear orange to brown
Applications
Bis (trimethylsilyl) amino sodium (NaHMDS) is a representative of homologous compounds, as well as bis (trimethylsilyl) amino lithium (LiHMDS) and bis (trimethylsilyl) amino potassium (KHMDS). They are widely used strong base reagents with large steric hindrance in organic synthesis, and the bis (trimethylsilyl) amino group has a pKa=29.5 in tetrahydrofuran. Compared with diisopropylamino lithium (LDA), it has weaker alkalinity, but is very convenient to operate and use. It has good solubility in most organic solvents, and the temperature range used is wide, and its reaction ability can be adjusted from -78 ℃ to the reflux temperature of toluene. Its chemical reactivity is very similar to LDA and is often used to generate carbon negative ions and enol ions.
application
NaHMDS is widely used to neutralize C-H type acids. For example, some typical examples:
Deprotonating ketones and esters to obtain their enol derivatives.
By dehydrohalogenating CH2X2 (X=Br, I), halogenated carbenes in the form of CHBr and CHI were obtained. These carbene compounds can be added to olefins to obtain cyclopropane compounds containing substituents.
Prepare Georg Wittig reagent by deprotonation of quaternary ammonium salts.
Deprotonation of cyanohydrin.
NaHMDS can also serve as a neutralizing base for N-H type acids.
Purpose
Non nucleophilic strong base
Package: 200kg/drum
Name:Methyltrichlorosilane CAS No.:75-79-6 Appearance: Colorless transparent liquid Molecular formula: CCl3Si Molecular Weight: 146.4536 Relative density (water=1): 1.28 Flash point: -9℃ (closed cup) Melting point: -90℃ Boiling point: 66℃
Name:Methyltrichlorosilane CAS No.:75-79-6 Appearance: Colorless transparent liquid Molecular formula: CCl3Si Molecular Weight: 146.4536 Relative density (water=1): 1.28 Flash point: -9℃ (closed cup) Melting point: -90℃ Boiling point: 66℃
Name:Methyltrichlorosilane CAS No.:75-79-6 Appearance: Colorless transparent liquid Molecular formula: CCl3Si Molecular Weight: 146.4536 Relative density (water=1): 1.28 Flash point: -9℃ (closed cup) Melting point: -90℃ Boiling point: 66℃
Name:Methyltrichlorosilane CAS No.:75-79-6 Appearance: Colorless transparent liquid Molecular formula: CCl3Si Molecular Weight: 146.4536 Relative density (water=1): 1.28 Flash point: -9℃ (closed cup) Melting point: -90℃ Boiling point: 66℃
Name:Dichlorodimethylsilane CAS No.:75-78-5 Appearance: Colorless transparent liquid Molecular formula: C2H6Cl2Si Molecular Weight: 129.0605 EINECS No.:200-901-0 Density: 1.075g/cm3 Melting point: -76℃ Boiling point: 70°C at 760 mmHg Vapor Pressure: 143mmHg at 25°C Refractive index: 1.4023 Flash point: -8.9℃ Solubility: soluble in benzene and ether.
Name:Dichlorodimethylsilane CAS No.:75-78-5 Appearance: Colorless transparent liquid Molecular formula: C2H6Cl2Si Molecular Weight: 129.0605 EINECS No.:200-901-0 Density: 1.075g/cm3 Melting point: -76℃ Boiling point: 70°C at 760 mmHg Vapor Pressure: 143mmHg at 25°C Refractive index: 1.4023 Flash point: -8.9℃ Solubility: soluble in benzene and ether.
Name:Dichlorodimethylsilane CAS No.:75-78-5 Appearance: Colorless transparent liquid Molecular formula: C2H6Cl2Si Molecular Weight: 129.0605 EINECS No.:200-901-0 Density: 1.075g/cm3 Melting point: -76℃ Boiling point: 70°C at 760 mmHg Vapor Pressure: 143mmHg at 25°C Refractive index: 1.4023 Flash point: -8.9℃ Solubility: soluble in benzene and ether.
Name:Dichlorodimethylsilane CAS No.:75-78-5 Appearance: Colorless transparent liquid Molecular formula: C2H6Cl2Si Molecular Weight: 129.0605 EINECS No.:200-901-0 Density: 1.075g/cm3 Melting point: -76℃ Boiling point: 70°C at 760 mmHg Vapor Pressure: 143mmHg at 25°C Refractive index: 1.4023 Flash point: -8.9℃ Solubility: soluble in benzene and ether.
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