6166-86-5

Basic information

• Product Name: PENTAMETHYLCYCLOPENTASILOXANE
• Synonyms: 2,4,6,8,10-PENTAMETHYLCYCLOPENTASILOXANE;PENTAMETHYLCYCLOPENTASILOXANE;2,4,6 8,10-PENTAMETHYLCYCLOPENTASILOXANE TECH 90+%;PENTAMETHYLCYCLOPENTASILOXANE: 90% CONTAINS OTHER CYCLIC HOMOLOGS;PENTAMETHYLCYCLOPENTASILOXANE CONTAINS OTHER CYCLIC HOMOLOGS;2,4,6,8,10-Pentamethylcyclodecanepentasiloxane;2,4,6,8,10-Pentamethylcyclodecapentasiloxane;Cyclopentasiloxane, 2,4,6,8,10-pentamethyl-
• CAS NO: 6166-86-5
• Molecular Formula: C₅H₂₀O₅Si₅
• Molecular Weight: 300.64
• EINECS: 228-204-7
• Product Categories: Organometallic Reagents;SiliconOrganometallic Reagents;Organosilicon;Precursors by Metal;Siloxanes;Vapor Deposition Precursors;Chemical Synthesis;CVD and ALD Precursors by Metal;Materials Science;Micro/NanoElectronics;Organometallic Reagents;Silicon;Vapor Deposition Precursors
• Mol File: 6166-86-5.mol
• Article Data: 6

Chemical Properties

• Melting Point: -108°C
• Boiling Point: 54 °C10 mm Hg(lit.)
• Flash Point: 39°C
• Appearance: /liquid
• Density: 0.992 g/mL at 25 °C(lit.)
• Vapor Pressure: 1.935mmHg at 25°C
• Refractive Index: n20/D 1.392(lit.)
• Storage Temp.: 2-8°C
• Water Solubility: 110-1000000000μg/L at 20℃
• BRN: 1792134
• CAS DataBase Reference: PENTAMETHYLCYCLOPENTASILOXANE(CAS DataBase Reference)
• NIST Chemistry Reference: PENTAMETHYLCYCLOPENTASILOXANE(6166-86-5)
• EPA Substance Registry System: PENTAMETHYLCYCLOPENTASILOXANE(6166-86-5)

Safety Data

• Hazard Codes: Xi
• Statements: 10-36/37/38
• Safety Statements: 16-26-36
• RIDADR: UN 1993 3/PG 3
• WGK Germany: 3
• F: 10-21
• TSCA: Yes
• Hazardous Substances Data: 6166-86-5(Hazardous Substances Data)

Usage

Flammability and Explosibility

Flammable

InChI:InChI=1/C5H20O5Si5/c1-13-7-11-6-12-8-14(2,3)10-15(4,5)9-13/h13H,11-12H2,1-5H3

Upstream product

• 75-54-7 Dichloromethylsilane 
• 75-77-4 chloro-trimethyl-silane 
• 60-29-7 diethyl ether 
• 7732-18-5 water 

Downstream Products

• 18846-41-8 2,4,6,8-tetramethyl-2,4,6,8-tetrakis-(2-phenyl-propyl)-cyclotetrasiloxane 
• 18758-65-1 2,4,6-trimethyl-2,4,6-tris-(2-phenyl-propyl)-cyclotrisiloxane 
• 1873-88-7 1,1,1,3,5,5,5-heptamethyltrisiloxan 

Relevant articles and documents

Hydrocarbyl the cyclosiloxane preparation method (by machine translation)

The invention discloses a preparation method of alkyl cyclosiloxane. The preparation method is characterized by comprising the following steps: taking alkyl halogenosilane as a raw material, taking crown ether as a solvent and dropping the alkyl halogenosilane in a mixed solution formed by water and the crown ether while continuously stirring the alkyl halogenosilane; carrying out hydrolysis at a certain temperature to carry out condensation polymerization; standing after the reaction to carry out layering; and directly carrying out decompressed rectification on the obtained hydrolyzed oil to separate trialkylcyclotrisiloxane, tetraalkylcyclotetrasiloxane, pentaalkylcyclopentasiloxane and hexaalkylcyclohexasiloxane. The preparation method has the advantages that alcohols and low-boiling point hydrocarbons are not used as solvents, the crown ether is used as solvent and direct rectification is carried out on the prepared hydrolyzed oil to obtain the alkyl cyclosiloxane, so that the processes of washing, neutralization, drying and filtering are saved; and the solvent which undergoes standing and layering after the hydrolysis can be reused or can be cooled to a certain temperature to separate out the crown ether for recovery, so that the production cost is saved.

PROCESS FOR PREPARING CYCLIC ORGANOHYDROGENSILOXANES

A process for preparing cyclic organohydrogensiloxanes comprises: (A) contacting a silane of the formula RHSiCl2, where R is selected from alkyl radicals having 1 to 12 carbon atoms and aryl radicals, with water to form a hydrolyzate comprising cyclic organohydrogensiloxanes and linear organohydrogensiloxanes, and (B) contacting the hydrolyzate with an acidic rearrangement catalyst in the presence of an inert liquid diluent to increase the ratio of the cyclic organohydrogensiloxanes to linear organohydrogensiloxanes in the hydrolyzate. The acidic rearrangement catalyst is an organic compound containing a strong acid group, for example a sulphonic acid, which is dissolved in the inert diluent present.

EFFECT OF HYDROCHLORIC ACID ON RING FORMATION IN HYDROLYTIC POLYCONDENSATION OF DIFUNCTIONAL ORGANOCHLOROSILANES

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