13176-69-7

Basic information

• Product Name: 1,1,3,3,5,5,7,7,7-nonamethyltetrasiloxanol
• Synonyms: 1,1,3,3,5,5,7,7,7-nonamethyltetrasiloxanol;1-Hydroxy Nonamethyltetrasiloxane;1,1,3,3,5,5,7,7,7-Nonamethylheptanetetrasiloxane-1-ol;Einecs 236-123-3
• CAS NO: 13176-69-7
• Molecular Formula: C₉H₂₈O₄Si₄
• Molecular Weight: 312.65822
• EINECS: 236-123-3
• Mol File: 13176-69-7.mol
• Article Data: 4

Chemical Properties

• Boiling Point: 250.3°Cat760mmHg
• Flash Point: 105.2°C
• Appearance: /
• Density: 0.928g/cm³
• Vapor Pressure: 0.00346mmHg at 25°C
• Refractive Index: 1.421
• CAS DataBase Reference: 1,1,3,3,5,5,7,7,7-nonamethyltetrasiloxanol(CAS DataBase Reference)
• NIST Chemistry Reference: 1,1,3,3,5,5,7,7,7-nonamethyltetrasiloxanol(13176-69-7)
• EPA Substance Registry System: 1,1,3,3,5,5,7,7,7-nonamethyltetrasiloxanol(13176-69-7)

Safety Data

• Hazardous Substances Data: 13176-69-7(Hazardous Substances Data)

Usage

General Description

1,1,3,3,5,5,7,7,7-nonamethyltetrasiloxanol is a chemical compound commonly used as a coating or surface treatment agent in various industrial applications. It belongs to the class of organosilicon compounds, which are known for their water-repellent and non-stick properties. This particular compound is composed of nine methyl groups attached to a linear tetrasiloxane backbone, resulting in a highly hydrophobic and stable structure. It is often used in the production of waterproof coatings for textiles, paper, and leather, as well as in the manufacturing of silicone-based sealants and adhesives. Additionally, 1,1,3,3,5,5,7,7,7-nonamethyltetrasiloxanol is also utilized as a surface treatment agent for electronic components and as a lubricant additive in certain industrial processes. Its chemical properties make it an effective and versatile component in various applications requiring water repellency and surface protection.

InChI:InChI=1/C9H28O4Si4/c1-14(2,3)11-16(6,7)13-17(8,9)12-15(4,5)10/h10H,1-9H3

Upstream product

• 85461-52-5 1,1,3,3,5,5,5-heptamethyltrisiloxane-1-ol 
• 541-05-9 Hexamethylcyclotrisiloxane 
• 14415-31-7 1-chloro-1,1,3,3,5,5,7,7,7-nonamethyltetrasiloxane 

Relevant articles and documents

Polycondensation and disproportionation of an oligosiloxanol in the presence of a superbase

Kinetics of reactions of model oligosiloxanols, 1,1,3,3,3-pentamethyldisiloxane-1-ol (MDH) and 1,1,3,3,5,5,5-heptamethyltrisiloxane-1-ol (MD2H), which occur in the presence of phosphazenium superbase, hexapyrrolidine-diphosphazenium hydroxide, in an acid-base inert solvent, toluene, was studied using sampling and gas chromatographic analysis method. In addition, kinetics of reactions of MDH and MD2H with trimethylsilanol (MH) was studied. In the MDH and MD2H systems the oligosiloxanol condensation competes with the oligosiloxanol disproportionation, the latter being the dominating process. The disproportionation products, i.e. MDn+1H and MDn-1H, n=1, 2, ? undergo analogous consecutive disproportionation and condensation reactions. The kinetic law was derived and rate parameters determined from initial rates and by computer simulation to the best agreement with experimental data. Both competing reactions, the disproportionation and the condensation, conform to the same general kinetic law being first internal order in substrate and first order in catalyst. Activation parameters of these reactions were determined. The results were interpreted in terms of a bimolecular mechanism in which nucleophilic attack of the silanolate anion directed to silicon of the silanol group causes the cleavage of one of its geminal bonds to oxygen, either the one to hydroxyl leading to condensation or the one to siloxane which leads to disproportionation. The latter is faster as the silanolate is a better leaving group compared with OH-. Moreover, in the pentacoordinate silicon transition state (or intermediate) the siloxane substituent preferentially enters the apical position, thus driving the OH substituent into the unreactive equatorial position.

Procedures for the preparation of silanols

Two procedures are described for the preparation of silanols and silanediols from the corresponding chlorosilanes.The first procedure, a two-phase hydrolysis-extraction process, is- particularly convenient and suited to the preparation of a wide range of mono-silanols.Hydrolysis of dichlorosilanes by this procedure gives varied results depending on the structure of the dichlorosilane and specific reaction conditions.The second procedure, a modification of a published procedure, is especially beneficial for the preparation of silanols and silanediols prone to undergo self-condensation. Key words: Silicon; Hydrolysis; Self-condensation; Silanols