1693-44-3

Basic information

• Product Name: 2,2,4,4,6,6-hexamethyl-8,8-diphenylcyclotetrasiloxane
• Synonyms: 2,2,4,4,6,6-hexamethyl-8,8-diphenylcyclotetrasiloxane;2,2,4,4,6,6-Hexamethyl-8,8-diphenylcyclooctanetetrasiloxane;2,2-Diphenyl-4,4,6,6,8,8-hexamethylcyclooctanetetrasiloxane
• CAS NO: 1693-44-3
• Molecular Formula: C₁₈H₂₈O₄Si₄
• Molecular Weight: 428.81804
• EINECS: 216-895-8
• Mol File: 1693-44-3.mol
• Article Data: 5

Chemical Properties

• Boiling Point: 353.9°Cat760mmHg
• Flash Point: 146°C
• Appearance: /
• Density: 1.06g/cm³
• Vapor Pressure: 7.1E-05mmHg at 25°C
• Refractive Index: 1.513
• CAS DataBase Reference: 2,2,4,4,6,6-hexamethyl-8,8-diphenylcyclotetrasiloxane(CAS DataBase Reference)
• NIST Chemistry Reference: 2,2,4,4,6,6-hexamethyl-8,8-diphenylcyclotetrasiloxane(1693-44-3)
• EPA Substance Registry System: 2,2,4,4,6,6-hexamethyl-8,8-diphenylcyclotetrasiloxane(1693-44-3)

Safety Data

• Hazardous Substances Data: 1693-44-3(Hazardous Substances Data)

Usage

Molecular structure

2,2,4,4,6,6-hexamethyl-8,8-diphenylcyclotetrasiloxane is a cyclic molecule containing four silicon atoms and oxygen atoms in a ring structure, with six methyl groups and two phenyl groups attached to the silicon atoms.

Type of compound

It is a type of cyclotetrasiloxane, which is a group of chemical compounds.

Industrial and consumer applications

It is used in a variety of industrial and consumer applications, including as a solvent, a lubricant additive, and in the production of silicone polymers.

Use as a crosslinking agent

It is used as a crosslinking agent in the manufacture of silicone rubbers and resins.

Potential applications

It has been studied for potential applications in electronic materials and biomedical research.

InChI:InChI=1/C18H28O4Si4/c1-23(2)19-24(3,4)21-26(22-25(5,6)20-23,17-13-9-7-10-14-17)18-15-11-8-12-16-18/h7-16H,1-6H3

Upstream product

• 75-78-5 dimethylsilicon dichloride 
• 80-10-4 diphenylsilyl dichloride 
• 1189-93-1 1,3,3,5,5-hexamethyltrisiloxane 
• 947-42-2 diphenylsilanediol 
• 541-05-9 Hexamethylcyclotrisiloxane 
• 6843-66-9 dimethoxy(diphenyl)silane 
• 556-67-2 octamethylcyclotetrasiloxane 
• 1000206-70-1 1,1,3,3-tetramethyl-2,2-diphenyl-1,2,3-trisilacyclohexane 
• 1072-43-1 propylene sulphide 
• 75-56-9 methyloxirane 

Relevant articles and documents

PROCESS FOR THE PRODUCTION OF CYCLOSILOXANES

Embodiments of the invention are directed to the preparation of a discrete cyclosiloxane or a discrete mixture of cyclosiloxanes where a dihydroxysilane or dihydroxysiloxane condenses with a dihydrosilane or dihydroxysiloxane in the presence of a Lewis acid catalyst in a reaction phase including a solvent. The introduction of the dihydroxysilane or dihydroxysiloxane and dihydrosilane or dihydroxysiloxane is controlled such that the cyclocondensation occurs in a reaction phase that is dilute in the SiH and SiOH functionality permitting the isolation of the monocyclocondensation adduct in high yield with little higher molecular weight condensation products. In one embodiment of the invention 1,1-diphenyl-3,3,5,5-tetramethylcyclotrisiloxane is prepared in very high yield.

Electrochemical activation of diorganyl dialkoxysilanes for siloxane backbone extension

The reaction of diorganyl dialkoxysilanes PhRSi(OAlk)2 (R = Ph, vinyl, OMe; Alk = Me, Et) with electrochemically reduced forms of oxygen provides reactive intermediates that insert into hexamethyldisiloxane or permethyl cyclosiloxanes, D3

DEHYDROCONDENSATION OF ORGANIC HYDROSILANES WITH SILANOLS. PART II. EFFECT OF SILOXANE CHAIN LENGTH ON THE REACTIVITY OF SI-H END-GROUPS. THE SUBSTITUTION EFFECT

It has been found that the reactivity of Si-H end-groups in the homologous series of α,-dihydropolidimethylsiloxanes H(Me2SiO)nSiMe2H in their reaction with diphenylsilanediol in DMF and in presence of ZnCl2 decreases for n changing from 1 to 3 and is stabilized for larger n.The substitution effect of a single Si-H group in 1,1,3,3-tetramethyldisiloxane by triphenylsilanol was determined from rate measurements of the reaction of the primary product of condensation: 1,1,3,3-tetramethyl-5,5,5-triphenyltrisiloxane, which was prepared independently.A kinetic model of non-equilibrium polycondensation proceeding with a single reactivity change of a functional group was devised and numerically checked.