3390-61-2

Basic information

• Product Name: 1,1,3,5,5-Pentaphenyl-1,3,5-trimethyltrisiloxane
• Synonyms: CHLORODIMETHYLPHENETHYLSILANE;PHENETHYLDIMETHYLCHLOROSILANE;1,3,5-trimethyl-1,1,3,5,5-pentaphenyl-trisiloxan;Trisiloxane, 1,3,5-trimethyl-1,1,3,5,5-pentaphenyl-;705 silicone diffusion pump fluid.;dow corning®1,1,3,5,5-Pentaphenyl-1,3,5-trimethyltrisiloxane;1,3,5-Trimethyl-1,1,3,5,5-pentaphenyltrisiloxane
• CAS NO: 3390-61-2
• Molecular Formula: C₃₃H₃₄O₂Si₃
• Molecular Weight: 546.88
• EINECS: 222-222-9
• Mol File: 3390-61-2.mol
• Article Data: 4

Chemical Properties

• Melting Point: -25°C
• Boiling Point: 245 °C0.5 mm Hg
• Flash Point: 214 °F
• Appearance: /solid
• Density: 1.09 g/mL at 25 °C
• Vapor Pressure: 0mmHg at 25°C
• Refractive Index: n20/D 1.58
• Water Solubility: insoluble
• CAS DataBase Reference: 1,1,3,5,5-Pentaphenyl-1,3,5-trimethyltrisiloxane(CAS DataBase Reference)
• NIST Chemistry Reference: 1,1,3,5,5-Pentaphenyl-1,3,5-trimethyltrisiloxane(3390-61-2)
• EPA Substance Registry System: 1,1,3,5,5-Pentaphenyl-1,3,5-trimethyltrisiloxane(3390-61-2)

Safety Data

• Hazard Codes: Xi
• Statements: 36
• Safety Statements: 26-36-39
• WGK Germany: 3
• TSCA: Yes
• Hazardous Substances Data: 3390-61-2(Hazardous Substances Data)

Usage

Flammability and Explosibility

Notclassified

InChI:InChI=1/C33H34O2Si3/c1-36(2,3)34-38(32-25-15-7-16-26-32,33-27-17-8-18-28-33)35-37(29-19-9-4-10-20-29,30-21-11-5-12-22-30)31-23-13-6-14-24-31/h4-28H,1-3H3

Synthetic route

dodecylbenzene-sulphonic acid (47221-31-8) + diphenylmethylsilanol (778-25-6) → 1,1,3,5,5-pentaphenyl-1,3,5-trimethyltrisiloxane (3390-61-2)

Conditions	Yield
In toluene	90.2%

1,3,5-trimethyl-1,1,5,5-tetraethoxy-3-phenyltrisiloxane + chlorobenzene (108-90-7) → 1,1,3,5,5-pentaphenyl-1,3,5-trimethyltrisiloxane (3390-61-2)

Conditions	Yield
With sodium In toluene at 105℃; for 7h;	83.5%

methyldiphenylsilane (776-76-1) + dichloromethylphenylsilane (149-74-6) → tetramethyl hexaphenyl tetrasiloxane (38421-40-8) + 1,1,3,5,5-pentaphenyl-1,3,5-trimethyltrisiloxane (3390-61-2)

Conditions	Yield
Stage #1: methyldiphenylsilane With sodium hydroxide In methanol; toluene Stage #2: dichloromethylphenylsilane

C20H21OPolSi2 → 1,1,3,5,5-pentaphenyl-1,3,5-trimethyltrisiloxane (3390-61-2)

Conditions	Yield
at 475℃; for 5h; Autoclave;

C20H21OPolSi2 → tetramethyl hexaphenyl tetrasiloxane (38421-40-8) + 1,1,3,5,5-pentaphenyl-1,3,5-trimethyltrisiloxane (3390-61-2)

Conditions	Yield
at 425℃; for 5h; Autoclave;

C20H21OPolSi2 → tetramethyl hexaphenyl tetrasiloxane (38421-40-8) + 1,3-Dimethyl-1,1,3,3-tetraphenyldisiloxan (807-28-3) + 1,1,3,5,5-pentaphenyl-1,3,5-trimethyltrisiloxane (3390-61-2)

Conditions	Yield
at 450℃; for 5h; Autoclave;

Upstream product

• 108-90-7 chlorobenzene 
• 776-76-1 methyldiphenylsilane 
• 149-74-6 dichloromethylphenylsilane 
• 47221-31-8 dodecylbenzene-sulphonic acid 
• 778-25-6 diphenylmethylsilanol 

Relevant articles and documents

Possibilities of using trimethylpentaphenyltrisiloxane as coolant for removing low-potential heat

The resistance of commercial trimethylpentaphenyltrisiloxane to heat and to thermal oxidation was studied. The limits of its use as coolant in systems for removing low-potential heat were determined. Instrumental methods were developed and tested for moni

Production of methylphenyltrisiloxane

A process of producing a methylphenyltrisiloxane having the following general formula: STR1 wherein R1 and R2 may be the same or different and are each a methyl or phenyl group, the process comprising the step of reacting: (A) methyldiphenylsilanol, with (B) a silazane compound having a diorganosilazane unit having the following formula: STR2 wherein R1 and R2 are as defined above. According to the process, colorless and odorless methylphenyltrisiloxanes can be obtained easily, safely and economically, without any special deodorizing or decoloring step.