18148-76-0

Basic information

• Product Name: 1,3,5,7-tetrachloro-1,3,5,7-tetramethylcyclotetrasiloxane
• Synonyms: 1,3,5,7-tetrachloro-1,3,5,7-tetramethylcyclotetrasiloxane
• CAS NO: 18148-76-0
• Molecular Weight: 378.291
• Mol File: 18148-76-0.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: 1,3,5,7-tetrachloro-1,3,5,7-tetramethylcyclotetrasiloxane(CAS DataBase Reference)
• NIST Chemistry Reference: 1,3,5,7-tetrachloro-1,3,5,7-tetramethylcyclotetrasiloxane(18148-76-0)
• EPA Substance Registry System: 1,3,5,7-tetrachloro-1,3,5,7-tetramethylcyclotetrasiloxane(18148-76-0)

Safety Data

• Hazardous Substances Data: 18148-76-0(Hazardous Substances Data)

Upstream product

• 75-79-6 Methyltrichlorosilane 
• 67-68-5 dimethyl sulfoxide 
• 123-86-4 acetic acid butyl ester 

Downstream Products

• 556-67-2 octamethylcyclotetrasiloxane 
• 75-79-6 Methyltrichlorosilane 
• 123-86-4 acetic acid butyl ester 

Relevant articles and documents

Generation and capture of alkylchlorosilanones

Alkyltrichlorosilanes react with DMSO (molar ratio 1 : 1, 0 °C) to give cyclic oligoalkylchlorosiloxanes of the general formula [R(Cl)SiO]n (where R = Me or Et; n = 3-6). With an excess of alkyltrichlorosilane (2 : 1), linear oligoalkylchlorosiloxanes Cl[R(Cl)SiO]mSiCl2R (where R = Me or Et; m = 1-5) are also formed. In the presence of hexamethyldisiloxane (molar ratio Cl3SiR : DMSO : (Me3Si)2O = 1 : 1 : 2, 20 °C), the reaction products are both cyclic and linear oligoalkyl(trimethylsilyloxy)siloxanes [R(Me3SiO)SiO]n (n = 3-5) and Me3Si[OSi(OSiMe3)R]mOSiMe3 (m = 1-3), respectively. The reaction of DMSO with trichloro(vinyl)silane and hexamethyldisiloxane occurs in a similar manner. A plausible scheme of formation of the final products via intermediate alkylchlorosilanones RClSi=O and alkyl(trimethylsilyloxy)silanones is discussed.