1276694-52-0

Basic information

• Product Name: syn-1,3,9,11-tetramethyl-5,5,7,7,13,13,15,15-octaphenyltricyclo[9.5.1.1(3,9)]octasiloxane
• Synonyms: syn-1,3,9,11-tetramethyl-5,5,7,7,13,13,15,15-octaphenyltricyclo[9.5.1.1(3,9)]octasiloxane
• CAS NO: 1276694-52-0
• Molecular Weight: 1061.66
• Mol File: 1276694-52-0.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: syn-1,3,9,11-tetramethyl-5,5,7,7,13,13,15,15-octaphenyltricyclo[9.5.1.1(3,9)]octasiloxane(CAS DataBase Reference)
• NIST Chemistry Reference: syn-1,3,9,11-tetramethyl-5,5,7,7,13,13,15,15-octaphenyltricyclo[9.5.1.1(3,9)]octasiloxane(1276694-52-0)
• EPA Substance Registry System: syn-1,3,9,11-tetramethyl-5,5,7,7,13,13,15,15-octaphenyltricyclo[9.5.1.1(3,9)]octasiloxane(1276694-52-0)

Safety Data

• Hazardous Substances Data: 1276694-52-0(Hazardous Substances Data)

Upstream product

• 1104-93-4 1,1,3,3-tetraphenyldisiloxane-1,3-diol 
• 7756-87-8 1,3-dichloro-1,1,3,3-tetraphenyldisiloxane 
• 80-10-4 diphenylsilyl dichloride 

Relevant articles and documents

Stereochemistry of the reaction of cis,trans,cis-2,4,6,8-tetraisocyanato-2, 4,6,8-tetramethylcyclotetrasiloxane with triphenylsilanol and 1,1,3,3-tetraphenyldisiloxane-1,3-diol

All-cis-2,4,6,8-tetramethyl-2,4,6,8-tetrakis(triphenylsiloxy) cyclotetrasiloxane (4) and syn-1,3,9,11-tetramethyl-5,5,7,7,13,13,15,15- octaphenyltricyclo[9.5.1.13,9]octasiloxane (5) were synthesized by the reaction of cis,trans,cis-[MeSi(NCO)O]4 (1) with Ph 3SiOH (2) and [Ph2Si(OH)]2O (3), respectively, in the presence of pyridine for the sake of investigating the synthesis of ladder polysilsesquioxanes with perfect siloxane frameworks. Their stereostructures were confirmed by nuclear magnetic resonance spectra and X-ray crystallography, which revealed that 4 and 5 did not retain the stereostructure of the precursor 1. This result was caused by the racemization of 1 with pyridine, and a subsequent nucleophilic substitution reaction of 1 with 2 or 3, including inversion and retention of the configuration at the silicon atoms.