188240-37-1

Basic information

• Product Name: 1,1-diphenyl-3,5-bis-trimethylsiloxy-3,5-dimethylcyclotrisiloxane
• Synonyms: 1,1-diphenyl-3,5-bis-trimethylsiloxy-3,5-dimethylcyclotrisiloxane
• CAS NO: 188240-37-1
• Molecular Weight: 494.914
• Mol File: 188240-37-1.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: 1,1-diphenyl-3,5-bis-trimethylsiloxy-3,5-dimethylcyclotrisiloxane(CAS DataBase Reference)
• NIST Chemistry Reference: 1,1-diphenyl-3,5-bis-trimethylsiloxy-3,5-dimethylcyclotrisiloxane(188240-37-1)
• EPA Substance Registry System: 1,1-diphenyl-3,5-bis-trimethylsiloxy-3,5-dimethylcyclotrisiloxane(188240-37-1)

Safety Data

• Hazardous Substances Data: 188240-37-1(Hazardous Substances Data)

Upstream product

• 16066-09-4 1,1,1,3,5,7,7,7-octamethyltetrasiloxane 
• 947-42-2 diphenylsilanediol 

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.