5272-21-9

Basic information

• Product Name: 3-Trisiloxanol, 1,1,1,3,5,5,5-heptamethyl-
• CAS NO: 5272-21-9
• Molecular Formula: C7H22O3Si3
• Molecular Weight: 238.506
• Mol File: 5272-21-9.mol
• Article Data: 4

Chemical Properties

• CAS DataBase Reference: 3-Trisiloxanol, 1,1,1,3,5,5,5-heptamethyl-(CAS DataBase Reference)
• NIST Chemistry Reference: 3-Trisiloxanol, 1,1,1,3,5,5,5-heptamethyl-(5272-21-9)
• EPA Substance Registry System: 3-Trisiloxanol, 1,1,1,3,5,5,5-heptamethyl-(5272-21-9)

Safety Data

• Hazardous Substances Data: 5272-21-9(Hazardous Substances Data)

Upstream product

• 107-51-7 octamethyltrisiloxabe 
• 141-62-8 decamethyltetrasiloxane 
• 1185-55-3 Methyltrimethoxysilan 
• 107-46-0 Hexamethyldisiloxane 
• 1873-88-7 1,1,1,3,5,5,5-heptamethyltrisiloxan 
• 75-77-4 chloro-trimethyl-silane 
• 75-79-6 Methyltrichlorosilane 

Downstream Products

• 17928-28-8 methyltrimethicone 
• 104144-47-0 C₂₁H₃₆Cl₂O₄Si₅ 
• 104144-44-7 C₂₁H₃₆Cl₂O₄Si₅ 
• 104144-48-1 C₂₂H₃₉ClO₄Si₅ 
• 104144-46-9 C₂₂H₃₉ClO₄Si₅ 
• 104144-45-8 C₂₁H₃₇ClO₄Si₅ 

Relevant articles and documents

Iridium-catalyzed hydrogen production from hydrosilanes and water

The iridium(III) complex [Ir(H)(CF3SO3)(NSiN)(coe)] (NSiN=fac-coordinated bis(pyridine-2-yloxy)methylsilyl, coe=cyclooctene) has been proven to be an effective catalyst precursor for hydrogen production from the hydrolysis of hydrosilanes at room temperature. The reaction performance depends both on the nature of the silane and the solvent. Interestingly, high turnover frequencies of around 105 h-1 were obtained by using Et2SiH2 or (Me2HSi)2O as hydrogen sources and THF as the solvent. Moreover a mechanistic insight into this Ir-catalyzed hydrogen generation process, based on both theoretical calculations and NMR spectroscopy, is reported. The overall catalytic cycle can be viewed as a two-stage process that involves water-promoted Si-H bond activation followed by water splitting by a proton transfer. From hydrosilanes to hydrogen: The iridium(III) complex [Ir(H)(CF3SO 3)(NSiN)(coe)] is an effective homogeneous catalyst precursor for hydrogen production from the hydrolysis of hydrosilanes (NSiN=fac-coordinated bis(pyridine-2-yloxy)methylsilyl, coe=cyclooctene).

The hydroxyl radical reaction rate constants and atmospheric reaction products of three siloxanes

The relative rate technique has been used to measure the hydroxyl radical (OH) reaction rate constant of hexamethyldisiloxane (MM, (CH3)3Si-O-Si(CH3)3), octamethyltrisiloxane (MDM, (CH3)3Si-O-Si(CH3)2-O-Si(CH 3)3), and decamethyltetrasiloxane (MD2M, (CH3)3Si-O-Si(CH3)2-O-Si(CH 3)2-O-Si(CH3)3). Hexamethyldisiloxane, octamethyltrisiloxane, and decamethyltetrasiloxane react with OH with bimolecular rate constants of 1.32 ± 0.05 × 10-12 cm3molecule-1s-1, 1.83 ± 0.09 × 10-12 cm3 molecule-1, and 2.66 ±0.13 × 10-12 cm3molecule-1s-1, respectively. Investigation of the OH + siloxane reaction products yielded trimethylsilanol, pentamethyldisiloxanol, heptamethyltetrasiloxanol, hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, and other compounds. Several of these products have not been reported before because these siloxanes and the proposed reaction mechanisms yielding these products are complicated. Some unusual cyclic siloxane products were observed and their formation pathways are discussed in light of current understanding of siloxane atmospheric chemistry.