56428-93-4

Basic information

• Product Name: Disiloxanol, pentamethyl-
• CAS NO: 56428-93-4
• Molecular Formula: C5H16O2Si2
• Molecular Weight: 164.352
• Mol File: 56428-93-4.mol
• Article Data: 5

Chemical Properties

• CAS DataBase Reference: Disiloxanol, pentamethyl-(CAS DataBase Reference)
• NIST Chemistry Reference: Disiloxanol, pentamethyl-(56428-93-4)
• EPA Substance Registry System: Disiloxanol, pentamethyl-(56428-93-4)

Safety Data

• Hazardous Substances Data: 56428-93-4(Hazardous Substances Data)

Upstream product

• 107-46-0 Hexamethyldisiloxane 
• 1450-14-2 1,1,1,2,2,2-hexamethyldisilane 
• 85461-52-5 1,1,3,3,5,5,5-heptamethyltrisiloxane-1-ol 
• 812-15-7 1,1,1,2,2-pentamethyldisilane 
• 141-62-8 decamethyltetrasiloxane 

Downstream Products

• 141-62-8 decamethyltetrasiloxane 
• 1066-40-6 Trimethylsilanol 
• 85461-52-5 1,1,3,3,5,5,5-heptamethyltrisiloxane-1-ol 
• 2943-62-6 1-chloro-1,1,3,3,3-pentamethyldisiloxane 
• 1234899-30-9 C₁₄H₂₈O₂Si₃ 
• 1234899-21-8 1-(1-heptamethyltrisiloxanyl)-4-{4-ethynyl-2,6-bis(hydroxymethyl)-1-phenoxymethyl}benzene 
• 1234899-31-0 1-(1-heptamethyltrisiloxanyl)-4-{4-(trimethylsiliylethynyl)-2,6-bis(hydroxymethyl)-1-phenoxymethyl}benzene 
• 1234899-29-6 1-heptamethyltrisiloxanyl-4-bromomethylbenzene 
• 78825-01-1 C₁₆H₄₈O₇Si₇ 
• 107-46-0 Hexamethyldisiloxane 
• 107-51-7 octamethyltrisiloxabe 
• 13176-70-0 ethoxy pentamethyldisiloxane 

Relevant articles and documents

Liquid-phase oxidation of pentamethyldisilane with oxygen [3]

-

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.

Reaction of O(3P) with Hexamethyldisilane

The title reaction has been investigated at room temperature in a discharge flow system and also by stationary Hg(3P1)-sensitized N2O photolysis experiments.By far the most important reaction is the insertion of O(3P) atoms into the Si-Si bond yielding a vibrationally excited hexamethyldisiloxane.The rate constant for this reaction has been measured to be (1.3 +/- 0.3) x 10-13 cm3 s-1.The vibrationally excited hexamethyldisiloxane could not be stabilized at pressures up to 1 bar, decomposing mainly by Si-C bond cleavage.A reaction mechanism is proposed to account for the observed products.