CAS 6166-86-5

Pentamethylcyclopentasiloxane

Description:

Pentamethylcyclopentasiloxane, with the CAS number 6166-86-5, is a cyclic siloxane compound characterized by its unique structure, which consists of a five-membered ring containing silicon and oxygen atoms. This compound features five methyl groups attached to the silicon atoms, contributing to its hydrophobic properties and low surface tension. Pentamethylcyclopentasiloxane is typically colorless and odorless, exhibiting a low viscosity and high thermal stability, making it suitable for various applications in cosmetics, personal care products, and industrial formulations. Its chemical stability and resistance to degradation under environmental conditions enhance its utility in formulations requiring long-lasting performance. Additionally, it is known for its ability to impart a silky feel and improve the spreadability of products. However, like many siloxanes, its environmental impact and potential bioaccumulation are subjects of ongoing research and regulatory scrutiny. Overall, pentamethylcyclopentasiloxane is valued for its functional properties in enhancing product performance while being mindful of environmental considerations.

Formula: C₅H₂₀O₅Si₅

InChI: InChI=1S/C5H20O5Si5/c1-11-6-12(2)8-14(4)10-15(5)9-13(3)7-11/h11-15H,1-5H3

InChI key: InChIKey=HGPDWMTUQRNTQT-UHFFFAOYSA-N

SMILES: C[SiH]1O[SiH](C)O[SiH](C)O[SiH](C)O[SiH](C)O1

Synonyms:

• 1,3,5,7,9-Pentamethylcyclopentasiloxane
• 2,2,4,4,6-Pentamethyl-1,3,5,7,9,2,4,6,8,10-Pentoxapentasilecane
• 2,4,6,8,10-Pentamethyl-1,3,5,7,9,2,4,6,8,10-Pentoxapentasilecane
• 2,4,6,8,10-Pentamethyl-1,3,5,7,9,2,4,6,8,10-Pentoxapentasilecane-2,4,6,8,10-Pentayl
• 2,4,6,8,10-Pentamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane
• 2,4,6,8,10-Pentamethylcyclopentasiloxan
• 2,4,6,8,10-Pentamethylcyclopentasiloxane
• 2,4,6,8,10-Pentametilciclopentasiloxano
• Cyclopentasiloxane, 2,4,6,8,10-pentamethyl-
• Cyclopentasiloxane, Pentamethyl-
• Ls 8990

1,3,5,7,9-Pentamethylcyclopentasiloxane, 90%

CAS: 6166-86-5

S25341 - 1,3,5,7,9-Pentamethylcyclopentasiloxane, 90%

Formula: C₅H₂₀O₅Si₅

Purity: 90%

Color and Shape: Liquid, Clear

Molecular weight: 300.635

Ref: 10-S25341

1,3,5,7,9-PENTAMETHYLCYCLOPENTASILOXANE, 90%

CAS: 6166-86-5

Siloxane-Based Silane Reducing Agent
Organosilanes are hydrocarbon-like and possess the ability to serve as both ionic and free-radical reducing agents. These reagents and their reaction by-products are safer and more easily handled and disposed than many other reducing agents. The metallic nature of silicon and its low electronegativity relative to hydrogen lead to polarization of the Si-H bond yielding a hydridic hydrogen and a milder reducing agent compared to aluminum-, boron-, and other metal-based hydrides. A summary of some key silane reductions are presented in Table 1 of the Silicon-Based Reducing Agents brochure.
1,3,5,7,9-Pentamethylcyclopentasiloxane; D'5; Methyl hydrogen cyclic pentamer; 2,4,6,8,10-Pentamethylcyclopentasiloxane
ΔHvap: 47.3 kJ/molContains other cyclic homologsExtensive review of silicon based reducing agents: Larson, G.; Fry, J. L. "Ionic and Organometallic-Catalyzed Organosilane Reductions", Wipf, P., Ed.; Wiley, 2007

Formula: C₅H₂₀O₅Si₅

Purity: 90%

Color and Shape: Liquid

Molecular weight: 300.64

Ref: 3H-SIP6718.0