370886

1,1,1,3,5,5,5-Heptamethyltrisiloxane

97%

• Synonym(s): 2,2,4,6,6-Pentamethyl-3,5-dioxa-2,4,6-trisilaheptane, 2-Hydro-1,1,1,2,3,3,3-heptamethyltrisiloxane, Bis(trimethylsiloxy)methylsilane, Heptamethylhydrotrisiloxane, Methylbis(trimethylsiloxy)silane
• Linear Formula: [(CH₃)₃SiO]₂SiHCH₃
• CAS Number: 1873-88-7
• Molecular Weight: 222.50
• Beilstein/REAXYS Number: 1748455
• EC Number: 217-496-1
• MDL number: MFCD00048000
• UNSPSC Code: 12352103
• PubChem Substance ID: 24863086
• NACRES: NA.22

Properties

• assay: 97%
• refractive index: n20/D 1.382 (lit.)
• bp: 142 °C (lit.)
• density: 0.819 g/mL at 25 °C (lit.)
• SMILES string: C[SiH](O[Si](C)(C)C)O[Si](C)(C)C
• InChI: 1S/C7H22O2Si3/c1-10(8-11(2,3)4)9-12(5,6)7/h10H,1-7H3
• InChI key: QNWOFLWXQGHSRH-UHFFFAOYSA-N

Description

Application

1,1,1,3,5,5,5-Heptamethyltrisiloxane can be used for the aromatic C-H silylation of arenes in the presence of a platinum complex catalyst.
It can also be used as a reagent to synthesize:

• 3-Octyl-1,1,1,3,5,5,5-heptamethyltrisiloxane, an agricultural adjuvant and sensory performance enhancer used in cosmetic formulations.
• Isoindigo-based conjugated polymer with siloxane-terminated solubilizing group.
• Monosiloxy esters with a variety of acids.

Safety Information

• pictograms: GHS02,GHS07
• signalword: Danger
• hcodes: H225,H315,H319,H335
• pcodes: P210 - P302 + P352 - P305 + P351 + P338
• Hazard Classifications: Eye Irrit. 2 - Flam. Liq. 2 - Skin Irrit. 2 - STOT SE 3
• target_organs: Respiratory system
• Storage Class: 3 - Flammable liquids
• wgk_germany: WGK 3
• flash_point_f: 71.6 °F - closed cup
• flash_point_c: 22 °C - closed cup
• ppe: Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter