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Sigma-Aldrich

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

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About This Item

Linear Formula:
[(CH3)3SiO]2SiHCH3
CAS Number:
1873-88-7
Molecular Weight:
222.50
Beilstein:
1748455
EC Number:
217-496-1
MDL number:
MFCD00048000
UNSPSC Code:
12352103
PubChem Substance ID:
24863086
NACRES:
NA.22
Pricing and availability is not currently available.

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

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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.[1]
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.[2]
  • Isoindigo-based conjugated polymer with siloxane-terminated solubilizing group.[3]
  • Monosiloxy esters with a variety of acids.[4]

Pictograms

FlameExclamation mark
GHS02,GHS07

Signal Word

Danger

Hazard Statements

H225,H315,H319,H335

Hazard Classifications

Eye Irrit. 2 - Flam. Liq. 2 - Skin Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

3 - Flammable liquids

WGK

WGK 3

Flash Point(F)

71.6 °F - closed cup

Flash Point(C)

22 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
12311AD
14718HC
10204KB
07526BC
07108LU

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Platinum-catalyzed aromatic C-H silylation of arenes with 1, 1, 1, 3, 5, 5, 5-Heptamethyltrisiloxane
Murata M, et al.
Chemistry Letters (Jpn), 36(7), 910-911 (2007)
Iron catalysts for selective anti-Markovnikov alkene hydrosilylation using tertiary silanes
Tondreau AM, et al.
Science (New York, N.Y.), 335(6068), 567-570 (2012)
Siloxane-terminated solubilizing side chains: bringing conjugated polymer backbones closer and boosting hole mobilities in thin-film transistors
Mei J, et al.
Journal of the American Chemical Society, 133(50), 20130-20133 (2011)
An efficient Pd-catalyzed route to silyl esters
Chauhan M, et al.
Organic Letters, 2(8), 1027-1029 (2000)
Kairui Liu et al.
Nature communications, 10(1), 996-996 (2019-03-03)
While numerous single atoms stabilized by support surfaces have been reported, the synthesis of in-situ reduced discrete metal atoms weakly coordinated and stabilized in liquid media is a more challenging goal. We report the genesis of mononuclear electron deficient Pt1(0)

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  1. How is shipping temperature determined? And how is it related to the product storage temperature?

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    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  2. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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