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660175

Sigma-Aldrich

Sodium silica gel Stage II

extent of labeling: ~35 wt. % Na-K loading

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Synonym(s):
Na-SG-II
MDL number:
MFCD01941718
UNSPSC Code:
11101527
NACRES:
NA.22

form

solid

autoignition temp.

248-257 °F

reaction suitability

reagent type: reductant

extent of labeling

~35 wt. % Na-K loading

density

0.7 g/mL at 25 °C

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Application

Alkali Metal Silica Gels from SiGNa
Mild reducing agent capable of reducing alcohols, useful for drying and purifying organic solvents, producing hydrogen from water for hydrogenation chemistry.

Alternative to other reagents for desulfurizations, dehalogenations(as Wurtz coupling reactions), and Birch reductions.

Additionally can be used as:
  • A reducing agent for aliphatic ester substrates
A deprotectant in place of the typical heavy metal deprotectant

Pictograms

FlameCorrosion
GHS02,GHS05

Signal Word

Danger

Hazard Statements

H261,H314

Hazard Classifications

Eye Dam. 1 - Skin Corr. 1B - Water-react 2

Supplementary Hazards

EUH014

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Regulatory Information

新产品

Certificates of Analysis (COA)

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  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. How do I find price and availability?

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  4. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  5. What is the difference between the NaK Silica gels (Na2K) , for example Stage I or Stage II?

    These alkali silica gels, which are offered by Sigma-Aldrich for SiGNa Chemistry, can reduce some of the handling precautions traditionally associated with alkali metals, while still retaining the reducing power of the parent alkali.They are classified into three categories. Stage 0 powders, like 660140 or 660159, are air-sensitive, but can easily be used in continuous-flow applications. Stage I powders, like 660167, are non-pyrophoric and dry air-stable; they can be stored for months without any change in reducing capacity. Stage II powders are easily handled in an open ambient environment, but readily react with water to produce stoichiometric yields of pure hydrogen gas. Stage II powders function well as a hydrogen source or drying agent.

  6. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

P. Nandi, et al.,
Tetrahedron Letters, 50, 3864-3866 (2009)
P. F. Vogt and B. Bodnar,
Spec. Chem., 29, 22-24 (2009)
Dye, J. L. et al
Journal of the American Chemical Society, 127, 9339-9339 (2005)

Articles

Alkali Metal Silica Gels from SiGNa

SiGNa Chemistry has recently developed a technology for encapsulating alkali metals into nano-structured porous oxides to create stable, free flowing powders with varying reactivities (based on the intended application).

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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