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660159 Aldrich

NaK Silica gel (Na2K) Stage I

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

Synonym: Na2K-SG-I, Sodium-potassium alloy on silica gel (Na2K)

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Properties

Related Categories Alkali Metals, Chemical Synthesis, Reduction, Synthetic Reagents
vapor pressure   0 mmHg ( 20 °C)
InChI Key   BITYAPCSNKJESK-UHFFFAOYSA-N
autoignition temp.   248-257 °F
extent of labeling   ~35 wt. % Na-K loading
density   0.87 g/mL at 25 °C

Description

Frequently Asked Questions

Frequently Asked Questions are available for this Product.

Application

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

Alkali Metal Silica Gels from SiGNa

Packaging

5, 25 g in glass bottle

Price and Availability

Safety & Documentation

Safety Information

Symbol 
Signal word 
Danger
Hazard statements 
Supplemental Hazard Statements 
Reacts violently with water.
RIDADR 
UN 3404 4.3 / PGI
WGK Germany 
1

Frequently Asked Questions

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. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
How do I get lot-specific information or a Certificate of Analysis?
A Certificate of Analysis is available by lot number and can be obtained through our Advanced Search Option: http://www.sigmaaldrich.com/catalog/AdvancedSearchPage.do
How do I find price and availability?
There are several ways to find pricing and availability for our products.  Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers. 
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, or search here. 
My question is not addressed here, how can I contact Technical Service for assistance?
Use the option to the right to "Ask a Question" by email of a Technical Service Scientist.
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.
Where can I find more information on the possible applications of these alkali metal silica gels?
Please visit the following link for further information and literature references pertaining to these products: http://www.sigmaaldrich.com/chemistry/chemical-synthesis/technology-spotlights/alkali-silica-gels.html
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Protocols & Articles

Articles

Alkali Metal Silica Gels from SiGNa

Alkali metals have long been used in synthetic chemistry as reducing agents, but their pyrophoric nature has often prevented their use in larger-scale reactions. Alkali metals react violently with wa...
Keywords: Birch Reduction, Bouveault-Blanc Reduction, Green chemistry, Reductions, transformation

Alkali Silica Gels

Alkali metals have long been used in synthetic chemistry as reducing agents, but their pyrophoric nature has often prevented their use in larger-scale reactions. Alkali metals react violently with wa...
ChemFiles Volume 5 Article 9
Keywords: Applications, Birch Reduction, Coupling reactions, Reductions, Solvents, Wurtz reaction

Related Content

Alkali Metal Silica Gels from SiGNa: Powerful Reducing Agents

Alkali metals have long been used in synthetic chemistry as reducing agents, but their pyrophoric nature has often prevented their use in larger-scale reactions. Alkali metals react violently with wa...
Keywords: Applications, Birch Reduction, Bouveault-Blanc Reduction, Green chemistry, Reductions, Solvents, transformation

Peer-Reviewed Papers
15

References

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