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660159

Sigma-Aldrich

NaK Silica gel (Na2K) Stage I

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

Synonym(s):

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

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About This Item

CAS Number:
11135-81-2
MDL number:
MFCD00134088
UNSPSC Code:
12352300
PubChem Substance ID:
329760147

vapor pressure

0 mmHg ( 20 °C)

form

solid

autoignition temp.

248-257 °F

reaction suitability

reagent type: reductant

extent of labeling

~35 wt. % Na-K loading

density

0.87 g/mL at 25 °C

InChI

1S/K.Na

InChI key

BITYAPCSNKJESK-UHFFFAOYSA-N

Application

Alkali Metal Silica Gels from SiGNa
Alternative to other reagents for desulfurizations, dehalogenations(as Wurtz coupling reactions), and Birch reductions.[1]

Additionally can be used as:
  • A reducing agent for aliphatic ester substrates[2]
  • A deprotectant in place of the typical heavy metal deprotectant[3]

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Certificates of Analysis (COA)

Lot/Batch Number
13619LD
12419LD
12119LD

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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).

Questions

1–2 of 2 Questions  

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

    1 answer

    1. 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.

      Helpful?

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

    1 answer

    1. 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.

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