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Sigma-Aldrich

2-tert-Butyl-1,1,3,3-tetramethylguanidine

≥97.0% (GC)

Synonym(s):

BTMG

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About This Item

Empirical Formula (Hill Notation):
C9H21N3
CAS Number:
29166-72-1
Molecular Weight:
171.28
Beilstein:
2352408
MDL number:
MFCD01862972
UNSPSC Code:
12352100
PubChem Substance ID:
57647848
NACRES:
NA.22
Pricing and availability is not currently available.

Quality Level

200

Assay

≥97.0% (GC)

form

liquid

refractive index

n20/D 1.457

bp

88-89 °C/43 mmHg (lit.)

functional group

amine

SMILES string

CN(C)\C(=N/C(C)(C)C)N(C)C

InChI

1S/C9H21N3/c1-9(2,3)10-8(11(4)5)12(6)7/h1-7H3

InChI key

YQHJFPFNGVDEDT-UHFFFAOYSA-N

General description

2-tert-Butyl-1,1,3,3-tetramethylguanidine (Barton′s base) is an excellent alternative to traditional inorganic bases for promoting the coupling reaction[1].

Application

  • Synthesis of dinaphthyl ethers: Barton′s base, which includes 2-tert-Butyl-1,1,3,3-tetramethylguanidine, was utilized to promote SNAr reactions for the synthesis of highly oxygenated dinaphthyl ethers, demonstrating its efficacy as a catalyst in complex organic synthesis processes (Wipf and Lynch, 2003).

Caution

Remark on appearance: Material may form precipitate on storage. The precipitate may easily be separated by filtration.

Pictograms

CorrosionExclamation mark
GHS05,GHS07

Signal Word

Danger

Hazard Statements

H302,H314

Hazard Classifications

Acute Tox. 4 Oral - Skin Corr. 1B

Storage Class Code

8A - Combustible corrosive hazardous materials

WGK

WGK 3

Flash Point(F)

149.0 °F - closed cup

Flash Point(C)

65.0 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
BCCL4795
BCCL4270
BCCL2982
BCCK9721
BCCK8110

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D.H.R. Barton et al.
Organic Syntheses, 74, 103-103 (1997)
Peter Wipf et al.
Organic letters, 5(7), 1155-1158 (2003-03-28)
[reaction: see text] Electron-rich dinaphthyl ethers were synthesized by S(N)Ar reactions between naphthols and activated fluoronaphthalenes. 2-tert-Butyl-1,1,3,3-tetramethylguanidine (Barton's base) was found to be an excellent, mild alternative to traditional inorganic bases for promoting the coupling reaction.

Questions

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

    1 answer

    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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