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71989-14-5 Usage


Fmoc-L-Aspartic acid beta-tert-butyl ester is a synthetic derivative of L-Aspartic acid, a nonessential amino acid that plays a crucial role in the biosynthesis of other amino acids within the human body. The Fmoc (9-fluorenylmethoxycarbonyl) group is a protecting group used in peptide synthesis, while the beta-tert-butyl ester group serves as a temporary protecting group for the carboxylic acid functionality. Fmoc-L-Aspartic acid beta-tert-butyl ester is a white crystalline solid and is soluble in common organic solvents.


Used in Pharmaceutical Industry:
Fmoc-L-Aspartic acid beta-tert-butyl ester is used as a building block in the synthesis of peptides and proteins for various pharmaceutical applications. The Fmoc group allows for the stepwise assembly of peptide chains, while the beta-tert-butyl ester group protects the carboxylic acid group from unwanted side reactions during the synthesis process.
Used in Research and Development:
Fmoc-L-Aspartic acid beta-tert-butyl ester is used as a research tool in the development of new drugs and therapies. It can be incorporated into peptide-based drug candidates to study their biological activity and potential therapeutic effects.
Used in Biochemical Analysis:
Fmoc-L-Aspartic acid beta-tert-butyl ester can be used in biochemical assays and experiments to investigate the role of L-Aspartic acid in various biological processes, such as enzyme catalysis, metabolic pathways, and protein-protein interactions.
Used in Food and Beverage Industry:
Fmoc-L-Aspartic acid beta-tert-butyl ester can be used as a flavor enhancer in the food and beverage industry. L-Aspartic acid is known to enhance the taste of certain foods and beverages, and its derivatives, such as Fmoc-L-Aspartic acid beta-tert-butyl ester, can be used to achieve similar effects.
Used in Cosmetics Industry:
Fmoc-L-Aspartic acid beta-tert-butyl ester can be used in the development of cosmetic products, such as creams, lotions, and serums, to improve skin health and appearance. L-Aspartic acid is known to play a role in collagen synthesis, and its derivatives may have potential benefits for skin rejuvenation and anti-aging treatments.

Check Digit Verification of cas no

The CAS Registry Mumber 71989-14-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,9,8 and 9 respectively; the second part has 2 digits, 1 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 71989-14:
165 % 10 = 5
So 71989-14-5 is a valid CAS Registry Number.

71989-14-5 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
  • Packaging
  • Price
  • Detail
  • TCI America

  • (B3150)  4-tert-Butyl N-[(9H-Fluoren-9-ylmethoxy)carbonyl]-L-aspartate  >98.0%(HPLC)(T)

  • 71989-14-5

  • 5g

  • 460.00CNY

  • Detail
  • TCI America

  • (B3150)  4-tert-Butyl N-[(9H-Fluoren-9-ylmethoxy)carbonyl]-L-aspartate  >98.0%(HPLC)(T)

  • 71989-14-5

  • 25g

  • 1,580.00CNY

  • Detail
  • Alfa Aesar

  • (H59007)  N-Fmoc-L-aspartic acid 4-tert-butyl ester, 98%   

  • 71989-14-5

  • 5g

  • 450.0CNY

  • Detail
  • Alfa Aesar

  • (H59007)  N-Fmoc-L-aspartic acid 4-tert-butyl ester, 98%   

  • 71989-14-5

  • 25g

  • 1605.0CNY

  • Detail
  • Aldrich

  • (47618)  Fmoc-Asp(OtBu)-OH  ≥98.0% (HPLC)

  • 71989-14-5

  • 47618-1G-F

  • 335.79CNY

  • Detail
  • Aldrich

  • (47618)  Fmoc-Asp(OtBu)-OH  ≥98.0% (HPLC)

  • 71989-14-5

  • 47618-10G-F

  • 604.89CNY

  • Detail
  • Aldrich

  • (47618)  Fmoc-Asp(OtBu)-OH  ≥98.0% (HPLC)

  • 71989-14-5

  • 47618-25G-F

  • 1,076.40CNY

  • Detail
  • Aldrich

  • (47618)  Fmoc-Asp(OtBu)-OH  ≥98.0% (HPLC)

  • 71989-14-5

  • 47618-100G-F

  • 3,005.73CNY

  • Detail



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017


1.1 GHS Product identifier

Product name FMOC-L-Aspartic acid β-tert-butyl ester

1.2 Other means of identification

Product number -
Other names Fmoc-L-aspartic acid 4-tert-butyl ester

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:71989-14-5 SDS

71989-14-5Relevant articles and documents



, (2022/03/15)

The present application relates to a novel linker for use in bioconjugation, comprising two or more electrophilic carbon atoms of a carbonyl group, and a click chemistry functional group and, more specifically, to a linker through which a compound, a peptide, and/or a protein can be directly and/or indirectly linked by a substitution reaction to a desired target molecule, that is, a target molecule.

Synthesis of l -octaarginine through microencapsulated palladium-catalyzed allyl ester deprotection

Pérez-López, Ana M.,González-Calderón, Dávir,Occorso, Antonio,Galindo-ángel, Javier,Domínguez-Seglar, José F.,Tamayo, Juan A.,Díaz-Gavilán, Mónica,Gómez-Vidal, José A.

supporting information, p. 2319 - 2322 (2015/08/06)

Octaarginine has been described as a molecular transporter. We report a useful synthesis of orthogonally protected l-octaarginine by using a method based on a microencapsulated palladium catalyst. Known palladium-based methods for allyl ester deprotection have been modified to facilitate purification of the unprotected intermediates. This improvement in the purification step has also been tested with a variety of allyl α-amino esters and allyl α,β-unsaturated esters.

Efficient procedure for the preparation of oligomer-free N-fmoc amino acids

Nowshuddin, Shaik,Rao,Reddy, A. Ram

experimental part, p. 2022 - 2031 (2009/11/30)

A two-step method is presented for the peptide-free, high-purity, and high-yield synthesis of N-Fmoc amino acids. The first step involves the preparation of stable dicyclohexylammonium-amino acid ionic adduct in acetone. Subsequently, the ionic adducts, on reaction with Fmoc-Nosu under mild alkaline conditions, give dipeptide-free N-Fmoc amino acids. The positive charge of the dicyclohexylammonium counterion in the ionic salt has a longer radius, moderating the nucleophilicity of the carboxylate ion of the amino acid and preventing by-products by arresting the formation of mixed anhydrides, the precursors of oligopeptide impurities.

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