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Sigma-Aldrich

DCA Deblock (0.36M dichloroacetic acid in toluene)

Synonym(s):

DCA Deblock, DEBLOCK (0.36M dichloroacetic acid in toluene)

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About This Item

Empirical Formula (Hill Notation):
C2H2Cl2O2
CAS Number:
79-43-6
Molecular Weight:
128.94
MDL number:
MFCD00004223
UNSPSC Code:
12352106
PubChem Substance ID:
329762686

form

liquid

Quality Level

100

concentration

≤100 ppm in H2O

bp

110-111 °C

density

0.884 g/mL at 25 °C

SMILES string

OC(=O)C(Cl)Cl

InChI

1S/C2H2Cl2O2/c3-1(4)2(5)6/h1H,(H,5,6)

InChI key

JXTHNDFMNIQAHM-UHFFFAOYSA-N

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General description

Deblock solution, containing dichloroacetic acid (DCA) in dichloromethane or Toluene, removes the dimethoxytrityl (DMT) protecting the group from the 5′ hydroxyl moiety of nucleotides already incorporated into the growing nucleic acid, prior to the addition of the next phosphoramidite. Removal of the DMT allows the unprotected 5′ hydroxyl moiety to react with a new phosphoramidite in a subsequent extension reaction.

Application

DCA Deblock (0.36M dichloroacetic acid in toluene) is suitable for the removal of 4,4Adimethoxytrityl (DMTr) protecting groups for the synthesis of antisense oligonucleotides in high yield and purity.

Signal Word

Danger

Hazard Classifications

Aquatic Chronic 3 - Asp. Tox. 1 - Carc. 2 - Eye Dam. 1 - Flam. Liq. 2 - Lact. - Repr. 1B - Skin Irrit. 2 - STOT RE 2 Inhalation - STOT SE 3

Target Organs

Central nervous system

Storage Class Code

3 - Flammable liquids

WGK

WGK 3

Flash Point(F)

41.0 °F

Flash Point(C)

5 °C

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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A H Krotz et al.
Bioorganic & medicinal chemistry, 7(3), 435-439 (1999-04-29)
It is demonstrated that a solution of dichloroacetic acid in toluene removes dimethoxytrityl groups from the 5'-terminus of an antisense phosphorothioate oligodeoxyribonucleotide (ISIS 5132/CGP69846A) during synthesis on solid support cleanly and efficiently. It is therefore suggested to replace health hazardous
Synthesis of an antisense oligonucleotide targeted against C-raf kinase: efficient oligonucleotide synthesis without chlorinated solvents
A H Krotz and D L Cole V T Ravikumar
Bioorganic & Medicinal Chemistry, 7(3), 435-439 (1999)
Yi-Hsueh Chuang et al.
Water research, 47(3), 1308-1316 (2013-01-05)
The direct incorporation of chloramines and dissolved organic nitrogen (DON) may provide the nitrogen for nitrogenous disinfection byproducts (N-DBPs). This study explores the contributions of natural DON and chloramine incorporation to the formation of N-DBPs during chloramination. This study also
Mehdi D Esrafili
Journal of molecular modeling, 18(12), 5005-5016 (2012-06-28)
A theoretical study was performed to examine hydrogen and halogen bonds properties in gas phase and crystalline dichloroacetic acid (DCAA). The specific pattern of O-H∙∙∙O, C-H∙∙∙O, HCl, Cl∙∙∙O and Cl∙∙∙Cl interactions in DCAA dimers is described within the quantum theory
Yong Won Choi et al.
Cancer letters, 346(2), 300-308 (2014-02-01)
To investigate sensitization of metformin-cytotoxicity, cancer cells were treated with dichloroacetate (DCA), an inhibitor of pyruvate dehydrogenase kinase (PDK). Metformin-cytotoxicity was mainly dependent on glucose availability and reducing power generated by pentose phosphate pathway, whereas DCA cotreatment enhanced metformin-cytotoxicity via
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