EDDHA
{{chembox
| Verifiedfields = changed
| verifiedrevid = 477166938
| ImageFile=EDDHA.png
| ImageClass = skin-invert-image
| ImageSize=200px
| IUPACName=2-[2-
| OtherNames=Ethylenediamine-N,N'-bis(2-hydroxyphenylacetic acid
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 13782
| InChI = 1/C18H20N2O6/c21-13-7-3-1-5-11(13)15(17(23)24)19-9-10-20-16(18(25)26)12-6-2-4-8-14(12)22/h1-8,15-16,19-22H,9-10H2,(H,23,24)(H,25,26)
| InChIKey = PZZHMLOHNYWKIK-UHFFFAOYAQ
| SMILES1 = O=C(O)C(NCCNC(c1ccccc1O)C(=O)O)c2ccccc2O
| ChEMBL_Ref = {{ebicite|correct|EBI}}
| ChEMBL = 21178
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/C18H20N2O6/c21-13-7-3-1-5-11(13)15(17(23)24)19-9-10-20-16(18(25)26)12-6-2-4-8-14(12)22/h1-8,15-16,19-22H,9-10H2,(H,23,24)(H,25,26)
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = PZZHMLOHNYWKIK-UHFFFAOYSA-N
| CASNo_Ref = {{cascite|changed|??}}
| CASNo=1170-02-1
| PubChem=14432
| SMILES=C1=CC=C(C(=C1)C(C(=O)O)NCCNC(C2=CC=CC=C2O)C(=O)O)O
}}
|Section2={{Chembox Properties
| C=18 | H=20 | N=2 | O=6
| Appearance= White solid
| Density=
| MeltingPt=
| BoilingPt=
| Solubility=
}}
|Section3={{Chembox Hazards
| MainHazards=
| FlashPt=
| AutoignitionPt =
}}
}}
EDDHA or ethylenediamine-N,{{prime|N}}-bis(2-hydroxyphenylacetic acid) is a chelating agent. Like EDTA, it binds metal ions as a hexadentate ligand, using two amines, two phenolate centers, and two carboxylates as the six binding sites. The complexes are typically anionic. The ligand itself is a white, water-soluble powder. Both the free ligand and its tetraanionic chelating agent are abbreviated EDDHA. In contrast to EDDHA, most related aminopolycarboxylic acid chelating agents feature tertiary amines and few have phenolate groups.
:File:EFOREWdownC2.png{{clear-left}}
Preparation
It is produced by the multicomponent reaction of phenol, glyoxalic acid, and ethylenediamine. In this process, the initial Schiff base condensate alkylates the phenol.{{cite journal|title=Structure and Fertilizer Properties of Byproducts Formed in the Synthesis of EDDHA|author1=Hernandez-Apaolaza, Lourdes |author2=Garcia-Marco, Sonia |author3=Nadal, Paloma |author4=Lucena, Juan J. |author5=Sierra, Miguel A. |author6=Gomez-Gallego, Mar |author7=Ramirez-Lopez, Pedro |author8=Escudero, Rosa |journal=Journal of Agricultural and Food Chemistry|year=2006|volume=54|issue=12|pages=4355–4363|doi=10.1021/jf0605749|pmid=16756367 }} Related ligands can be prepared more efficiently using para-cresol.{{cite journal|title=Chelating Agents Related to Ethylenediamine Bis(2-hydroxyphenyl)acetic Acid (EDDHA): Synthesis, Characterization, and Equilibrium Studies of the Free Ligands and Their Mg2+, Ca2+, Cu2+, and Fe3+ Chelates|author1=Yunta, Felipe |author2=Garcia-Marco, Sonia |author3=Lucena, Juan J. |author4=Gomez-Gallego, Mar |author5=Alcazar, Roberto |author6=Sierra, Miguel A. |journal=Inorganic Chemistry|year=2003|volume=42|issue=17 |pages=5412–5421|doi=10.1021/ic034333j|pmid=12924915}}
Uses
It is used to mobilize metal ions analogously to the use of EDTA.{{cite journal |vauthors=Diarra MS, Petitclerc D, Lacasse P |title=Response of Staphylococcus aureus isolates from bovine mastitis to exogenous iron sources |journal=J. Dairy Sci. |volume=85 |issue=9 |pages=2141–8 |year=2002 |pmid=12362445 |doi=10.3168/jds.S0022-0302(02)74292-6|doi-access=free }}{{cite journal |vauthors=Sritharan M, Asuthkar S |title=Iron-regulated proteins (IRPS) of leptospira biflexa serovar Patoc strain Patoc I |journal=Indian Journal of Medical Microbiology |volume=22 |issue=2 |pages=92–6 |year=2004 |doi=10.1016/S0255-0857(21)02887-5 |pmid=17642703 |doi-access=free }}
EDDHA has been used in phytoextraction of lead from contaminated soils.{{cite journal|title=Phytoremediation of Lead-Contaminated Soils: Role of Synthetic Chelates in Lead Phytoextraction |author1=Huang, Jianwei W. |author2=Chen, Jianjun |author3=Berti, William R. |author4=Cunningham, Scott D. |journal=Environmental Science and Technology|year=1997|volume=31|issue=3|pages=800–805|doi=10.1021/ES9604828|bibcode=1997EnST...31..800H}} It degrades with release of salicylic acid.{{cite journal|title=Is flowering in Lemnaceae stress-induced? A review|author=Pieterse, Arnold H.|journal=Aquatic Botany|year=2013|volume=104|pages=1–4|doi=10.1016/j.aquabot.2012.08.002}}