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EC number: 257-848-1 | CAS number: 52320-66-8
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- (Q)SAR
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification
- Justification for type of information:
- QMRF report has been attached
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 201 (Alga, Growth Inhibition Test)
- Principles of method if other than guideline:
- Prediction was done using the OECD QSAR toolbox version 3.4
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- - Name of test material (IUPAC name): 2-[(E)-2-(4-chloro-2-nitrophenyl)diazen-1-yl]-N-(4-ethoxyphenyl)-3-oxobutanamide
- Molecular formula: C18H17ClN4O5
- Molecular weight: 404.808 g/mol
- Smiles notation: O=C(Nc1ccc(OCC)cc1)[C@@H](\N=N\c1c([N+](=O)[O-])cc(cc1)Cl)C(=O)C
- InChl: 1S/C18H17ClN4O5/c1-3-28-14-7-5-13(6-8-14)20-18(25)17(11(2)24)22-21-15-9-4-12(19)10-16(15)23(26)27/h4-10,17H,3H2,1-2H3,(H,20,25)/b22-21+
- Substance type: Organic
- Physical state: Solid - Analytical monitoring:
- not specified
- Vehicle:
- not specified
- Test organisms (species):
- Raphidocelis subcapitata (previous names: Pseudokirchneriella subcapitata, Selenastrum capricornutum)
- Test type:
- static
- Water media type:
- freshwater
- Total exposure duration:
- 72 h
- Hardness:
- 24 mg CaCO3/L
- Test temperature:
- 21.2 - 23.3 °C
- pH:
- 8.0 - 8.2
- Nominal and measured concentrations:
- Estimated data
- Reference substance (positive control):
- not specified
- Key result
- Duration:
- 72 h
- Dose descriptor:
- EC50
- Effect conc.:
- 0.286 mg/L
- Nominal / measured:
- estimated
- Conc. based on:
- not specified
- Basis for effect:
- growth rate
- Remarks on result:
- other: Other details not known
- Validity criteria fulfilled:
- not specified
- Conclusions:
- Based on the growth rate inhibition, the EC50 value was estimated to be 0.28 mg/l when 2-[(E)-2-(4-chloro-2-nitrophenyl)diazen-1-yl]-N- (4-ethoxyphenyl)-3-oxobutanamide exposed to Pseudokirchneriella subcapitata for 72 hrs.
- Executive summary:
Based on the prediction done using the OECD QSAR toolbox version 3.4 with log kow as the primary descriptor and considering the six closest read across substances, toxicity on Pseudokirchneriella subcapitata (previous names: Raphidocelis subcapitata, Selenastrum capricornutum) was predicted for 2-[(E)-2-(4-chloro-2-nitrophenyl) diazen-1-yl]-N- (4-ethoxyphenyl)-3-oxobutanamide (52320-66-8). Based on the growth rate inhibition, the EC50 value was estimated to be 0.28 mg/l when 2-[(E)-2-(4-chloro-2-nitrophenyl)diazen-1-yl]-N- (4-ethoxyphenyl)-3-oxobutanamide exposed to Pseudokirchneriella subcapitata for 72 hrs. Based on this value it can be concluded that the substance 2 -[(E)-2-(4-chloro-2-nitrophenyl) diazen-1-yl]-N-(4-ethoxyphenyl)-3-oxobutanamide (52320-66-8) is considered to be toxic to aquatic environment and classified as aquatic acute 1 as well as chronic 1 category as per the criteria mentioned in CLP regulation.
Reference
The
prediction was based on dataset comprised from the following
descriptors: EC50
Estimation method: Takes average value from the 5 nearest neighbours
Domain logical expression:Result: In Domain
((((((((((((((((("a"
or "b" or "c" or "d" or "e" )
and ("f"
and (
not "g")
)
)
and ("h"
and (
not "i")
)
)
and ("j"
and (
not "k")
)
)
and ("l"
and (
not "m")
)
)
and ("n"
and (
not "o")
)
)
and ("p"
and (
not "q")
)
)
and ("r"
and (
not "s")
)
)
and ("t"
and (
not "u")
)
)
and ("v"
and (
not "w")
)
)
and ("x"
and (
not "y")
)
)
and ("z"
and (
not "aa")
)
)
and ("ab"
and (
not "ac")
)
)
and "ad" )
and "ae" )
and ("af"
and (
not "ag")
)
)
and ("ah"
and "ai" )
)
Domain
logical expression index: "a"
Referential
boundary: The
target chemical should be classified as Radical AND Radical >> Radical
mechanism via ROS formation (indirect) AND Radical >> Radical mechanism
via ROS formation (indirect) >> Nitroarenes with Other Active Groups AND
SN1 AND SN1 >> Nucleophilic attack after diazonium or carbenium ion
formation AND SN1 >> Nucleophilic attack after diazonium or carbenium
ion formation >> Nitroarenes with Other Active Groups AND SN1 >>
Nucleophilic attack after reduction and nitrenium ion formation AND SN1
>> Nucleophilic attack after reduction and nitrenium ion formation >>
Nitroarenes with Other Active Groups AND SN2 AND SN2 >> SN2 attack on
activated carbon Csp3 or Csp2 AND SN2 >> SN2 attack on activated carbon
Csp3 or Csp2 >> Nitroarenes with Other Active Groups by DNA binding by
OASIS v.1.4
Domain
logical expression index: "b"
Referential
boundary: The
target chemical should be classified as SN1 AND SN1 >> Nitrenium Ion
formation AND SN1 >> Nitrenium Ion formation >> Aromatic azo AND SN1 >>
Nitrenium Ion formation >> Aromatic nitro by DNA binding by OECD
Domain
logical expression index: "c"
Referential
boundary: The
target chemical should be classified as Acylation AND Acylation >>
Acylation involving an activated (glucuronidated) carboxamide group AND
Acylation >> Acylation involving an activated (glucuronidated)
carboxamide group >> Carboxylic Acid Amides AND Acylation >> Direct
acylation involving a leaving group AND Acylation >> Direct acylation
involving a leaving group >> Carboxylic Acid Amides AND Acylation >>
Ester aminolysis AND Acylation >> Ester aminolysis >> Amides AND AN2 AND
AN2 >> Michael-type addition to quinoid structures AND AN2 >>
Michael-type addition to quinoid structures >> Carboxylic Acid Amides
by Protein binding by OASIS v1.4
Domain
logical expression index: "d"
Referential
boundary: The
target chemical should be classified as Acylation AND Acylation >>
Direct Acylation Involving a Leaving group AND Acylation >> Direct
Acylation Involving a Leaving group >> Acetates AND SN2 AND SN2 >> SN2
reaction at sp3 carbon atom AND SN2 >> SN2 reaction at sp3 carbon atom
>> Alkyl diazo by Protein binding by OECD
Domain
logical expression index: "e"
Referential
boundary: The
target chemical should be classified as Amides by Aquatic toxicity
classification by ECOSAR
Domain
logical expression index: "f"
Referential
boundary: The
target chemical should be classified as Non binder, without OH or NH2
group by Estrogen Receptor Binding
Domain
logical expression index: "g"
Referential
boundary: The
target chemical should be classified as Non binder, impaired OH or NH2
group by Estrogen Receptor Binding
Domain
logical expression index: "h"
Referential
boundary: The
target chemical should be classified as Non binder, without OH or NH2
group by Estrogen Receptor Binding
Domain
logical expression index: "i"
Referential
boundary: The
target chemical should be classified as Weak binder, OH group by
Estrogen Receptor Binding
Domain
logical expression index: "j"
Referential
boundary: The
target chemical should be classified as Acylation AND Acylation >>
Acylation involving an activated (glucuronidated) carboxamide group AND
Acylation >> Acylation involving an activated (glucuronidated)
carboxamide group >> Carboxylic Acid Amides AND Acylation >> Direct
acylation involving a leaving group AND Acylation >> Direct acylation
involving a leaving group >> Carboxylic Acid Amides AND Acylation >>
Ester aminolysis AND Acylation >> Ester aminolysis >> Amides AND AN2 AND
AN2 >> Michael-type addition to quinoid structures AND AN2 >>
Michael-type addition to quinoid structures >> Carboxylic Acid Amides
by Protein binding by OASIS v1.4
Domain
logical expression index: "k"
Referential
boundary: The
target chemical should be classified as Radical reactions >> ROS
generation and direct attack of hydroxyl radical to the C8 position of
nucleoside base OR Radical reactions >> ROS generation and direct attack
of hydroxyl radical to the C8 position of nucleoside base >>
Heterocyclic Aromatic Amines OR SE reaction (CYP450-activated
heterocyclic amines) OR SE reaction (CYP450-activated heterocyclic
amines) >> Direct attack of arylnitrenium cation to the C8 position of
nucleoside base OR SE reaction (CYP450-activated heterocyclic amines)
>> Direct attack of arylnitrenium cation to the C8 position of
nucleoside base >> Heterocyclic Aromatic Amines OR SR reaction
(peroxidase-activated heterocyclic amines) OR SR reaction
(peroxidase-activated heterocyclic amines) >> Direct attack of
arylnitrenium radical to the C8 position of nucleoside base OR SR
reaction (peroxidase-activated heterocyclic amines) >> Direct attack of
arylnitrenium radical to the C8 position of nucleoside base >>
Heterocyclic Aromatic Amines by Protein binding by OASIS v1.4
Domain
logical expression index: "l"
Referential
boundary: The
target chemical should be classified as Acylation AND Acylation >>
Direct Acylation Involving a Leaving group AND Acylation >> Direct
Acylation Involving a Leaving group >> Acetates AND SN2 AND SN2 >> SN2
reaction at sp3 carbon atom AND SN2 >> SN2 reaction at sp3 carbon atom
>> Alkyl diazo by Protein binding by OECD
Domain
logical expression index: "m"
Referential
boundary: The
target chemical should be classified as Acylation >> Ring Opening
Acylation >> alpha-Lactams by Protein binding by OECD
Domain
logical expression index: "n"
Referential
boundary: The
target chemical should be classified as Amides by Aquatic toxicity
classification by ECOSAR
Domain
logical expression index: "o"
Referential
boundary: The
target chemical should be classified as Acid moiety by Aquatic toxicity
classification by ECOSAR
Domain
logical expression index: "p"
Referential
boundary: The
target chemical should be classified as Amides by Aquatic toxicity
classification by ECOSAR
Domain
logical expression index: "q"
Referential
boundary: The
target chemical should be classified as Alkoxy Silanes by Aquatic
toxicity classification by ECOSAR
Domain
logical expression index: "r"
Referential
boundary: The
target chemical should be classified as Amides by Aquatic toxicity
classification by ECOSAR
Domain
logical expression index: "s"
Referential
boundary: The
target chemical should be classified as Carbonyl Ureas by Aquatic
toxicity classification by ECOSAR
Domain
logical expression index: "t"
Referential
boundary: The
target chemical should be classified as Amides by Aquatic toxicity
classification by ECOSAR
Domain
logical expression index: "u"
Referential
boundary: The
target chemical should be classified as Hydrazines by Aquatic toxicity
classification by ECOSAR
Domain
logical expression index: "v"
Referential
boundary: The
target chemical should be classified as Amides by Aquatic toxicity
classification by ECOSAR
Domain
logical expression index: "w"
Referential
boundary: The
target chemical should be classified as Phenol Amines by Aquatic
toxicity classification by ECOSAR
Domain
logical expression index: "x"
Referential
boundary: The
target chemical should be classified as Amides by Aquatic toxicity
classification by ECOSAR
Domain
logical expression index: "y"
Referential
boundary: The
target chemical should be classified as Substituted Ureas by Aquatic
toxicity classification by ECOSAR
Domain
logical expression index: "z"
Referential
boundary: The
target chemical should be classified as Halogens AND Non-Metals by
Groups of elements
Domain
logical expression index: "aa"
Referential
boundary: The
target chemical should be classified as Metalloids by Groups of elements
Domain
logical expression index: "ab"
Referential
boundary: The
target chemical should be classified as Alkoxy AND Aryl AND Aryl halide
AND Azo AND Ether AND Ketone AND Nitrobenzene AND Organic amide and
thioamide by Organic Functional groups
Domain
logical expression index: "ac"
Referential
boundary: The
target chemical should be classified as Alcohol by Organic Functional
groups
Domain
logical expression index: "ad"
Similarity
boundary:Target:
CCOc1ccc(NC(=O)C(C(C)=O)N=Nc2ccc(Cl)cc2N(=O)=O)cc1
Threshold=20%,
Dice(Atom centered fragments)
Atom type; Count H attached; Hybridization
Domain
logical expression index: "ae"
Similarity
boundary:Target:
CCOc1ccc(NC(=O)C(C(C)=O)N=Nc2ccc(Cl)cc2N(=O)=O)cc1
Threshold=40%,
Dice(Atom centered fragments)
Atom type; Count H attached; Hybridization
Domain
logical expression index: "af"
Referential
boundary: The
target chemical should be classified as (!Undefined)Group All Lipid
Solubility < 0.01 g/kg AND (!Undefined)Group CNHal Lipid Solubility < 4
g/kg AND (!Undefined)Group CNHal Lipid Solubility < 400 g/kg AND Group
All Melting Point > 200 C AND Group CNHal Aqueous Solubility < 0.001 g/L
AND Group CNHal Aqueous Solubility < 0.1 g/L AND Group CNHal log Kow >
3.8 AND Group CNHal Molecular Weight > 370 g/mol AND Group CNHal
Molecular Weight > 380 g/mol by Skin irritation/corrosion Exclusion
rules by BfR
Domain
logical expression index: "ag"
Referential
boundary: The
target chemical should be classified as Group All log Kow > 9 by Skin
irritation/corrosion Exclusion rules by BfR
Domain
logical expression index: "ah"
Parametric
boundary:The
target chemical should have a value of log Kow which is >= 0.0716
Domain
logical expression index: "ai"
Parametric
boundary:The
target chemical should have a value of log Kow which is <= 8.45
Description of key information
Based on the prediction done using the OECD QSAR toolbox version 3.4 with log kow as the primary descriptor and considering the six closest read across substances, toxicity on Pseudokirchneriella subcapitata (previous names: Raphidocelis subcapitata, Selenastrum capricornutum) was predicted for 2-[(E)-2-(4-chloro-2-nitrophenyl) diazen-1-yl]-N- (4-ethoxyphenyl)-3-oxobutanamide (52320-66-8). Based on the growth rate inhibition, the EC50 value was estimated to be 0.28 mg/l when 2-[(E)-2-(4-chloro-2-nitrophenyl)diazen-1-yl]-N- (4-ethoxyphenyl)-3-oxobutanamide exposed to Pseudokirchneriella subcapitata for 72 hrs. Based on this value it can be concluded that the substance 2 -[(E)-2-(4-chloro-2-nitrophenyl) diazen-1-yl]-N-(4-ethoxyphenyl)-3-oxobutanamide (52320-66-8) is considered to be toxic to aquatic environment and classified as aquatic acute 1 as well as chronic 1 category as per the criteria mentioned in CLP regulation.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 0.28 mg/L
Additional information
Various predicted data for the target compound 2-[(E)-2-(4-chloro-2-nitrophenyl) diazen-1-yl]-N-(4-ethoxyphenyl)-3-oxobutanamide (52320-66-8) and experimental studies for supporting weight of evidence studies for its closest read across substance with log Kow as the primary descriptor and on the basis of structural and functional similarity were reviewed for the toxicity on the algal end point which are summarized as below:
In a prediction done by SSS (2017), based on the prediction done using the OECD QSAR toolbox version 3.4 with log kow as the primary descriptor and considering the six closest read across substances, toxicity on Pseudokirchneriella subcapitata (previous names: Raphidocelis subcapitata, Selenastrum capricornutum) was predicted for 2-[(E)-2-(4-chloro-2- nitrophenyl) diazen-1-yl]-N- (4-ethoxyphenyl)-3-oxobutanamide (52320-66-8). Based on the growth rate inhibition, the EC50 value was estimated to be 0.28 mg/l when 2-[(E)-2-(4-chloro- 2-nitrophenyl)diazen-1-yl]-N- (4-ethoxyphenyl)-3-oxobutanamide exposed to Pseudokirchneriella subcapitata for 72 hrs. Based on this value it can be concluded that the substance 2 -[(E)-2-(4-chloro-2-nitrophenyl) diazen-1-yl]-N-(4-ethoxyphenyl)-3-oxobutanamide (52320-66-8) is considered to be toxic to aquatic environment and classified as aquatic acute 1 as well as chronic 1 category as per the criteria mentioned in CLP regulation.
First predicted study was supported by the structurally and functionally similar read across chemical (103-90-2) from Environmental Toxicology and Chemistry 2006. Aim of the study was to assess the effect of chemical 4' Hydroxyacetanilidon (Acetaminophen) on the growth of freshwater alga Selenastrum capricornutum for the exposure period of 72 hrs. Testing was conducted according to the published Environment Canada biological test method. Test chemical was analytically monitored by HPLC method and also separation done by reverse-phase column using binary gradient elution at a constant temperature of 25°C. The neutral drugs were analyzed individually by full-scan MS in positive-ion mode, and quantitative analyses were performed using selective-ion monitoring mode. Algae exposed for chemical for 72 hrs and effect was observed based on the inhibition of algal cell inhibition. Based on the inhibition of the number of living algal cells and biomass of Pseudokirchneriella subcapitala (S. capricornutum) the IC25 was >0.032 mg/l. Thus based on the IC25, it can be concluded that the chemical was toxic and can be consider to be classified as aquatic acute 1 as well as chronic 1 category as per the CLP classification criteria.
Similarly in a supporting weight of evidence study for read across chemical (50-65-7) from ECOTOX database 2018 study was conducted. Study was conducted to determine the short term toxicity of 5-Chloro-N-(2-chloro-4-nitrophenyl)-2-hydroxybenzamide to algae Scenedesmus subspicatus (Green Algae). Test was conducted under the static system for the total exposure period of 48 hrs. Based on the biomass inhibition of green algae (Scenedesmus subspicatus) due to the chemical 5-Chloro-N-(2-chloro-4-nitrophenyl)-2-hydroxybenzamide exposure for 48 hrs, the EC50 was 0.96 mg/l. Thus based on the EC50 chemical was consider as toxic and can be consider to be classified as aquatic acute1/chronic 1 category as per the CLP classification criteria.
On the basis of above results for target chemical 2-[(E)-2-(4-chloro-2-nitrophenyl)diazen-1-yl]-N-(4-ethoxyphenyl)-3-oxobutanamide (52320-66-8) (from OECD QSAR toolbox version 3.4) and for its read across substance from Environmental Toxicology and Chemistry 2006 and ECOTOX database it can be concluded that the test substance 2-[(E)-2-(4-chloro-2- nitrophenyl)diazen-1-yl]-N-(4-ethoxyphenyl)-3-oxobutanamide (52320-66-8) is toxic and can be consider to be classified as aquatic acute1/chronic 1 category as per the CLP classification criteria.
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