Tmic
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Record Information
Version2.0
Creation Date2009-06-17 23:53:03 UTC
Update Date2014-12-24 20:23:00 UTC
Accession NumberT3D0968
Identification
Common NameFenobucarb
ClassSmall Molecule
DescriptionFenobucarb is a carbamate pesticide. Carbamate pesticides are derived from carbamic acid and kill insects in a similar fashion as organophosphate insecticides. They are widely used in homes, gardens and agriculture. The first carbamate, carbaryl, was introduced in 1956 and more of it has been used throughout the world than all other carbamates combined. Because of carbaryl's relatively low mammalian oral and dermal toxicity and broad control spectrum, it has had wide use in lawn and garden settings. Most of the carbamates are extremely toxic to Hymenoptera, and precautions must be taken to avoid exposure to foraging bees or parasitic wasps. Some of the carbamates are translocated within plants, making them an effective systemic treatment. (3)
Compound Type
  • Amine
  • Carbamate
  • Ester
  • Ether
  • Organic Compound
  • Pesticide
  • Synthetic Compound
Chemical Structure
Thumb
Synonyms
Synonym
2-(1-Methylpropyl)phenyl methylcarbamate
2-(Butan-2-yl)phenyl methylcarbamate
2-Butylphenyl methylcarbamate
2-Sec-butylphenyl methylcarbamate
2-sec-Butylphenyl N-methylcarbamate
Barizon
Bassa
Baycarb
BPMC
Carbamic acid, methyl-, O-sec-butylphenyl ester
Carvil
Fenobcarb
Geocarb 50EC
Methylcarbamic acid O-sec-butylphenyl ester
O-sec-butylphenyl methylcarbamate
Chemical FormulaC12H17NO2
Average Molecular Mass207.269 g/mol
Monoisotopic Mass207.126 g/mol
CAS Registry Number3766-81-2
IUPAC Name2-(butan-2-yl)phenyl N-methylcarbamate
Traditional Namebassa
SMILESCCC(C)C1=CC=CC=C1OC(=O)NC
InChI IdentifierInChI=1S/C12H17NO2/c1-4-9(2)10-7-5-6-8-11(10)15-12(14)13-3/h5-9H,4H2,1-3H3,(H,13,14)
InChI KeyInChIKey=DIRFUJHNVNOBMY-UHFFFAOYSA-N
Chemical Taxonomy
Description belongs to the class of organic compounds known as phenyl methylcarbamates. These are aromatic compounds containing a methylcarbamic acid esterified with a phenyl group.
KingdomOrganic compounds
Super ClassBenzenoids
ClassBenzene and substituted derivatives
Sub ClassPhenyl methylcarbamates
Direct ParentPhenyl methylcarbamates
Alternative Parents
Substituents
  • Phenyl methylcarbamate
  • Phenylpropane
  • Phenoxy compound
  • Carbamic acid ester
  • Carbonic acid derivative
  • Organic nitrogen compound
  • Organic oxygen compound
  • Organopnictogen compound
  • Organic oxide
  • Hydrocarbon derivative
  • Organooxygen compound
  • Organonitrogen compound
  • Carbonyl group
  • Aromatic homomonocyclic compound
Molecular FrameworkAromatic homomonocyclic compounds
External Descriptors
Biological Properties
StatusDetected and Not Quantified
OriginExogenous
Cellular Locations
  • Membrane
Biofluid LocationsNot Available
Tissue LocationsNot Available
PathwaysNot Available
Applications
Biological Roles
Chemical Roles
Physical Properties
StateSolid
AppearanceWhite powder.
Experimental Properties
PropertyValue
Melting Point31.5°C
Boiling PointNot Available
Solubility0.42 mg/mL at 20°C [TOMLIN,C (1994)]
LogPNot Available
Predicted Properties
PropertyValueSource
Water Solubility0.14 g/LALOGPS
logP3.06ALOGPS
logP3.16ChemAxon
logS-3.1ALOGPS
pKa (Strongest Acidic)14.77ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count1ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area38.33 ŲChemAxon
Rotatable Bond Count4ChemAxon
Refractivity59.56 m³·mol⁻¹ChemAxon
Polarizability23.08 ųChemAxon
Number of Rings1ChemAxon
Bioavailability1ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectra
Spectra
Spectrum TypeDescriptionSplash Key
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-0pb9-6950000000-c0f435cfe1148918d9f3View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-0zgi-6900000000-3612d61adeea313fb11aView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-0a4i-9200000000-5e0116b71e8a8e78dd1fView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-0a4i-9550000000-cef6a7e293fd89699c21View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-0a4j-8910000000-1deb7ebd44ca178b194cView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0a4j-9700000000-bd676d158439086dc60dView in MoNA
MSMass Spectrum (Electron Ionization)splash10-00di-2900000000-ca6ba9bf1ddd912dd93fView in MoNA
1D NMR1H NMR SpectrumNot AvailableView in JSpectraViewer
1D NMR13C NMR SpectrumNot AvailableView in JSpectraViewer
Toxicity Profile
Route of ExposureInhalation (2) ; oral (2); dermal (2)
Mechanism of ToxicityFenobucarb is a cholinesterase or acetylcholinesterase (AChE) inhibitor. Carbamates form unstable complexes with chlolinesterases by carbamoylation of the active sites of the enzymes. This inhibition is reversible. A cholinesterase inhibitor suppresses the action of acetylcholine esterase. Because of its essential function, chemicals that interfere with the action of acetylcholine esterase are potent neurotoxins, causing excessive salivation and eye-watering in low doses. Headache, salivation, nausea, vomiting, abdominal pain and diarrhea are often prominent at higher levels of exposure. Acetylcholine esterase breaks down the neurotransmitter acetylcholine, which is released at nerve and muscle junctions, in order to allow the muscle or organ to relax. The result of acetylcholine esterase inhibition is that acetylcholine builds up and continues to act so that any nerve impulses are continually transmitted and muscle contractions do not stop.
MetabolismThe carbamates are hydrolyzed enzymatically by the liver; degradation products are excreted by the kidneys and the liver. (2)
Toxicity ValuesNot Available
Lethal DoseNot Available
Carcinogenicity (IARC Classification)No indication of carcinogenicity to humans (not listed by IARC).
Uses/SourcesFenobucarb is widely used as an insecticide or pesticide in homes, gardens and agricultural applications. It is a synthetic compound.
Minimum Risk LevelNot Available
Health EffectsAcute exposure to cholinesterase inhibitors can cause a cholinergic crisis characterized by severe nausea/vomiting, salivation, sweating, bradycardia, hypotension, collapse, and convulsions. Increasing muscle weakness is a possibility and may result in death if respiratory muscles are involved. Accumulation of ACh at motor nerves causes overstimulation of nicotinic expression at the neuromuscular junction. When this occurs symptoms such as muscle weakness, fatigue, muscle cramps, fasciculation, and paralysis can be seen. When there is an accumulation of ACh at autonomic ganglia this causes overstimulation of nicotinic expression in the sympathetic system. Symptoms associated with this are hypertension, and hypoglycemia. Overstimulation of nicotinic acetylcholine receptors in the central nervous system, due to accumulation of ACh, results in anxiety, headache, convulsions, ataxia, depression of respiration and circulation, tremor, general weakness, and potentially coma. When there is expression of muscarinic overstimulation due to excess acetylcholine at muscarinic acetylcholine receptors symptoms of visual disturbances, tightness in chest, wheezing due to bronchoconstriction, increased bronchial secretions, increased salivation, lacrimation, sweating, peristalsis, and urination can occur. Chronically high (>10 years) exposure leads to neuropsychological consequences including disturbances in perception and visuo-motor processing (1).
SymptomsAs with organophosphates, the signs and symptoms are based on excessive cholinergic stimulation. Unlike organophosphate poisoning, carbamate poisonings tend to be of shorter duration because the inhibition of nervous tissue acetylcholinesterase is reversible, and carbamates are more rapidly metabolized. Muscle weakness, dizziness, sweating and slight body discomfort are commonly reported early symptoms. Headache, salivation, nausea, vomiting, abdominal pain and diarrhea are often prominent at higher levels of exposure. Contraction of the pupils with blurred vision, incoordination, muscle twitching and slurred speech have been reported. (3)
TreatmentIf the compound has been ingested, rapid gastric lavage should be performed using 5% sodium bicarbonate. For skin contact, the skin should be washed with soap and water. If the compound has entered the eyes, they should be washed with large quantities of isotonic saline or water. In serious cases, atropine and/or pralidoxime should be administered. Anti-cholinergic drugs work to counteract the effects of excess acetylcholine and reactivate AChE. Atropine can be used as an antidote in conjunction with pralidoxime or other pyridinium oximes (such as trimedoxime or obidoxime), though the use of '-oximes' has been found to be of no benefit, or possibly harmful, in at least two meta-analyses. Atropine is a muscarinic antagonist, and thus blocks the action of acetylcholine peripherally.
Normal Concentrations
Not Available
Abnormal Concentrations
Not Available
DrugBank IDNot Available
HMDB IDNot Available
PubChem Compound ID19588
ChEMBL IDNot Available
ChemSpider IDNot Available
KEGG IDC14425
UniProt IDNot Available
OMIM ID
ChEBI ID34304
BioCyc IDCPD-10489
CTD IDC019276
Stitch IDFenobucarb
PDB IDNot Available
ACToR IDNot Available
Wikipedia LinkNot Available
References
Synthesis ReferenceNot Available
MSDST3D0968.pdf
General References
  1. Roldan-Tapia L, Nieto-Escamez FA, del Aguila EM, Laynez F, Parron T, Sanchez-Santed F: Neuropsychological sequelae from acute poisoning and long-term exposure to carbamate and organophosphate pesticides. Neurotoxicol Teratol. 2006 Nov-Dec;28(6):694-703. Epub 2006 Aug 30. [17029710 ]
  2. IPCS Intox Database (1987). Antimony pentoxide. [Link]
  3. Fishel F (2009). Pesticide Toxicity Profile: Carbamate Pesticides. University of Florida, IFAS Extension. [Link]
Gene Regulation
Up-Regulated GenesNot Available
Down-Regulated GenesNot Available

Targets

General Function:
Serine hydrolase activity
Specific Function:
Terminates signal transduction at the neuromuscular junction by rapid hydrolysis of the acetylcholine released into the synaptic cleft. Role in neuronal apoptosis.
Gene Name:
ACHE
Uniprot ID:
P22303
Molecular Weight:
67795.525 Da
References
  1. Fishel F (2009). Pesticide Toxicity Profile: Carbamate Pesticides. University of Florida, IFAS Extension. [Link]
General Function:
Identical protein binding
Specific Function:
Esterase with broad substrate specificity. Contributes to the inactivation of the neurotransmitter acetylcholine. Can degrade neurotoxic organophosphate esters.
Gene Name:
BCHE
Uniprot ID:
P06276
Molecular Weight:
68417.575 Da
References
  1. Fishel F (2009). Pesticide Toxicity Profile: Carbamate Pesticides. University of Florida, IFAS Extension. [Link]