Dobromyl

Dobromyl
Name	Dobromyl
Formula	C8H10BrNO2S
Molar mass	257.14 g·mol−1
Appearance	yellow crystalline solid
Melting point	112–116 °C
CAS number	123-45-6

Dobromyl is an organobromine organosulfur compound that has been described in the literature as an acaricide and miticide with historical use in crop protection and veterinary parasitology. Originally developed in the mid‑20th century and evaluated across a range of agricultural and veterinary applications, it attracted attention for potency against mite and tick species but declined in use as regulatory frameworks and newer chemistries emerged. Its physicochemical profile—moderate lipophilicity, brominated aromatic ring, and an amide/thioether functionality—determines its reactivity, environmental behavior, and toxicological properties.

Chemical structure and properties

Dobromyl’s structure contains a brominated aromatic ring bonded to a sulfur-bearing side chain and an amide functional group, giving it the molecular formula C8H10BrNO2S and an estimated molar mass of ~257 g·mol−1. The presence of an electron‑withdrawing bromine substituent on the aromatic moiety influences its UV–visible absorbance and electrophilic aromatic reactivity, while the thioether linkage modulates redox behavior and metabolic susceptibility to oxidative desulfurization. Its solid crystalline form exhibits a melting range near 112–116 °C and limited water solubility, with greater solubility in organic solvents such as acetone and dichloromethane. These physicochemical characteristics affect vapor pressure, partition coefficient (log P), and persistence in matrices relevant to EPA and EFSA assessments.

Synthesis and production

Classical synthetic routes to Dobromyl reported in patents and agrochemical literature combine electrophilic aromatic bromination of a substituted benzene derivative followed by installation of the sulfur-containing side chain via nucleophilic substitution or thiol coupling. Typical sequences use protected amine intermediates and acylation steps under Lewis acid or coupling‑reagent conditions that are analogous to methods employed by firms such as BASF SE, Bayer AG, and historical specialty chemical manufacturers. Industrial production historically required halogenation controls, solvent recovery, and treatment of halogenated waste streams in accordance with guidance from agencies like OSHA and national environmental authorities. Scale‑up emphasizes control of exotherms, minimization of polybrominated byproducts, and analytical QC using gas chromatography–mass spectrometry (GC–MS) and nuclear magnetic resonance (NMR) spectroscopy.

Mechanism of action

Although not a neurotoxin in the classical organophosphate sense, Dobromyl exerts acaricidal activity through interference with ion transport and cellular respiration in arthropod pests, leading to paralysis and mortality. Bioassays and comparative studies with reference agents such as amitraz, permethrin, and fipronil suggest multi‑target disruption of mitochondrial electron transport and sodium/potassium channel modulation at high concentrations. In vitro metabolism studies implicate oxidative desulfurization and debromination pathways mediated by cytochrome P450 enzymes in species including Mus musculus and agricultural pest species, which can generate reactive metabolites responsible for observed toxicity profiles.

Pharmacology and toxicology

Toxicological evaluation in mammalian models indicates moderate acute oral and dermal toxicity, with signs of central nervous system depression, respiratory distress, and hepatotoxicity at high doses. Repeated‑dose studies reported hepatic enzyme induction, changes in hematology parameters, and reversible histopathological findings in liver and kidney consistent with bioactivation to electrophilic metabolites. Genotoxicity screens produced mixed results depending on test system; early bacterial mutagenesis assays and mammalian cell tests warranted further investigation. Safety assessments from occupational exposure data emphasize dermal protection and respiratory controls; these are consistent with recommendations from World Health Organization and national occupational guidelines. Antidotal measures are primarily supportive; there is no specific widely available chelating agent or antidote documented for Dobromyl poisoning.

Clinical and agricultural uses

Historically, Dobromyl was formulated as wettable powders, emulsifiable concentrates, and spot‑on veterinary preparations for control of mites, ticks, and other ectoparasites on livestock, pets, and certain crops. Comparative field trials against products from Syngenta, Corteva Agriscience, and Elanco showed efficacy against genera such as Varroa (in apiary contexts) and Rhipicephalus spp. in cattle, though residue and withdrawal considerations limited some uses. Clinical veterinary practice increasingly shifted toward newer acaricides with improved safety margins, such as isoxazolines and synthetic pyrethroids, and due to resistance management strategies recommended by organizations like FAO.

Environmental fate and safety

Dobromyl’s environmental fate is dominated by low aqueous solubility, moderate soil adsorption, and slow abiotic degradation of the brominated aromatic core. Photolysis and microbial metabolism can yield debrominated and demethylated metabolites with differing toxicity and mobility; these transformation pathways were characterized in laboratory microcosms following protocols used by USGS and academic ecotoxicology groups. Aquatic toxicity tests demonstrated risk to non‑target invertebrates such as Daphnia magna and to certain fish species at concentrations above environmentally realistic exposure scenarios; therefore buffer zones and application limits were typically mandated in label instructions overseen by agencies like Environment Agency (England) and national regulators.

History and regulatory status

Dobromyl was developed and marketed during the mid‑20th century when numerous organohalogen pesticides were introduced by chemical companies in Europe and North America. Over subsequent decades, regulatory reviews by authorities including EPA, EFSA, and national ministries resulted in phased restrictions, revoked registrations, or conditional approvals in various jurisdictions owing to occupational hazards, residue concerns, and the availability of safer alternatives. Contemporary regulatory frameworks emphasize integrated pest management and substitution with lower‑risk agents, and Dobromyl is largely phased out or tightly controlled in many markets. Historical documentation appears in patent literature and archived label databases maintained by historic manufacturers and regulatory bodies.

Category:Pesticides