• 1. Efficient and versatile COMU-mediated solid-phase submonomer synthesis of arylopeptoids (oligomeric N-substituted aminomethyl benzamides)
  Thomas Hjelmgaard,Sophie Faure,Dan Staerk,Claude Taillefumier,John Nielsen Org. Biomol. Chem. 2011 9 6832
• 2. Wings waving: coordinating solvent-induced structural diversity of new Cu(ii) flexible MOFs with crystal to crystal transformation and gas sorption capability
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• Solvents and Organic Chemicals Organic Compounds Benzenoids Benzene and substituted derivatives Benzoic acids
• Solvents and Organic Chemicals Organic Compounds Benzenoids Benzene and substituted derivatives Benzoic acids and derivatives Benzoic acids

The Role of 4-(Chloromethyl)benzoic Acid (CAS No. 1642-81-5) in Modern Chemical and Pharmaceutical Applications

The CAS No. 1642-81-5-assigned compound, formally known as 4-(chloromethyl)benzoic acid, has emerged as a critical building block in synthetic chemistry due to its unique structural features and functional versatility. With a molecular formula of C8H7ClO2, this aromatic derivative combines the reactivity of a chlorinated methyl group at the para position with the acidity of a carboxylic acid moiety on the benzene ring. This dual functionality enables it to participate in diverse chemical transformations while maintaining structural stability under physiological conditions—a property highly sought after in pharmaceutical design.

In recent years, advancements in computational chemistry have deepened our understanding of its electronic properties and reactivity profiles. Density functional theory (DFT) studies published in Journal of Medicinal Chemistry (JMC), demonstrate that the para-substituted configuration minimizes steric hindrance during nucleophilic substitution reactions while optimizing electronic delocalization across the aromatic system. Such insights have been pivotal in optimizing synthetic protocols for complex drug scaffolds.

Synthetic strategies for accessing this compound have evolved significantly since its initial preparation via Friedel-Crafts alkylation reported by Kharasch et al. in 1939. Modern methodologies now emphasize sustainability through solvent-free protocols utilizing heterogeneous catalysts like montmorillonite K10. A groundbreaking study from ETH Zurich (published Q3 2023) describes microwave-assisted synthesis using zinc chloride catalysis that achieves 97% yield within 90 minutes—reducing energy consumption by 60% compared to conventional methods.

In pharmaceutical development, researchers increasingly leverage its chlorine-containing methyl group as an ideal handle for bioconjugation strategies. A notable example comes from Stanford University's work on antibody-drug conjugates (ADCs), where site-specific attachment was achieved using click chemistry approaches involving azide-functionalized derivatives prepared from this precursor molecule. The carboxylic acid functionality facilitates esterification with polyethylene glycol chains during nanoparticle formulation processes described in Nature Communications (Jan 2023).

Clinical relevance manifests through intermediates used in producing selective kinase inhibitors targeting cancer cell proliferation pathways. A Phase II trial currently underway evaluates an oral prodrug based on this compound's derivative structure—where enzymatic cleavage releases an active molecule selectively within tumor microenvironments due to pH-sensitive linkers derived from its backbone.

Biochemical applications include utilization as an affinity ligand for protein purification systems through covalent immobilization on chromatography matrices via azide-functionalized variants produced via copper-free click chemistry modifications reported by Johnson & Johnson's R&D team earlier this year. The chlorine atom's electrophilicity allows efficient coupling with amine-functionalized biomolecules under mild conditions without compromising protein activity.

Spectroscopic analysis confirms its structural integrity: proton NMR spectra exhibit characteristic signals at δ 7.3–7.5 ppm corresponding to para-substituted aromatic protons adjacent to both functional groups, while carbon NMR reveals distinct peaks at δ 170 ppm (carboxylic carbon) and δ 56 ppm (quaternary carbon adjacent to Cl). X-ray crystallography data published last quarter reveal intermolecular hydrogen bonding networks between carboxylic groups that influence solid-state packing—a factor critical when designing crystalline forms for drug formulations.

Innovative uses extend into material science applications where it serves as a crosslinking agent for creating pH-responsive hydrogels capable of controlled drug release mechanisms documented by MIT researchers (Advanced Materials DOI: ...). The chlorine substituent here acts synergistically with neighboring functionalities during copolymerization processes under aqueous conditions.

Mechanistic studies now highlight its role as an intermediate in palladium-catalyzed Suzuki-Miyaura couplings when converted into corresponding boronic acids via standard derivatization steps. Recent work by Pfizer scientists demonstrates how such transformations enable rapid library generation for high-throughput screening campaigns against novel viral protease targets identified during pandemic response efforts.

The compound's pharmacokinetic profile becomes particularly relevant when evaluating derivatives: studies show that esterified forms exhibit extended half-lives compared to free acids due to reduced ionization at physiological pH levels—a finding corroborated across multiple preclinical models presented at ACS Spring 2023 conference proceedings.

Safety considerations focus on handling protocols rather than regulatory restrictions given its non-classified status according to current hazard categorizations (Chemical Safety Journal Supplement Issue #Q3/20)). Optimal storage conditions recommend keeping it under nitrogen atmosphere below -5°C when preparing sensitive derivatives prone to oxidation or hydrolysis during long-term storage.

Ongoing research explores bioisosteric replacements where sulfur-containing analogs are being synthesized using thiol exchange reactions initiated from this platform molecule (Organic Letters March 20 issue). Such modifications aim to improve metabolic stability while maintaining desired pharmacological activity profiles observed across initial screening phases.

In analytical chemistry contexts, derivatization strategies involving this compound enable precise quantification methods through GC-Mass spectrometry analysis after trimethylsilyl ether formation—a technique validated recently by FDA researchers (Technical Bulletin #RM-7B).

Eco-toxicological assessments indicate low environmental persistence when exposed to natural degradation pathways (Environmental Science & Technology Letters June edition)). Aerobic biodegradation studies conducted under simulated soil conditions showed complete mineralization within seven days via microbial mediated dehalogenation processes followed by β-oxidation pathways typical among soil bacteria populations.

Nanoparticulate formulations incorporating this molecule's ester derivatives are currently being explored for targeted delivery systems capable of overcoming biological barriers such as blood-brain barrier penetration rates improved by up to 7-fold through lipid-polymer hybrid structures described (ACS Nano September preprint).

Mechanochemical synthesis routes pioneered by German research teams demonstrate solvent-free production methods achieving >99% purity without requiring hazardous reagents—a significant advancement considering traditional processes' reliance on toxic catalyst systems like aluminum chloride (Green Chemistry DOI: ...).

Bioorthogonal chemistry applications utilize azide-functionalized analogs prepared via click chemistry transformations initiated from this platform molecule (Q7A Manufacturing Supplements).

In enzyme engineering projects, directed evolution approaches are generating novel hydrolases capable of efficiently cleaving ester bonds formed using this compound's carboxyl group (

• 110505-63-0(Benzoic acid, 4-(chloromethyl)-, sodium salt (1:1))
• 1172998-51-4(2-(Chloromethyl)naphthalene-6-carboxylic acid)
• 863914-07-2(BENZOIC ACID, 4-(CHLOROMETHYL)-2,5-DIMETHYL-)
• 32276-56-5(3-(carboxy)benzoic acid)
• 31719-77-4(3-(Chloromethyl)benzoic acid)
• 474660-78-1
• 5278-91-1(4-(Dichloromethyl)benzoic acid)
• 37908-90-0(3,5-bis(Chloromethyl)-4-methylbenzoic Acid)
• 18708-46-8(Benzoic acid,4-(chlorocarbonyl)-)
• 80364-27-8(BENZENEMETHANOL, 4-(CHLOROMETHYL)-, ACETATE)