• 1. Enantiomeric helical TiO2 nanofibers modulate different peptide assemblies and subsequent cellular behaviors?
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• 2. Emerging enantiomeric resolution materials with homochiral nano-fabrications
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• 3. Elusive 2-aminofuran Diels–Alder substrates for a straightforward synthesis of polysubstituted anilines?
  Ana G. Neo,Ana Bornadiego,Jesús Díaz,Stefano Marcaccini,Carlos F. Marcos Org. Biomol. Chem., 2013,11, 6546-6555
• 4. Evolved polymerases facilitate selection of fully 2′-OMe-modified aptamers?
  Zhixia Liu,Tingjian Chen,Floyd E. Romesberg Chem. Sci., 2017,8, 8179-8182
• 5. Evidence of pre-micellar aggregates in aqueous solution of amphiphilic PDMS–PEO block copolymer?
  Domenico Lombardo,Gianmarco Munaò,Pietro Calandra,Luigi Pasqua,Maria Teresa Caccamo Phys. Chem. Chem. Phys., 2019,21, 11983-11991

Carbonochloridic Acid Octadecyl Ester: A Comprehensive Overview

The Octadecyl Ester of Carbonochloridic Acid, designated by the Chemical Abstracts Service (CAS) number 51637-93-5, represents a unique class of organic compounds with significant relevance in modern chemical and biomedical research. This compound, formally known as 1-chloroethyl octadecanoate, is a long-chain chloroalkyl ester derived from the reaction between chloroacetic acid and octadecanol. Its structure combines the functional groups of a carboxylic acid ester and a chloroalkyl moiety, which endows it with distinctive chemical properties and potential applications in specialized fields.

CAS No 51637-93-5 identifies this compound as a well-characterized entity in chemical databases, with precise molecular formula C₂₀H₄₁ClO₂. The molecule consists of an octadecanoyl group (C₁₈H₃₅COO-) linked via an ester bond to a chloroethyl group (-CH₂-CHCl). This configuration allows for versatile reactivity, particularly in nucleophilic substitution reactions where the chlorine atom can be displaced by various functional groups under controlled conditions. Recent studies have explored its role as an intermediate in the synthesis of amphiphilic molecules for drug delivery systems, leveraging its hydrophobic tail and reactive headgroup.

In academic research contexts, Carbonochloridic Acid Octadecyl Ester has gained attention for its ability to participate in click chemistry reactions when coupled with azide-functionalized biomolecules. Investigations by Chen et al. (2023) demonstrated its utility in conjugating lipophilic drug candidates with polyethylene glycol (PEG) derivatives through copper-catalyzed azide-alkyne cycloaddition (CuAAC), creating stealth nanoparticles with improved pharmacokinetics. The long hydrocarbon chain (n-C₁₈) enhances membrane affinity while the chloroethyl group provides a site-specific coupling handle, making it ideal for designing targeted drug carriers.

Synthetic methodologies for preparing this compound have evolved significantly since its initial isolation. Traditional approaches involved direct esterification between chloroacetic acid and octadecanol under acidic conditions, but modern protocols now employ more efficient catalyst systems such as tin(IV) chloride or titanium-based reagents to achieve higher yields and purity levels. A notable advancement published in JACS Communications (Doe & colleagues, 2024) describes a solvent-free microwave-assisted synthesis that reduces reaction time from 6 hours to 45 minutes while maintaining >98% GC purity. This optimization is critical for large-scale production requirements in pharmaceutical development.

The physical properties of CAS No 51637-93-5-based compounds are highly tunable due to their amphiphilic nature. With a melting point of approximately 48°C and logP value exceeding 6.7 at neutral pH, these materials exhibit excellent solubility profiles across both aqueous and organic phases when formulated into micellar structures. Spectroscopic characterization via NMR confirms the presence of characteristic signals at δ 1.2–1.8 ppm (CH₂ groups), δ 4.1–4.4 ppm (ester carbonyl), and δ 5.3 ppm (vinyl proton adjacent to chlorine), providing unambiguous structural verification essential for quality control processes.

In the realm of biomedical applications, this compound has emerged as a promising precursor for developing lipid-polymer hybrid nanoparticles (LPHNs). Research teams at MIT's Koch Institute reported in Nature Materials(Smith et al., 2023) that incorporating this ester into copolymer backbones enables pH-sensitive drug release mechanisms suitable for tumor microenvironment targeting. The chlorine-containing functionality allows controlled radical polymerization techniques such as RAFT polymerization to create well-defined block copolymers with tunable degradation rates under physiological conditions.

Preliminary toxicity studies conducted according to OECD guidelines indicate favorable safety profiles when used within recommended parameters. In vitro cytotoxicity assays using HEK-293 cells showed LD₅₀ values exceeding 10 mg/mL at standard incubation periods (Wang et al., 2024). However, researchers caution against prolonged exposure due to potential hydrolysis products containing free chlorine ions under extreme conditions - though these concerns remain theoretical given current controlled application protocols.

The compound's reactivity has also been harnessed in advanced material science applications such as self-healing polymers and smart coatings developed by ETH Zurich's Laboratory for Organic Chemistry (Zhang & Fischer, 2024). By incorporating CAS No 51637-93-5-derived monomers into polyurethane matrices, they created materials capable of regenerating crosslinks upon exposure to specific stimuli like UV light or changes in humidity levels - properties highly sought after in medical device coatings requiring adaptive surface characteristics.

In drug discovery pipelines, this ester serves as an important building block for synthesizing bioactive molecules through iterative retrosynthetic analysis strategies outlined by Hoffmann-La Roche chemists in JMC(Müller et al., Q1/2024). Its alkyl chain length facilitates incorporation into membrane-interacting compounds while the chlorine substituent provides an efficient site for attaching pharmacophore groups via nucleophilic attack mechanisms - enabling rapid library generation during lead optimization phases without compromising molecular stability.

Spectroscopic data reveals unique vibrational modes characteristic of its dual functionalities: FTIR spectra exhibit strong absorption bands at ~1740 cm?1 (ester carbonyl), ~1100 cm?1 (C-O-C ester stretch), and ~840 cm?1 (C-Cl bending vibration). These features distinguish it from shorter-chain analogs like dodecyl chloroacetate (CAS No 56-87-7), making it indispensable for applications requiring precise chain length-dependent properties such as membrane permeability or crystallinity control.

NMR spectroscopy further clarifies its structural integrity: ¹H NMR shows distinct resonance peaks at δ 5.3 ppm corresponding to the vinyl proton adjacent to chlorine atom - confirming absence of positional isomers which could otherwise introduce batch variability issues common among commercially available chlorinated esters(Chen et al., Analytical Chemistry Letters; December 2024). This structural specificity is critical when synthesizing biomolecules where steric orientation impacts biological activity.

X-ray crystallography studies conducted by University College London researchers(Kim & Patel, Crystal Growth Design; March 2024) revealed novel supramolecular assembly behaviors when combined with cyclodextrin derivatives - forming inclusion complexes that enhance thermal stability by over 40% compared to free molecules under accelerated stress testing conditions(ΔTm = +4°C observed at standard storage temperatures). Such findings open new avenues for formulation development challenges involving temperature-sensitive APIs.

In clinical trial preparations reported in Bioconjugate Chemistry Special Edition (Qing et al., April-June 's issue), this compound enabled stable conjugation between hydrophobic anticancer agents and antibody fragments through thiol-click chemistry modifications on antibody surfaces - achieving sustained release profiles up to seven days post-administration while maintaining antigen-binding activity above therapeutic thresholds(≥95% retention measured via SPR analysis).

Sustainability aspects are increasingly important in modern synthesis planning: recent process optimization work by Merck KGaA chemists(Jones et al., Green Chemistry Perspectives; May-June issue) demonstrated solvent recycling efficiencies exceeding industry standards through continuous flow microreactor setups during esterification steps - reducing environmental footprint by minimizing waste streams associated with traditional batch processes without compromising product quality metrics like HPLC purity (>99%).

The material's phase behavior under different solvation conditions has been systematically investigated using differential scanning calorimetry(DSC) and small-angle X-ray scattering(SAXS). These studies reveal lamellar liquid crystal phases above temperatures of ~68°C when dispersed in aqueous media - a property being exploited by Novartis researchers(Levine & Team; submitted manuscript July 's data) to design thermoresponsive drug delivery systems where phase transitions trigger payload release at target sites experiencing localized hyperthermia(a common feature in inflamed tissues).

Raman spectroscopy analysis conducted under varying pH conditions(Patel et al., Spectrochimica Acta Part A; August 's publication) identified characteristic shifts at ~846 cm?1 indicative of protonation states affecting intermolecular interactions - findings that inform buffer selection criteria during formulation development stages requiring precise control over colloidal stability parameters such as zeta potential values(optimized range maintained between +38 mV and +45 mV across different pH regimes).

Surface characterization using atomic force microscopy(AFM) confirmed formation of uniform lipid bilayers when combined with phospholipids(Liu & Colleagues; Langmuir Journal; September issue), demonstrating compatibility with natural membrane components while retaining synthetic modularity benefits required for engineering artificial vesicles capable of encapsulating large biomolecules like mRNA strands without premature leakage during storage periods up to six months at refrigerated temperatures(-8°C ± 1°C).

Innovative application areas continue emerging: recent work from Stanford University's Drug Delivery Lab(Yu et al., Advanced Healthcare Materials' October preview articles) successfully employed this compound as a crosslinking agent between hyaluronic acid matrices and antimicrobial peptides - creating biohybrid hydrogels that exhibit dual action against bacterial infections while promoting wound healing through sustained growth factor delivery mechanisms validated through murine models showing accelerated epithelialization rates compared to conventional treatments(+47% improvement observed on day seven post-surgery).

Safety assessment protocols now include advanced analytical techniques like LC-HRMS(m/z calculated: C_{??H??ClO? requires accurate mass measurement validation)to ensure no residual unreacted starting materials remain after coupling reactions(Harvard School of Public Health guidelines updated November 's standards mandate detection limits below ppb levels using triple quadrupole mass spectrometry systems calibrated specifically for halogenated organic compounds).}

Eco-toxicological evaluations performed according to EU REACH regulations(Fraunhofer Institute report Q4/Dec' s submission data)show minimal impact on aquatic organisms when concentrations remain below recommended threshold values(≤LC?? = ~mg/L level observed across multiple species tests including Daphnia magna), positioning it favorably compared to older generation halogenated surfactants phased out due environmental concerns over bioaccumulation risks(NIST comparison data shows logKow value reduction from +7 vs previous analogs' +9 range).

New synthetic pathways being explored involve enzymatic catalysis using lipase variants engineered through directed evolution techniques(Bayer AG patent application filed December 's records describe immobilized Candida antarctica lipase B mutants achieving enantioselectivity >99% ee while operating efficiently at room temperature - drastically reducing energy consumption during large-scale manufacturing processes).

In nanomedicine formulations tested at MD Anderson Cancer Center(January 's preprint data available on bioRxiv), this compound enabled stable co-delivery of photodynamic therapy agents alongside checkpoint inhibitors within single nanocarriers without compromising either component's pharmacological activity – achieving synergistic effects demonstrated through enhanced tumor regression rates (+68%) compared to sequential administration approaches commonly used today.

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