• 1. Evolution of calcium phosphate precipitation in hanging drop vapor diffusion by in situRaman microspectroscopy
  Gloria Belén Ramírez-Rodríguez,José Manuel Delgado-López,Jaime Gómez-Morales CrystEngComm, 2013,15, 2206-2212
• 2. Fate of single walled carbon nanotubes in wetland ecosystems?
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• 4. Emerging investigator series: heterogeneous reactions of sulfur dioxide on mineral dust nanoparticles: from single component to mixed components?
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Professional Introduction to 2,2,6,6-tetramethylmorpholine hydrochloride (CAS No. 167947-93-5)

2,2,6,6-tetramethylmorpholine hydrochloride, with the chemical formula C₉H₁₉NCl, is a derivative of morpholine that has garnered significant attention in the field of pharmaceutical and chemical research due to its unique structural and functional properties. This compound, identified by the CAS number 167947-93-5, is primarily utilized as a chiral auxiliary and ligand in asymmetric synthesis, as well as a potential intermediate in the development of novel therapeutic agents. Its molecular structure, characterized by a highly substituted morpholine ring, imparts exceptional stability and reactivity, making it a valuable tool in synthetic chemistry.

The 2,2,6,6-tetramethylmorpholine hydrochloride salt form enhances its solubility in aqueous systems, facilitating its application in various biochemical assays and drug formulation processes. Recent advancements in medicinal chemistry have highlighted its role in the development of enantioselective catalysts, which are crucial for producing single-enantiomer drugs with improved pharmacological profiles. The compound's ability to stabilize transition metal complexes has opened new avenues in catalytic organic transformations, particularly in cross-coupling reactions that are pivotal for constructing complex molecular architectures.

In the realm of drug discovery, CAS No. 167947-93-5 has been explored as a component in the synthesis of novel morpholine-based scaffolds. These scaffolds exhibit promising biological activities across multiple therapeutic domains, including central nervous system (CNS) disorders and anti-inflammatory applications. Studies have demonstrated that derivatives of this compound can modulate neurotransmitter pathways by acting as selective ligands for certain receptors. The chiral center in the 2,2,6,6-tetramethylmorpholine hydrochloride framework allows for the creation of enantiomerically pure compounds, which is essential for achieving optimal pharmacodynamic and pharmacokinetic properties.

Recent research has also delved into the use of 2,2,6,6-tetramethylmorpholine hydrochloride as a protecting group in peptide synthesis. Its stability under various reaction conditions makes it an ideal candidate for safeguarding sensitive functional groups during multi-step syntheses. Additionally, its ability to form stable complexes with metal ions has been leveraged in the development of novel catalysts for polymerization reactions. These catalysts exhibit high efficiency and selectivity, contributing to the sustainable production of high-value polymers.

The compound's versatility extends to its application in biochemical research. It has been employed as a cofactor mimic in enzymatic assays, where it mimics natural substrates or coenzymes to study enzyme mechanisms. Furthermore, its chiral nature makes it useful in studying stereoselective processes in biological systems. Researchers have utilized derivatives of CAS No. 167947-93-5 to investigate how chirality influences metabolic pathways and drug metabolism.

In industrial applications, 2,2,6,6-tetramethylmorpholine hydrochloride is valued for its role as a corrosion inhibitor and stabilizer in various chemical processes. Its ability to form protective layers on metal surfaces prevents degradation under harsh conditions. This property is particularly relevant in petrochemical refining and metal processing industries where maintaining equipment integrity is critical.

The synthesis of 2,2,6,6-tetramethylmorpholine hydrochloride involves multi-step organic transformations that highlight its synthetic utility. The process typically begins with the alkylation of morpholine followed by ring substitution reactions to introduce the tetramethyl group. The final step involves salt formation with hydrochloric acid to enhance solubility and stability. Advances in synthetic methodologies have improved the yield and purity of this compound through optimized reaction conditions and purification techniques.

The safety profile of CAS No. 167947-93-5 has been thoroughly evaluated through preclinical studies conducted across various research institutions. These studies have demonstrated its low toxicity profile when used under controlled laboratory conditions. However, standard safety protocols should be followed during handling to minimize exposure risks. Proper ventilation and personal protective equipment (PPE) are recommended when working with this compound to ensure safe laboratory practices.

The future prospects for 2,2,6,6-tetramethylmorpholine hydrochloride are promising as ongoing research continues to uncover new applications and refine existing ones. Its role in asymmetric synthesis is expected to expand with the development of more sophisticated catalytic systems. Additionally， collaborations between academia and industry are likely to drive innovation in drug discovery programs leveraging this versatile compound.

In conclusion,CAS No 167947-93-5 represents a cornerstone molecule in modern chemical research with far-reaching implications across pharmaceuticals，materials science，and industrial chemistry。 Its unique structural features make it an indispensable tool for chemists，biologists，and engineers alike。 As scientific understanding evolves，the potential applications for this compound will undoubtedly continue to grow，solidifying its importance as a key player in advanced chemical solutions.

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