Morpholine
What Is Morpholine
Morpholine is an organic chemical compound having the chemical formula O(CH2CH2)2NH. This heterocycle features both amine and ether functional groups. Because of the amine, morpholine is a base; its conjugate acid is called morpholinium. For example, treating morpholine with hydrochloric acid generates the salt morpholinium chloride. It is a colorless liquid with a weak, ammonia- or fish-like odor. The naming of morpholine is attributed to Ludwig Knorr, who incorrectly believed it to be part of the structure of morphine.
Advantages of Morpholine
Control corrosion in steam condensate systems
Morpholine is used to control corrosion in steam condensate systems. It neutralizes carbon dioxide and other corrosive acid components in steam and condensate, aids in maintaining the proper ph throughout the system, has a suitable vapour pressure and aqueous solubility, and is stable at temperatures up to 288°c.
Widely used as analgesics
Morpholine derivatives are widely used as analgesics, anti-inflammatory, anticancer, antidepressant, hiv-protease inhibitors, antimicrobial, anti-viral agents etc.
Used as a boiler water treatment additive in steam systems
Morpholine is used as a boiler water treatment additive in steam systems of power plants and refineries. It forms an even wax like coating as morpholine oleate. It prevents decomposition of a chlorinated hydrocarbon in a composition containing the chlorinated hydrocarbon and a large amount of water.
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Morpholine is an organic chemical compound. This heterocycle features both amines as well as ether functional groups. It is a base because of the amine. Its conjugate acid is called morpholinium.
The morpholine chemical is a colorless hygroscopic liquid with a particular smell (smells like ammonia or fishy smell). It is entirely miscible with water, as well as with lots of organic solvents. But the morpholine solubility is restricted in an alkaline aqueous liquid.
The vapor stress of the aqueous liquid of morpholine is extremely close to that of water alone. And also, this feature is good for solutions of consistent alkalinity.
Uses of Morpholine
Morpholine is a common additive, in parts per million concentrations, for pH adjustment in both fossil fuel and nuclear power plant steam systems. Morpholine is used because its volatility is about the same as water, so once it is added to the water, its concentration becomes distributed rather evenly in both the water and steam phases. Its pH-adjusting qualities then become distributed throughout the steam plant to provide corrosion protection. Morpholine is often used in conjunction with low concentrations of hydrazine or ammonia to provide a comprehensive all-volatile treatment chemistry for corrosion protection for the steam systems of such plants. Morpholine decomposes reasonably slowly in the absence of oxygen at the high temperatures and pressures in these steam systems.
Morpholine undergoes most chemical reactions typical for other secondary amines, though the presence of the ether oxygen withdraws electron density from the nitrogen, rendering it less nucleophilic (and less basic) than structurally similar secondary amines such as piperidine. For this reason, it forms a stable chloramine. It is commonly used to generate enamines. Morpholine is widely used in organic synthesis. For example, it is a building block in the preparation of the antibiotic linezolid, the anticancer agent gefitinib (brand name Iressa) and the analgesic dextromoramide. In research and in industry, the low cost and polarity of morpholine lead to its common use as a solvent for chemical reactions.
In nature, fruits make waxes to protect against insects and fungal contamination, but this can be lost as the fruit is cleaned. Hence a small amount of new wax, made from shellac, is applied to replace it. Morpholine is sometimes used as an emulsifier and solubility aid for this new coating.
Morpholine derivatives used as agricultural fungicides in cereals are known as ergosterol biosynthesis inhibitors.
Morpholine is an organic amine used as boiler corrosion inhibitor. It finds a variety of uses such as manufacturing of rubber accelerators, curing agents, cleaning agents, anti-rust agents, and surface-active agents. It contains both amine and ether groups, used in a wide range of applications. The amine group makes its base, its conjugate acid is called morpholinium, which appears as a colourless liquid with a fishlike smell.
In boiler water treatment, morpholine helps increase the pH of boiler feed water to protect the boiler against corrosion. It is used as boiler inhibitor intermediate available in the form of a colourless liquid.
Boilers are usually used in various industrial companies for their steam production capability. Ensure that such boiler systems are correctly going on and they work at optimum efficiency. To ensure an efficient process and quality steam creation capacity of the boiler system, the correct water condition must be maintained at all times. Heat exchange, steam protection, and corrosion protection are all necessary for boiler water treatment.
The efficiency of any boiler depends upon its capability of heat transfer. In a boiler system, all the contact surfaces between the fireside and steam side are made up of metals or metal combinators as metals are good conductors of heat. A large number of components can be dissolved in water as water is known as a universal solvent. Now the water used here is mostly untreated such as river water, tap water, municipal bores, etc. which has dissolved oxygen. It reacts with metal and forms metal oxide. These oxides can occur in corrosive reactions and can degrade the metallic property of the boiler system.
It can be accomplished by dosing selected chemicals for boiler water treatment into the feed water. The appropriate Boiler system will assist with keeping away from higher repair costs, poor quality of steam, and expensive maintenance fees because of scaling, consumption, and fouling of the heater and downstream apparatus. Continuous accumulation of salts and when it exceeds the solvency results in the formation of scales.
How Is Morpholine Made?
Dehydration of diethanolamine with acid
In this process, morpholine is derived from diethanolamine, an organic compound created by mixing ethylene oxide and ammonia. A strong acid is heated to at least 150 celsius and added to the diethanolamine. This reaction is then neutralized with an alkali or other base. The resulting liquid contains morpholine, which is distilled through the use of a solvent. This is ultimately a “dehydration” process in chemical terms, because the hydrogen and oxygen atoms that make water are removed from diethanolamine’s structure, leaving behind morpholine molecules.
Hydrogenating and vaporizing diethylene glycol and ammonia
This method, developed in the 1980s, has become the most common way to make morpholine, due to its speed and efficiency. Diethylene glycol and ammonia are combined with hydrogen. A catalyst substance (typically a metal such as copper, nickel or cobalt) is also in the mix to trigger the hydrogenation– the molecular infusion of hydrogen– of the diethylene glycol and ammonia. The whole mixture is then heated to between 150 and 400 celsius and pressurized. The resulting chemical reaction creates a solution that contains morpholine molecules. The morpholine is then extracted from the mixture by vaporization. The morpholine escapes in the vapor and is collected. (in chemistry, this kind of vaporization extraction method is also known as a stripping operation.)
Combining ether and dry ammonia
Here, ether, specifically a bis (2-chloroethy1) ether compound is mixed with dry, water-free ammonia and a chemically compatible solvent. These chemicals are stored together in warm but not boiling temperatures of 50 celsius for 24 hours. The mix is stored in a completely sealed, sturdily rigid container– a closed vessel in chemistry terms– so that the mixture doesn’t increase in volume while the chemical and heat reactions happen. Once the vessel is unsealed, excess ammonia is vented, and the reaction leaves behind ammonium chloride and morpholine. The morpholine is then distilled from the solution.
Medicinal Chemistry: Deep Insight into the Structure-Activity Relationship (Sar)
Various researchers are considerably focusing the heterocyclic compounds because of their versatile nature. Both natural and synthetic compounds have prominent pharmacological properties. However, people's attentions have diverted toward synthetic drugs obtained by making various structural modifications in natural compounds having similar or superior activity.
Morpholine is an organic chemical compound having a six-membered ring containing two heteroatoms nitrogen and oxygen, considered as the important nucleus in medicinal chemistry.
Morpholine derivatives are widely used as analgesics, anti-inflammatory, anticancer, antidepressant, HIV-protease inhibitors, antimicrobial, Anti-viral agents etc. In the industrial applications, it acts as a catalyst, corrosion inhibitor, separating agent, optical brighteners, rubber chemical, wax emulsifier and surface-active agents. Morpholine is also used as chiral organocatalysts, chiral auxiliaries, chiral templates in the synthesis of α-hydroxy acids and oxacycles in the laboratory. Apart from this, it has wide agricultural applications i.e. fenpropimorphan which is widely used as a fungicide in cereals. The large pool of enzyme and hormonal inhibitors are reported to have morpholine ring. i.e. selective norepinephrine inhibitor, HER (human epidermal growth factor receptor) kinase inhibitor, glucosidase inhibitor, P38 MAP kinase inhibitor, phosphoinositidine-3-kinase inhibitor, FLT3 kinase inhibitor, urease inhibitor, cysteine protease inhibitor, selective SV2 receptor inhibitor, dopamine receptor inhibitor, 5-lipooxygenase inhibitor, vasopressin receptor antagonists, acetylcholine receptor antagonist, A431, HS27, HT29, KV, K562 human cancer cell growth inhibitor, NPY-Y5 receptor antagonists etc.
This catalytic method is suitable in drug discovery for the synthesis of N-heterocyclic compounds. Synthesis of substituted morpholine from aminoalkynes through the mechanism of hydroamination and hydrogenation was reported by Lau et al, In the first step, cylic imine was produced with the use of bis(amidate) bis (amido) Ti catalyst from aminoalkyl substrate. The second step involved the reduction in the presence of RuCl[(S,S)-Ts-DPEN] (η6-p-cymene). Short method for the morpholine synthesis using aminoalcohol or diamines with α-phenylvinylsulphonium salts was also reported. High yield and good quality is obtained with the use of base and DMC solvent without the use of any controlled temperature and pressure conditions. The same methodology can also be applied for the synthesis of piperazine, azepines, oxazepines with high yield. Sun and coworkers investigated aziridines for the strategic synthesis of 2, 3-disubstituted morpholine. Previously, synthesis was conducted in the presence of sodium persulphate which gave about 90% yield. Subsequently, one-pot metal-free synthesis technique was devised with the addition of the ammonium persulfate salt as an oxidant for the ring-opening of aziridine and allowed to react with haloalcohols producing about 93% yield. Further, chiral aziridines were used for the synthesis of pure morpholines with this technique. The mechanism involved the intramolecular cyclisation of alkenols/thioalkenols. The main advantages of this method were high yield and diastereoselectivity. This method of synthesis was highly compatible with a wide range of functional groups such as ester, hydroxyl, and bromoalkynes.