阅读说明：本技术 氘气制备方法及以其作为氘源参与的氘代反应 (Deuterium gas preparation method and deuteration reaction taking deuterium gas as deuterium source ) 是由 郎建平 顾宏伟 朱峰源 于 2021-01-27 设计创作，主要内容包括：本发明涉及一种氘气制备方法及以其作为氘源参与的氘代反应,氘气制备方法包括以下步骤：将铝溶解于液态金属镓中,得到铝-镓合金,然后将氘代水与铝-镓合金反应,反应过程中产出氘气。本发明利用铝与金属镓作用,形成具有活性很高的单原子铝,能够与氘代水持续反应而不会被氧化铝层包裹使反应终止,所产生的氘气可直接作为氘源,与含不饱和碳键的化合物、含硝基的化合物、含氰基的化合物或含卤素的化合物发生氘代反应。(The invention relates to a deuterium gas preparation method and a deuteration reaction taking the deuterium gas as a deuterium source, wherein the deuterium gas preparation method comprises the following steps: dissolving aluminum in liquid metal gallium to obtain aluminum-gallium alloy, and then reacting deuterated water with the aluminum-gallium alloy to produce deuterium gas in the reaction process. The invention utilizes the action of aluminum and metal gallium to form monatomic aluminum with high activity, can continuously react with deuterated water without being wrapped by an alumina layer to terminate the reaction, and the generated deuterium gas can be directly used as a deuterium source to carry out deuteration reaction with a compound containing unsaturated carbon bond, a compound containing nitro group, a compound containing cyano group or a compound containing halogen.)

1. A deuterium gas preparation method is characterized by comprising the following steps:

dissolving aluminum in liquid metal gallium to obtain aluminum-gallium alloy, and then reacting deuterated water with the aluminum-gallium alloy to produce deuterium gas in the reaction process.

2. The method of claim 1, wherein: the mass ratio of the liquid metal gallium to the liquid metal aluminum is 4-6: 1-2.5.

3. The method of claim 1, wherein: the volume of deuterated water reacted per 1-2.5g of aluminum is 1-5 mL.

4. A preparation method of a deuterated organic compound is characterized by comprising the following steps:

(1) dissolving aluminum in liquid metal gallium to obtain aluminum-gallium alloy, and then reacting deuterated water with the aluminum-gallium alloy to produce deuterium gas in the reaction process;

(2) introducing the deuterium gas into a reaction solution containing an organic substrate and a catalyst to react, and obtaining the deuterated organic compound after the reaction is completed; the organic substrate is selected from a compound containing an unsaturated carbon bond, a compound containing a nitro group, a compound containing a cyano group or a compound containing a halogen.

5. The method of claim 4, wherein: in the step (1), the mass ratio of the liquid metal gallium to the liquid metal aluminum is 4-6: 1-2.5.

6. The method of claim 4, wherein: in step (1), the volume of deuterated water reacted per 1-2.5g of aluminum is 1-5 mL.

7. The method of claim 4, wherein: in step (2), the organic substrate is one selected from the group consisting of compounds having the following structural formula:

R-Ar-CH＝CH₂、R-Ar-C≡CH、R-Ar-NO₂、R-Ar-C≡N、R-Ar-X_n；

wherein Ar represents phenyl, X represents halogen, and n-1-6;

r is selected from hydrogen, phenyl, halogen and C₁-C₁₈Alkyl, HO-R¹-or O ═ R²-; wherein R is¹And R²Are each independently selected from C₁-C₁₈An alkyl group.

8. The method of claim 4, wherein: in the step (2), the catalyst is one or more of platinum, palladium, ruthenium, nickel, iridium, silver, iron and copper.

9. The method of claim 4, wherein: in the step (2), the solvent used in the reaction solution is a deuterated reagent.

10. The method of claim 4, wherein: in the step (2), the reaction temperature is 40-60 ℃.

Technical Field

The invention relates to the field of organic synthesis, in particular to a preparation method of deuterium gas and a deuteration reaction taking the deuterium gas as a deuterium source.

Background

Deuterium (D) is an isotope of hydrogen, the nucleus of which is a proton and which contains a proton and a neutron. Thus, deuterium atoms are twice as heavy as hydrogen atoms, and are also referred to as "deuterium". Deuterium is found by american scientist harode cleaton ewing in 1931 when studying the density of water, thus opening the door to deuteration. Deuterium gas (D)₂) Is composed of two deuterium atoms, and is a colorless, tasteless, nontoxic and harmless combustible gas at normal temperature. Deuterium gas has the same chemical property as hydrogen gas, can perform all chemical reactions of common hydrogen, and can generate corresponding compounds. Meanwhile, the deuterium gas has high quality and low zero point characteristics, so that the deuterium gas has different reaction speeds in the same reaction, and the positions of reaction equilibrium points are also obviously different. Initially, deuterium was primarily used in military applications such as the nuclear power industry, laser weapons, controlled nuclear fusion reactions, and the like. Subsequently, the value of deuterium has been explored and has important roles in optical fiber materials, special light sources, agricultural breeding, pharmaceuticals, and the like. In particular, in the fields of chemistry and medicine, the value of artificial deuterated compounds and deuterated techniques is gradually highlighted by people due to the special physicochemical properties of the deuterated compounds.

At present, the main preparation methods of deuterium gas include a liquid hydrogen rectification method, an electrolytic heavy water method, a gas chromatography method, a laser separation method and the like. The equipment required by the methods is expensive and high in energy consumption, and cannot be generally popularized. Such preconditions, which result in expensive deuterium gas, greatly limit the development of deuterated compounds.

There is considerable interest in developing efficient laboratory-scale deuterium gas production processes. In the literature, methods of generating deuterium gas by the reaction of high temperature carbon-free metals with heavy water are reported (see John wRosssini, Journal of Research of the National Bureau of standards, 1937,19, 605-. The high temperature condition of hundreds of degrees centigrade brings about the potential safety hazard for the operation. H₂And D₂Catalytic H/D exchange reactions between O have also been used to obtain deuterium gas. However, this type of reaction cannot produce deuterium gas of high purity except for high pressure, use of a special catalyst and an excess of strong base or acid, so that the resulting deuterated product has low deuteration rate. Furthermore, Sajiki et al propose a strategy for the preparation of deuterium gas by an exchange reaction between hydrogen and excess deuterium water (see Takanori Kurita, Fumiyo Aoki, Takuto Mizumoto, ToshihideMaejima, Hiroyoshi Esaki, Tomohiro Maegawa, Yasunari Monguchi, Hironao Sajiki, chem.Lett.chem.Eur.J.2008,14, 3371-3379). The excess of heavy water makes the reaction cost prohibitive. Likewise, the method of Himeda et al using high cost deuterated formic acid also reduces the practical value of the reaction (see Wan-Hui Wang, Jonathan F. Hull, James T. Mukerman, Etsuko Fujita, Takuji Hirose, YuichiroHimeda, chem. Eur. J.2012,18, 9397-. Studies have not been made on how to prepare deuterium gas, which has recently been obtained by Fujita et al by reacting deuterated methanol with deuterium oxide at reflux for 48 hours (see AkaneEnomoto, ShunpeiKajita, Ken-ichi Fujita, chem. Lett.2019,48, 106-. However, this reaction requires a specific catalyst, a long reaction time, and the purity of deuterium gas is only 63%. In the traditional industry, aluminum reacts with water to produce hydrogen. However, the reaction of the two substances can generate a compact alumina layer to wrap aluminum, so that the aluminum and water are prevented from continuously reacting, and how to solve the problem becomes a difficult point.

In conclusion, the industrial preparation method of deuterium gas has the defects of expensive equipment and high energy consumption. The laboratory-scale deuterium gas preparation method has the defects of low yield, need of a specific catalyst, overhigh operation cost and the like.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a method for preparing deuterium gas and a deutero-reaction using the same as a deuterium source, wherein the method utilizes the action of aluminum and metal gallium to form monatomic aluminum with high activity, and the monatomic aluminum can continuously react with deutero-water without being wrapped by an alumina layer to terminate the reaction, and the generated deuterium gas can be directly used as a deuterium source and participate in the deutero-reaction.

One of the purposes of the invention is to disclose a deuterium gas preparation method, which comprises the following steps:

dissolving aluminum in liquid metal gallium to obtain aluminum-gallium alloy, and then substituting deuterium into water (D)₂O) reacts with the Al-Ga alloy to produce deuterium (D)₂)。

Further, the mass ratio of the liquid metal gallium to the aluminum is 4-6: 1-2.5.

Further, the volume of deuterated water reacted per 1-2.5g of aluminum is 1-5 mL.

Further, the above reaction is carried out at 20 to 70 ℃ for 4 hours or less.

Aluminum is dissolved in liquid metal gallium, gallium is infiltrated into the crystal boundary of the aluminum, the crystal lattice of the aluminum is expanded, so that the electrode potential of the aluminum-gallium alloy is lower than the decomposition potential of deuterated water, the generated high-activity monatomic aluminum reacts with the deuterated water, and deuterium gas preparation is realized.

The second purpose of the invention is to disclose a preparation method of a deuterated organic compound, which is a deuterated reaction taking deuterium as a deuterium source to participate, and comprises the following steps:

(1) dissolving aluminum in liquid metal gallium to obtain aluminum-gallium alloy, and then reacting deuterated water with the aluminum-gallium alloy to produce deuterium gas in the reaction process;

(2) introducing deuterium gas into a reaction solution containing an organic substrate and a catalyst to react, and obtaining a deuterated organic compound after the reaction is completed; the organic substrate is selected from a compound containing an unsaturated carbon bond, a compound containing a nitro group, a compound containing a cyano group or a compound containing a halogen.

Further, in the step (1), the mass ratio of the liquid metal gallium to the liquid metal aluminum is 4-6: 1-2.5.

Further, in the step (1), the volume of deuterated water reacted per 1-2.5g of aluminum is 1-5 mL.

Further, in the step (2), the organic substrate is selected from one of compounds having the following structural formula:

R-Ar-CH＝CH₂、R-Ar-C≡CH、R-Ar-NO₂、R-Ar-C≡N、R-Ar-X_n；

wherein Ar represents phenyl, X represents halogen, and n-1-6;

r is selected from hydrogen, phenyl, halogen and C₁-C₁₈Alkyl, HO-R¹-or O ═ R²-; wherein R is¹And R²Are each independently selected from C₁-C₁₈An alkyl group.

In step (1), the reaction routes are respectively as follows:

further, in the step (2), the catalyst is one or more of platinum, palladium, ruthenium, nickel, iridium, silver, iron and copper. Platinum nanowires and nickel are preferred.

Further, in the step (2), the solvent used in the reaction solution is a deuterated reagent. Preferred are deuterated acetonitrile and deuterated methanol.

Further, in the step (2), the reaction temperature is 40 to 60 ℃.

Further, in the step (2), the reaction time is 1 to 3 hours.

By the scheme, the invention at least has the following advantages:

1. the invention provides a simple deuterium gas preparation method, which can be widely popularized, has high reaction yield, does not need a specific catalyst and has low operation cost; the prepared deuterium gas can be directly used as a deuterium source and participates in a deuteration reaction.

2. The invention provides a preparation method of a deuterated organic compound, which comprises the reaction of an unsaturated carbon bond compound, a nitro-containing compound, a cyano-containing compound or a halogen-containing compound, and is a deuteration reaction taking deuterium as a deuterium source.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following description is made with reference to the preferred embodiments of the present invention and the accompanying detailed drawings.

Drawings

Fig. 1 is a schematic diagram of a process for producing deuterium gas.

Detailed Description

As shown in fig. 1, the deuterium gas preparation method comprises the following steps:

40-60g of liquid metal gallium is added into an erlenmeyer flask, 10-25g of simple substance aluminum is dissolved into the gallium, then 1-10mL of deuterated water is added into the aluminum gallium metal, and the deuterated water and the aluminum react rapidly to generate 0.1-10 liters of deuterium gas.

The preparation method of the deuterated organic compound comprises the following steps:

mixing an organic substrate and a catalyst in a deuterated solvent, and introducing deuterium gas to perform a deuterated reaction to obtain a deuterated organic compound.

The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example 1

(1) 40g of liquid metal gallium was added to the flask, 10g of elemental aluminum was dissolved in the gallium, and then 6ml of deuterated water was added to the aluminum gallium metal, which reacted rapidly with aluminum to produce 7 liters of deuterium gas. The deuterium yield was 94%.

(2) Mixing styrene (10-100 μ l) and platinum nanowire (2-5mg) in deuterated acetonitrile, introducing deuterium gas, reacting at 40-60 deg.C under stirring for 1-3 hr, and determining by nuclear magnetism and mass spectrometry to obtain ethylbenzene-d₂The yield is 90-99%, and the deuteration rate is>99 percent. Ethylbenzene-d₂The characterization results are as follows:

¹H NMR(400MHz,CD₃CN)δ[ppm]7.30–7.12(m,5H),2.62–2.58(m,1H),1.21–1.13(m,2H)；GC-MS(CI):108.12。

example 2

(1) 40g of liquid gallium metal was added to the flask, 10g of elemental aluminum was dissolved in the gallium, and then 6ml of deuterated water was added to the aluminum gallium metal, which reacted rapidly with aluminum to produce 7 liters of deuterium gas. The deuterium yield was 94%.

(2) Mixing phenylacetylene (10-100 μ l) and platinum nanowire (2-5mg) in deuterated acetonitrile, introducing deuterium gas, reacting at 40-60 deg.C under stirring for 1-3 hr, and determining by nuclear magnetism and mass spectrometry to obtain ethylbenzene-d₄The yield is 90-99%, and the deuteration rate is>99 percent. Ethylbenzene-d₄The characterization results are as follows:

¹H NMR(400MHz,CD₃CN)δ[ppm]7.28–7.10(m,5H),1.18–1.11(m,1H)；GC-MS(CI):110.13.

example 3

(1) 40g of liquid metal gallium was added to the flask, 10g of elemental aluminum was dissolved in the gallium, and then 6ml of deuterated water was added to the aluminum gallium metal, which reacted rapidly with aluminum to produce 7 liters of deuterium gas. The deuterium yield was 94%.

(2) Mixing nitrobenzene (10-100 mu l) and platinum nanowire (2-5mg) in deuterated acetonitrile, introducing deuterium gas, stirring at 40-60 ℃ for reaction for 1-3 hours, and confirming through nuclear magnetism and mass spectrometry after the reaction is finished to obtain aniline-d₂The yield is 90-99%, and the deuteration rate is>99 percent. Aniline-d₂The characterization results are as follows:

¹H NMR(400MHz,CD₃CN)δ[ppm]7.10–6.99(m,2H),6.66–6.53(m,3H)；GC-MS(CI):95.12.

example 4

(1) 40g of liquid gallium metal was added to the flask, 10g of elemental aluminum was dissolved in the gallium, and then 6ml of deuterated water was added to the aluminum gallium metal, which reacted rapidly with aluminum to produce 7 liters of deuterium gas. The deuterium yield was 94%.

(2) Mixing benzonitrile (10-100 mu l) and platinum nanowire (2-5mg) in deuterated methanol, introducing deuterium gas, stirring at 40-50 ℃ for reaction for 2-10 hours, and confirming to obtain dibenzylamine-d by nuclear magnetism and mass spectrometry after the reaction is finished₅The yield is 80-95%, and the deuteration rate is>99 percent. Dibenzylamine-d₅The characterization results are as follows:

¹H NMR(400MHz,CD₃CN)δ[ppm]7.33–7.04(m,10H),3.66(s,0H)；GC-MS(CI):203.25.

example 5

(1) 40g of liquid gallium metal was added to the flask, 10g of elemental aluminum was dissolved in the gallium, and then 6ml of deuterated water was added to the aluminum gallium metal, which reacted rapidly with aluminum to produce 7 liters of deuterium gas. The deuterium yield was 94%.

(2) Mixing iodobenzene (10-100 μ l) and nickel (2-6mg) in deuterated methanol, introducing deuterium gas, reacting at 40-60 deg.C for 1-6 hr under stirring, and determining by nuclear magnetic resonance and mass spectrometry to obtain benzene-d₁The yield is 90-99%, and the deuteration rate is>99 percent. Benzene-d₁The characterization results are as follows:

¹H NMR(400MHz,CD₃CN)δ[ppm]7.10–6.99(m,2H),6.66–6.53(m,3H)；GC-MS(CI):79.11.

the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.