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Helional(2-Methyl-3-(3,4-methylenedioxyphenyl)propanal) is an aromatic organic compound, which can be regarded as a homologue of piperonal and has the structure of phenylpropanoid. Molecular formula C11H12O3, CAS 1205-17-0, insoluble in water, soluble in alcohol. It is a synthetic spice with floral, green, aldehyde, and ozone like aromas, as well as a fresh watermelon aroma and a light lily of the valley and jasmine like fennel aroma. It is widely used to prepare a variety of floral, forest and sea breeze essence, such as jasmine and rabbit ear flowers, with lasting fragrance. It can also be used for the blending of almost all flower fragrance, such as cyclamen, jasmine, lily of the valley, lilac, rose, and various international famous brand perfume. It is an indispensable precious spice. It does not exist in nature and can currently only be prepared through synthesis.
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| Chemical Formula | C11H12O3 |
| Exact Mass | 192 |
| Molecular Weight | 192 |
| m/z | 192 (100.0%), 193 (11.9%) |
| Elemental Analysis | C, 68.74; H, 6.29; O, 24.97 |
New jasmine aldehyde, English name Helional, chemical name 2-methyl-3- (3,4-methylenedioxyphenyl) propanal, CAS number 1205-17-0, molecular formula C ₁₁ H ₁₂ O3, molecular weight 192.21. It is a homologue of piperonal, which can be regarded as a deeply processed product of piperonal with a methyl and an ethyl chain segment introduced into its molecular skeleton. It belongs to the aromatic compounds of phenylpropanoid class. This physical and chemical property determines its unique advantage in food essence formulation - it can be fully dissolved in oil phase system, and can be evenly dispersed in water-based food system through alcohol medium, with strong adaptability.
The underlying logic from molecular skeleton to food aroma
And aroma is the true soul of Xinyang Jasmine Aldehyde. It has a quadruple blend of floral, green, aldehyde, and ozone like aromas, with gentle scents of fresh flowers and plants such as rabbit ear grass aldehyde, lilac, freshly cut grass, and cyclamen, as well as fresh melon and watermelon like fruit green aromas. This complex aroma structure gives it a high degree of adaptability in food fragrance - it can not only give the food a fresh aroma, but also run through the overall fragrance, playing a coordinating role in connecting the past and the future. More importantly, Xinyang jasmonaldehyde is one of the rare varieties of synthetic spices that can retain fragrance for a long time.
Four "passes" to enter the food industry
Any spice used in food must first pass regulatory requirements. It has been officially approved in the major global food safety regulatory systems, which is the fundamental prerequisite for its legal entry into the food industry and the confidence that food companies dare to use it. The first approval comes from the United States. FEMA (Flavor and Extract Manufacturers Association of America) listed it in GRAS (generally considered safe) substances list, number 2341, which means that it can be safely used for food essence preparation in the American market.
The second approval comes from Europe. The Council of Europe has designated it as COE 111 and included it in the European Food Flavors Catalogue, allowing its use in food products of EU member states.
The third round of approval comes from China. GB 2760-2014 "National Food Safety Standard - Standard for the Use of Food Additives" also approves Xinyangjasmonal as a permitted food flavoring.
The simultaneous approval of the four major regulatory systems fully demonstrates that safety has been recognized by major global food safety regulatory agencies. This is not a self declaration of a certain company, but an official endorsement after rigorous toxicological evaluation.
As a head fragrance
According to the clear record in the professional textbook of Synthetic Flavor Technology, the primary role in food essence is head fragrance. The so-called "head fragrance" refers to the aroma that consumers first perceive when they open the packaging and enter the mouth. It determines the first impression that food gives people and is the key to "getting ahead of others".
It is used in extremely small amounts in the following flavor types of food essence:
Spicy food essence: it provides a fresh opening for spicy flavor food such as curry, pepper, turmeric, etc., to avoid the abrupt spicy feeling, making the spicy "acceptable".
Dill type food essence: dill itself has a quiet fragrance, and the green flavor can enhance its freshness, making the overall fragrance more transparent and not stuffy.
Herb based food essence: in herbal flavor foods such as mint, basil, rosemary, etc., its ozone like head fragrance can give the product a fresh sense of "just picked", as if the herb still has dew.
Essence of gooseberry type food: The aroma of black and red gooseberry itself has a sharp acidity, and the flower green fragrance can soften this sharp, making the fruit more mellow and plump.
Vegetable food essence: in vegetable flavor foods such as tomatoes, cucumbers, celery, etc., the smell of cucumbers naturally matches the freshness of vegetables, which can significantly enhance the sense of reality and make vegetable flavor foods no longer "fake".
Essence of condiment type food: in the compound condiment essence, as the first flavoring agent, it can open the aroma level at the moment of entrance to avoid the dull and monotonous flavor of condiment.
Berry food essence: among berry essence such as strawberry, blueberry and raspberry, flower green flavor can add "flower like sweetness" to the fruit flavor, making the berry flavor more three-dimensional and hierarchical.
The three words' extremely trace 'are crucial. The aroma intensity of Xinyang jasmonaldehyde is extremely high, and the use level is usually ppm (one millionth). A slight excess will lead to the imbalance of aroma, resulting in the so-called "essence flavor". That's also why it is positioned as a head fragrance rather than the main spice - a small amount can be effective with just a few ounces of a thousand pounds. Its dosage can reach 10% in daily chemical essence, but it must be strictly controlled at single digit ppm in food essence, which is a dual requirement of food safety and sensory quality.
Oral care food
This is an easily overlooked but highly valuable use of Xinyang jasmonal in the food industry. According to industry data, it has no effect on the intestines, which makes it not only suitable for traditional food essence, but also safe for oral care products and food.
Specifically, it can be used for the following oral care foods: mouthwash, oral spray, chewing oral freshener, etc. Its green fragrance aldehyde fragrance can quickly release a refreshing sensation in the mouth, and because it has no impact on the intestines, even partial swallowing will not cause safety issues.
Functional food essence
This is the most forward-looking application in the food industry. According to professional data, Xinyang Jasmonaldehyde can be used to prepare essence with the function of relieving stress or memory loss caused by insufficient sleep.
This use elevates spices from simply "enhancing fragrance" to a "functional" level. In recent years, the functional food market has flourished, and regulating emotions and cognitive states through aroma has become an emerging direction. Its fresh fragrance is considered to help relieve mental stress and improve attention, so it is included in the formula system of functional food essence.
Although this field is still in the exploratory stage, the direction is clear: aroma is not just "delicious", but can also be "useful".
Synergistic enhancement with methyl dihydrojasmonate
In the preparation of food essence, it is better to use it together with methyl dihydrojasmonate, and this synergy is particularly prominent in the flower flavor food essence.
Methyl dihydrojasmonate provides mellow jasmine base fragrance and fresh green fragrance. The combination of the two can create a complete aroma structure of "top note note fresh, middle note note floral fragrance, and end note lasting" in food essence.
Especially in jasmine type, rabbit ear flower type, lilac type and other flower flavor food essence, this combination effect is the most significant. For example, in products such as jasmine tea flavored drinks, jasmine scented pastries, and lilac flavored candies, the combination of Xinyang jasmonal and dihydrojasmonate methyl ester is almost standard. It can also be used to blend almost all flower fragrance, such as cyclamen, jasmine, rose, etc., including all kinds of international famous brand perfume, which have more or less the smell of new foreign jasmonate, and this "high sense of calm" is infiltrating into the food field.
In the field of food, the use of "extremely trace" may seem to be summarized in just three words, but in reality, it contains a profound question of fine fragrance. From perfumery to oral care food, from vegetable flavoring to functional essence, from flower fragrance blending to golden coordination with methyl dihydrojasmonate, it is creating a unique track in the food essence industry, based on the approval of four laws and regulations, taking ppm level precise dosage as the means, and taking "extra long" fragrance retention as the sharp edge.
As an important perfume and fine chemical, Helional is widely used in perfume, cosmetics, food flavoring and other fields. The traditional synthesis method usually involves multiple reactions, including the initial conversion of piperonal and subsequent hydrogenation reduction steps. Next, we will elaborate on the two synthesis methods of Xinyang Jasmine Aldehyde: stepwise method and one pot method, and explore the chemical principles, reaction condition optimization, and product characterization in each step.
Synthesis of New Jasmonal by Stepwise Method
Step 1: Condensation reaction between piperonal and acetaldehyde
Jasmine aldehyde (3-methyl-2-butenal) undergoes a condensation reaction with acetaldehyde under alkaline conditions to produce piperonyl propanal. This reaction is a typical aldol condensation process, in which a base (such as potassium hydroxide) catalyzes the addition elimination reaction between aldehyde groups, forming new carbon carbon bonds.
Chemical equation:
Jasmine aldehyde+acetaldehyde+KOH → piperonyl acetaldehyde+water
2. Experimental steps
-Preparation stage:
Accurately weigh 100g of jasmonal, 40g of acetaldehyde, 3g of potassium hydroxide, and an appropriate amount of 100g of methanol (as a solvent, also involved in the reaction, but not explicitly stated in this equation), and place them in a dry three necked flask.
-Reaction process:
Start stirring to fully mix the reactants and react for 1.5 hours at the specified temperature. During this period, pay attention to observing temperature changes and changes in the color and state of the reaction solution.
-Reaction conditions:
Install the mixer, thermometer, and condenser tube, heat to the reaction temperature of 40 ℃, and maintain a constant temperature.
-Post processing:
After the reaction is complete, cool to room temperature and purify the product by vacuum distillation or extraction to obtain piperonyl aldehyde.
3. The product was characterized by infrared spectroscopy (IR), nuclear magnetic resonance (NMR) and other methods to confirm its structure as piperonyl aldehyde.
Step 2: Hydroreduction reaction of piperonyl propanal
Piperonyl aldehyde undergoes a hydrogenation reduction reaction in the presence of palladium carbon catalyst in a hydrogen atmosphere, where the double bond is reduced to a single bond, resulting in the formation of new jasmonal. This is a typical catalytic hydrogenation reaction, in which palladium carbon serves as the active center, promoting the adsorption, dissociation, and hydrogenation process of hydrogen molecules on the catalyst surface.
Chemical equation: Piperonyl aldehyde+H2 → New jasmonal
2. Experimental steps
-Preparation stage:
Mix 100g of piperonyl aldehyde obtained in the first step (the actual amount needs to be adjusted according to the yield of the first step) with 100g of methanol (as a solvent), add 5g of 5% palladium carbon catalyst, and place it in a hydrogenation kettle.
-Reaction process:
Start stirring to allow the reactants to fully contact the catalyst, and react for 3 hours under specified conditions. Regularly check the hydrogen pressure during this period and replenish hydrogen if necessary.
-Reaction conditions:
Seal the hydrogenation kettle, fill it with hydrogen gas to an absolute pressure of 300KPa, heat it to a reaction temperature of 40 ℃, and maintain a constant temperature.
-Post treatment:
After the reaction is complete, cool to room temperature, filter to remove the catalyst, and separate and purify the product through distillation or extraction methods to obtain new jasmonal.
Similarly, infrared spectroscopy, nuclear magnetic resonance and other methods were used to characterize the structure of the product, confirming that it is neojasmonal.
One pot synthesis of new jasmonal
1. Reaction principle and steps
The one pot method aims to combine the above two reactions into a continuous process, completing the conversion from piperonal to neopiperonal in the same reaction vessel. This method simplifies the operation process and reduces the separation and purification steps of intermediate products, but it may also face challenges such as optimizing reaction conditions and generating by-products.
Chemical equation (two-step synthesis): piperonal+acetaldehyde+H2+KOH → neopiperonal+water
Experimental steps:
-Preparation stage: Add 100g of jasmonal, 40g of acetaldehyde, 100g of methanol, 3g of potassium hydroxide, and 5g of 5% palladium carbon catalyst into the hydrogenation kettle at once.
-Reaction conditions: Seal the hydrogenation kettle, fill it with hydrogen gas to an absolute pressure of 300KPa, heat it to a reaction temperature of 40 ℃, and maintain a constant temperature.
-Reaction process: Start stirring to thoroughly mix all reactants and catalysts, and react for 3 hours under specified conditions. During this period, it is necessary to closely monitor the reaction process and adjust the reaction conditions if necessary.
-Post processing: After the reaction is complete, the reaction mixture is processed according to conventional methods to separate and purify the new jasmine aldehyde.
2. Orthogonal method for optimizing reaction conditions
Due to the involvement of multiple reaction variables (such as temperature, pressure, time, catalyst dosage, etc.) in the one pot method, the orthogonal method can be used to systematically explore the effects of each factor on the reaction yield, thereby determining the optimal reaction conditions.
-Design orthogonal table: Based on the experimental purpose and the number of variables, design an appropriate orthogonal table and arrange experimental combinations at different levels.
-Implementation experiment: Conduct experimental operations according to the experimental conditions arranged in the orthogonal table, and record the reaction yields under each combination.
-Data analysis: Use methods such as range analysis and variance analysis to evaluate the impact of various factors on yield and determine the optimal combination of reaction conditions.
In this case, the optimal reaction conditions obtained through orthogonal method exploration are: 100g of jasmonal, 100g of methanol, 40g of acetaldehyde, 5g of 5% palladium carbon catalyst, 3g of potassium hydroxide, 300KPa absolute pressure in the hydrogenation kettle, 40 ℃ reaction temperature, and 3h reaction time, with a yield of 64.8%.
The above provides a detailed explanation of the stepwise and one pot synthesis methods of Helional, including reaction principles, experimental steps, condition optimization, and product characterization. Although the step-by-step method is cumbersome, the reaction conditions for each step are relatively independent and easy to control; The one pot rule simplifies the operation process and improves synthesis efficiency, but optimizing reaction conditions is more complex. Both methods have their own advantages and disadvantages, and the appropriate synthesis route can be selected according to actual needs. Future research can further explore new catalysts, optimize reaction conditions, improve yields, and reduce the generation of by-products. Meanwhile, with the deepening development of green chemistry concepts, developing environmentally friendly synthesis methods will also become an important research direction.
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