2-octyldodecyl 12-[(1-oxooctadecyl)oxy]octadecanoate NEW

Specification

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Simple Analogy

Think of it as a "double-tailed" or "branched" molecule designed to be very heavy and oily. Its main job is to act as a super-effective emollient (softener) and thickening agent in cosmetics, especially in lipsticks, foundations, and sunscreens.

Detailed Breakdown of the Name

The name follows IUPAC nomenclature rules. It's an ester, which is a compound formed from an alcohol and an acid. The name is structured as: "[Alkyl Group from the Alcohol] [Name of the Acid Part]".

Let's separate it at the key hyphen:

• Alcohol part: 2-octyldodecyl

  Acid part: 12-[(1-oxooctadecyl)oxy]octadecanoate

1. The Alcohol Part: 2-Octyldodecan-1-ol

This describes a very large, branched alcohol.

• Dodecanol: This means a 12-carbon chain (dodec-) with an alcohol group (-ol). By convention, the -ol is on carbon #1.

  2-Octyl: This means an 8-carbon chain (octyl) is attached to the second carbon of the dodecanol chain.

So, the alcohol has the structure: CH3-(CH2)7-CH[ (CH2)10-CH3 ]-CH2-OH
This creates a single, large, branched molecule with a total of 20 carbon atoms (8 + 1 + 11). This bulky structure is key to its properties.

2. The Acid Part: 12-[(1-oxooctadecyl)oxy]octadecanoic Acid

This is the complex part. It describes a fatty acid that has another fatty acid attached to it. The root is "octadecanoate".

• Octadecanoate: This is the ester form of octadecanoic acid, which is the systematic name for stearic acid (an 18-carbon saturated fatty acid).

The prefix 12-[(1-oxooctadecyl)oxy] tells us what modification has been made to this stearic acid chain:

• 1-Oxooctadecyl: Octadecyl is an 18-carbon chain. 1-oxo means a carbonyl group (C=O) is on the first carbon. So, 1-oxooctadecyl is another way of saying stearoyl, which is the acyl group of stearic acid (CH3-(CH2)16-C=O).

  oxy: This means the stearoyl group is attached via an oxygen atom.

  12-: This tells us that the "stearoyl-oxygen" group is attached to the 12th carbon of the main 18-carbon (octadecanoic acid) chain.

So, the acid part is a stearic acid molecule that has a second stearic acid molecule attached to its side via an ester linkage at the 12th carbon. This is often called a dimer acid-type structure.

Putting It All Together

2-Octyldodecyl 12-[(1-oxooctadecyl)oxy]octadecanoate is the ester formed when the bulky, branched 2-octyldodecan-1-ol reacts with the complex, dimer-like 12-[(stearoyl)oxy]stearic acid.

Structure Summary:

• A central core from the acid part, which is a long carbon chain with a branched ester.

  Three very long, saturated hydrocarbon "tails":

1. From the alcohol (the 2-octyldodecyl group).

2. The main chain of the acid (the octadecanoate).

3. The side chain attached to the acid (the 1-oxooctadecyl group).

This results in a massive, heavy molecule with a total of 56 carbon atoms (20 from the alcohol + 36 from the dimer acid).

A Common Name and Its Function

In the cosmetics industry, this ingredient is well-known by its INCI (International Nomenclature of Cosmetic Ingredients) name:

ETHYLHEXYL HYDROXYSTEARATE

• Ethylhexyl: A common name for the branched 2-ethylhexyl group, which is similar in structure and function to the 2-octyldodecyl group used here. Both provide branching.

  Hydroxystearate: Refers to the stearic acid derivative with a hydroxyl group (-OH), which is then esterified (in this case, with another stearic acid).

Primary Function and Use

This chemical is a premier skin conditioning agent and emollient. Its properties include:

• Excellent Spreadability: It leaves a non-greasy, silky feel on the skin.

  High Stability: It's resistant to oxidation and heat.

  Thickening: It helps to thicken oils and formulas.

  Water Resistance: It is a key ingredient in water-resistant sunscreens and long-wear makeup.

Because of its complex, multi-tailed structure, it doesn't crystallize easily and remains a liquid over a wide temperature range, making it very versatile in formulations.

In short, it's a high-performance synthetic oil used in cosmetics to create a luxurious, smooth, and non-greasy feel.

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