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Aldehydes and Ketones with Water: Hydrate Formation01:20

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An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
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In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
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Acid-Catalyzed Hydration of Alkenes02:45

Acid-Catalyzed Hydration of Alkenes

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Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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Physical Properties of Ethers

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An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
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As shown in Figure 1, under acidic conditions, the β-hydroxy ketone undergoes dehydration via an E1 elimination reaction to form an enone.
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Hydration/Dehydration Behavior of Hydroxyethyl Cellulose Ether in Aqueous Solution.

Kengo Arai1, Toshiyuki Shikata1,2

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Molecules (Basel, Switzerland)
|October 20, 2020
PubMed
Summary

Hydroxyethyl cellulose (HeC) exhibits superior water solubility across temperatures due to its high hydration number. This is primarily driven by the behavior of its hydroxyethyl substitution groups, unlike other cellulose ethers.

Keywords:
chemically modified cellulose etherdehydrationdielectric spectroscopyhydrationhydroxyethyl cellulosemethyl celluloserelaxation time

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Area of Science:

  • Polymer Science
  • Physical Chemistry
  • Materials Science

Background:

  • Nonionic cellulose ethers like methyl cellulose (MC) and hydroxypropylmethyl cellulose (HpMC) exhibit temperature-dependent solubility, often showing cloud points at elevated temperatures.
  • Hydroxyethyl cellulose (HeC) is known for its exceptional water solubility, even at high temperatures where other cellulose ethers precipitate.
  • Understanding the molecular basis for HeC's enhanced solubility is crucial for its application in various industries.

Purpose of the Study:

  • To investigate the reason behind the high water solubility of Hydroxyethyl cellulose (HeC) over a wide temperature range.
  • To examine the temperature dependence of the hydration number (nH) in HeC samples with varying molar substitution (MS).
  • To elucidate the role of hydroxyethyl substitution groups in controlling HeC's hydration and solubility behavior.

Main Methods:

  • Utilized extremely high frequency dielectric spectrum measuring techniques (up to 50 GHz) to determine hydration numbers.
  • Studied HeC samples with molar substitution (MS) ranging from 1.3 to 3.6.
  • Measured hydration numbers across a temperature range of 10 to 70 °C.

Main Results:

  • All examined HeC samples remained soluble and did not exhibit cloud points between 10-70 °C.
  • The hydration number (nH) for HeC (MS=1.3) was 14 at 20 °C, gently decreasing to 10 at 70 °C.
  • HeC hydration numbers were significantly higher than the critical value (~5) required for cellulose ether solubility, even at high temperatures.

Conclusions:

  • HeC maintains high water solubility across a broad temperature range due to a substantial hydration number.
  • The temperature dependence of hydration in HeC is gentle and closely mirrors that of triethylene glycol, a model for its substitution groups.
  • The hydroxyethyl substitution groups are the primary determinants of HeC's hydration and dehydration behavior, thus controlling its wide-ranging solubility.