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  2. Oligosaccharide nomenclature - Wikipedia

    en.wikipedia.org/wiki/Oligosaccharide_nomenclature

    An oligosaccharide has both a reducing and a non-reducing end. The reducing end of an oligosaccharide is the monosaccharide residue with hemiacetal functionality, thereby capable of reducing the Tollens’ reagent, while the non-reducing end is the monosaccharide residue in acetal form, thus incapable of reducing the Tollens’ reagent. [2]

  3. Hemiacetal - Wikipedia

    en.wikipedia.org/wiki/Hemiacetal

    Hemiacetals form in the reaction between alcohols and aldehydes or ketones. Using an acid catalyst, the reaction proceeds via nucleophilic attack of the carbonyl group by the alcohol. [4] A subsequent nucleophilic attack of the hemiacetal by the alcohol results in an acetal. [2] Solutions of simple aldehydes in alcohols mainly consist of the ...

  4. Acetal - Wikipedia

    en.wikipedia.org/wiki/Acetal

    Acetals are stable compared to hemiacetals but their formation is a reversible equilibrium as with esters.As a reaction to create an acetal proceeds, water must be removed from the reaction mixture, for example, with a Dean–Stark apparatus, lest it hydrolyse the product back to the hemiacetal.

  5. Timeline of space exploration - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_space_exploration

    This is a timeline of space exploration which includes notable achievements, first accomplishments and milestones in humanity's exploration of outer space. This timeline generally does not distinguish achievements by a specific country or private company, as it considers humanity as a whole.

  6. Polyoxymethylene - Wikipedia

    en.wikipedia.org/wiki/Polyoxymethylene

    Polyoxymethylene (POM), also known as acetal, [4] polyacetal, and polyformaldehyde, is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability. Short-chained POM (chain length between 8 and 100 repeating units) is also better known as paraformaldehyde (PFA).

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  8. Category:Spaceflight timelines - Wikipedia

    en.wikipedia.org/wiki/Category:Spaceflight_timelines

    Timeline of first images of Earth from space; List of International Space Station expeditions; List of human spaceflights to the International Space Station; Uncrewed spaceflights to the International Space Station; List of crew of the International Space Station; List of visitors to the International Space Station; List of interplanetary voyages

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