enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. 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.

  3. Category:Cyclic acetals - Wikipedia

    en.wikipedia.org/wiki/Category:Cyclic_acetals

    Cyclic acetals with aldehydes (6 P) Cyclopentanonides (2 P) P. Pentanonides (2 P) S. Steroid cyclic ketals (1 C, 3 P) This page was last edited on 1 April 2018, at 20

  4. 3,9-Divinyl-2,4,8,10-tetraoxaspiro (5.5)undecane - Wikipedia

    en.wikipedia.org/wiki/3,9-Divinyl-2,4,8,10-tetra...

    Condensation products from propenal and pentaerythritol were first described in 1950. [4] [5] The synthesis is carried using a general synthesis method for acetals at acid pH (pH 3-5) by reacting an alcohol with an excess of aldehyde, which is stabilized with hydroquinone in the case of propenal, which tends to polymerize at elevated temperature.

  5. Spiro compound - Wikipedia

    en.wikipedia.org/wiki/Spiro_compound

    Particularly common spiro compounds are ketal (acetal) formed by condensation of cyclic ketones and diols and dithiols. [15] [16] [17] A simple case is the acetal 1,4-dioxaspiro[4.5]decane from cyclohexanone and glycol. Cases of such ketals and dithioketals are common.

  6. Protecting group - Wikipedia

    en.wikipedia.org/wiki/Protecting_group

    Cyclic acetals are very much more stable against acid hydrolysis than acyclic acetals. Consequently acyclic acetals are used practically only when a very mild cleavage is required or when two different protected carbonyl groups must be differentiated in their liberation.

  7. Category:Acetals - Wikipedia

    en.wikipedia.org/wiki/Category:Acetals

    Cyclic acetals (8 C) H. Hemiacetals (1 C, 2 P) K. Ketals (1 C, 11 P) Pages in category "Acetals" The following 17 pages are in this category, out of 17 total.

  8. Acetalated dextran - Wikipedia

    en.wikipedia.org/wiki/Acetalated_dextran

    The ratio of cyclic to acyclic acetals varies with reaction time since acyclic acetals are kinetically favored and cyclic acetals are the thermodynamically favored. [5] This unique formation of cyclic and acyclic acetals leads to varying degradation time because the two acetal groups hydrolyze at different rates.

  9. Hemiacetal - Wikipedia

    en.wikipedia.org/wiki/Hemiacetal

    Cyclic hemiacetals often form readily, especially when they are 5- and 6-membered rings. In this case, a hydroxy group reacts with a carbonyl group within the same molecule to undergo an intramolecular cyclization reaction. [6] Formation of a general cyclic hemiacetal Structures of some readily isolable hemiacetals and hemiketals.