enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Amide - Wikipedia

    en.wikipedia.org/wiki/Amide

    [4] [5] The amide group is called a peptide bond when it is part of the main chain of a protein, and an isopeptide bond when it occurs in a side chain, as in asparagine and glutamine. It can be viewed as a derivative of a carboxylic acid ( R−C(=O)−OH ) with the hydroxyl group ( −OH ) replaced by an amine group ( −NR′R″ ); or ...

  3. Electrophilic aromatic directing groups - Wikipedia

    en.wikipedia.org/wiki/Electrophilic_aromatic...

    Due to the electronegativity difference between carbon and oxygen / nitrogen, there will be a slight electron withdrawing effect through inductive effect (known as the –I effect). However, the other effect called resonance add electron density back to the ring (known as the +M effect) and dominate over that of inductive effect.

  4. Amino esters - Wikipedia

    en.wikipedia.org/wiki/Amino_esters

    Structurally, amino esters consist of three molecular components: a lipophilic part (ester); an intermediate aliphatic chain; a hydrophilic part (amine); The chemical linkage between the lipophilic part and the intermediate chain can be of the amide-type or the ester-type, and is the general basis for the current classification of local anesthetics.

  5. Dextran drug delivery systems - Wikipedia

    en.wikipedia.org/wiki/Dextran_drug_delivery_systems

    Therapeutic agents can be linked to dextran via an ester bond which can be hydrolyzed slowly by esterases to produce sustained, stable drug release. Drug-dextran complexes can also be formed by chemical linkage through an amide bond, which is hydrolyzed by amidase. Prodrugs coupled by amide bonds provide much slower drug release than by ester ...

  6. Depsipeptide - Wikipedia

    en.wikipedia.org/wiki/Depsipeptide

    Example of a depsipeptide with 3 amide groups (highlighted blue) and one ester group (highlighted green). R 1 and R 3 are organic groups (e. g. methyl) or a hydrogen atom found in α-hydroxycarboxylic acids. R 2, R 4 and R 5 are organic groups or a hydrogen atom found in common amino acids.

  7. α,β-Unsaturated carbonyl compound - Wikipedia

    en.wikipedia.org/wiki/Α,β-Unsaturated_carbonyl...

    They also polymerize readily. Acrylic acid, its esters, and its amide derivatives feature the acryloyl group. α,β-Unsaturated dicarbonyls are also common. The parent compounds are maleic acid and the isomeric fumaric acid. Maleic acid forms esters, an imide, and an anhydride, i.e. diethyl maleate, maleimide, and maleic anhydride.

  8. AOL Mail

    mail.aol.com/m

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Acyl group - Wikipedia

    en.wikipedia.org/wiki/Acyl_group

    The two major resonance forms of an amide. Another factor that plays a role in determining the reactivity of acyl compounds is resonance. Amides exhibit two main resonance forms. Both are major contributors to the overall structure, so much so that the amide bond between the carbonyl carbon and the amide nitrogen has significant double bond ...