enow.com Web Search

Search results

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

    en.wikipedia.org/wiki/Pyridinecarboxylic_acid

    A pyridinecarboxylic acid is any member of a group of organic compounds which are monocarboxylic derivatives of pyridine. Pyridinecarboxylic acid comes in three isomers: Picolinic acid (2-pyridinecarboxylic acid) Nicotinic acid (3-pyridinecarboxylic acid), also known as Niacin; Isonicotinic acid (4-pyridinecarboxylic acid)

  3. Phenylboronic acid - Wikipedia

    en.wikipedia.org/wiki/Phenylboronic_acid

    Phenylboronic acid or benzeneboronic acid, abbreviated as PhB(OH) 2 where Ph is the phenyl group C 6 H 5 - and B(OH) 2 is a boronic acid containing a phenyl substituent and two hydroxyl groups attached to boron. Phenylboronic acid is a white powder and is commonly used in organic synthesis.

  4. Tris(pentafluorophenyl)borane - Wikipedia

    en.wikipedia.org/wiki/Tris(pentafluorophenyl)borane

    B(C 6 F 5) 3 forms a strong Lewis adduct with water, [5] which was shown to be a strong Brønsted acid having an acidity comparable to hydrochloric acid (in acetonitrile). [6] In consequence, even traces of moisture are able to deactivate B(C 6 F 5 ) 3 and remaining catalytic activity might only be due to the Brønsted acidity of the water adduct.

  5. Borylation - Wikipedia

    en.wikipedia.org/wiki/Borylation

    The boron atom of a boronic ester or acid is sp 2 hybridized possessing a vacant p orbital, enabling these groups to act as Lewis acids. The C–B bond of boronic acids and esters are slightly longer than typical C–C single bonds with a range of 1.55-1.59 Å.

  6. Boronic acid - Wikipedia

    en.wikipedia.org/wiki/Boronic_acid

    The general structure of a boronic acid, where R is a substituent.. A boronic acid is an organic compound related to boric acid (B(OH) 3) in which one of the three hydroxyl groups (−OH) is replaced by an alkyl or aryl group (represented by R in the general formula R−B(OH) 2). [1]

  7. Protodeboronation - Wikipedia

    en.wikipedia.org/wiki/Protodeboronation

    This protocol has proved useful in the cross-coupling of some notoriously unstable boronic acids, such as the 2-pyridine boronic acid. [ 16 ] [ 17 ] This ensures that the boronic acid concentration is low during the cross-coupling reaction, which in turn minimises the potential for side reactions.

  8. Pyridinium - Wikipedia

    en.wikipedia.org/wiki/Pyridinium

    It is the conjugate acid of pyridine. Many related cations are known involving substituted pyridines, e.g. picolines, lutidines, collidines. They are prepared by treating pyridine with acids. [3] As pyridine is often used as an organic base in chemical reactions, pyridinium salts are produced in many acid-base reactions.

  9. Thiocarboxylic acid - Wikipedia

    en.wikipedia.org/wiki/Thiocarboxylic_acid

    C 6 H 5 C(O)Cl + KSH → C 6 H 5 C(O)SH + KCl. Covalent sulfides, such as P 2 S 5, generally give poor yields unless catalyzed with triphenylstibine oxide. [6] 2,6-Pyridinedicarbothioic acid is synthesized by treating the diacid dichloride with a solution of H 2 S in pyridine: NC 5 H 3 (COCl) 2 + 2 H 2 S + 2 C 5 H 5 N → [C 5 H 5 NH +][HNC 5 H ...