In chemistry, the term phosphonium (more obscurely: phosphinium) describes polyatomic cations with the chemical formula PR+ 4 (where R is a hydrogen or...

olefination is a chemical reaction of an aldehyde or ketone with a triphenyl phosphonium ylide called a Wittig reagent. Wittig reactions are most commonly used...

Consequently, the carbon anion is trigonal pyramidal.[citation needed] Phosphonium ylides are used in the Wittig reaction, a method used to convert ketones...

In organic chemistry, phosphonium coupling is a cross-coupling reaction for organic synthesis. It is a mild, efficient, chemoselective and versatile methodology...

to be sold commercially. Wittig reagents are usually prepared from a phosphonium salt, which is in turn prepared by the quaternization of triphenylphosphine...

dialkylthiophosphinate ester.: 55  Compounds with the formula [PR4+]X− comprise the phosphonium salts. These species are tetrahedral phosphorus(V) compounds. From the...

Phosphonium iodide is a chemical compound with the formula PH 4I. It is an example of a salt containing an unsubstituted phosphonium cation (PH+ 4). Phosphonium...

group that bears no hydrogen atom, such as a quaternary ammonium or phosphonium cation (generally: onium ions), and with a negatively charged functional...

(1 - A phosphite) with the electrophilic alkyl halide (2) to give a phosphonium salt as an intermediate (3). These intermediates are occasionally stable...

intermediate formed when using a carbodiimide reagent, an amidinium- or phosphonium-reagent can be employed These reagents have two parts: an electrophilic...

Decyl(triphenyl)phosphonium (DTPP) is the organophosphorus cation with the formula C10H21P(C6H5)3+. It is a lipophilic quaternary phosphonium cation. It forms...

synthesis of alkenes from aldehydes and ketones using compounds called phosphonium ylides in the Wittig reaction. He shared the Nobel Prize in Chemistry...

Tetrakis(hydroxymethyl)phosphonium chloride (THPC) is an organophosphorus compound with the chemical formula [P(CH2OH)4]Cl. It is a white water-soluble...

by analogy with the corresponding phosphonium salts, which bear a positive carbon atom instead of the phosphonium residue. Later, it was shown by X-ray...

Phosphonate Phosphite Phosphonous Phosphinate Phosphine oxide Phosphine Phosphonium Phosphaalkene Phosphaalkyne Phosphaallene Sulfur Thiol Sulfide Sulfonium...

but acid and base activity is poor. Proton exchange proceeds via a phosphonium (PH+4) ion in acidic solutions and via phosphanide (PH−2) at high pH...

Bis(triphenylphosphine)iminium chloride is the chloride salt of a bulky lipophilic phosphonium cation [Ph3PNPPh3]+. Tetraphenylphosphonium chloride (C6H5)4PCl, abbreviated...

Phosphonate Phosphite Phosphonous Phosphinate Phosphine oxide Phosphine Phosphonium Phosphaalkene Phosphaalkyne Phosphaallene Sulfur Thiol Sulfide Sulfonium...

reagent PyBOP Mansour, Tarek S.; Bardhan, Sujata; Wan, Zhao-Kui (2010). "Phosphonium- and Benzotriazolyloxy-Mediated Bond-Forming Reactions and Their Synthetic...

base, e.g., for the deprotonation of ketones to form sodium enolates, phosphonium salts to form Wittig reagents, and formamidinium salts to form diaminocarbenes...

methyltributylammonium chloride. Organic phosphonium salts are also used, e.g., hexadecyltributylphosphonium bromide. The phosphonium salts tolerate higher temperatures...

the acid and base. Phosphonium cations (R4P+) are less common but offer some advantageous properties. Some examples of phosphonium cations are...

located on a quaternary ammonium group. Similarly, a molecule containing a phosphonium group and a carboxylate group cannot isomerize. Tautomerism of amino...

Phosphonate Phosphite Phosphonous Phosphinate Phosphine oxide Phosphine Phosphonium Phosphaalkene Phosphaalkyne Phosphaallene Sulfur Thiol Sulfide Sulfonium...

Phosphonate Phosphite Phosphonous Phosphinate Phosphine oxide Phosphine Phosphonium Phosphaalkene Phosphaalkyne Phosphaallene Sulfur Thiol Sulfide Sulfonium...

Kohlenwasserstoffe durch Jodphosphonium" [On the reduction of aromatic compound by phosphonium iodide [H4IP]]. Annalen der Chemie und Pharmacie. 55: 266–281. Bei der...

compound with the formula [(C6H5)3PCH3]Br. It is the bromide salt of a phosphonium cation. It is a white salt that is soluble in polar organic solvents...

tertiary phosphines are treated with alkyl halides, the products being phosphonium salts. Thiols are readily alkylated to give thioethers via the thiol-ene...

reaction with an electrophile gives a resonance stabilized cation With phosphonium ylides in the Wittig reaction to give the alkenes With thiols to give...

triphenylphosphine dichloride ([PPh3Cl]Cl), which exists as the moisture-sensitive phosphonium halide. This reagent is used to convert alcohols to alkyl chlorides in...