- 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...
- In
organic chemistry,
phosphonium coupling is a cross-coupling
reaction for
organic synthesis. It is a mild, efficient,
chemoselective and
versatile methodology...
-
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...
- Consequently, the
carbon anion is
trigonal pyramidal.[citation needed]
Phosphonium ylides are used in the
Wittig reaction, a
method used to
convert ketones...
- 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...
- (1 - A phosphite) with the
electrophilic alkyl halide (2) to give a
phosphonium salt as an
intermediate (3).
These intermediates are
occasionally stable...
-
group that
bears no
hydrogen atom, such as a
quaternary ammonium or
phosphonium cation (generally:
onium ions), and with a
negatively charged functional...
-
intermediate formed when
using a
carbodiimide reagent, an amidinium- or
phosphonium-reagent can be emplo****
These reagents have two parts: an electrophilic...
