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Triphenylphosphite is a notable example of polyamorphism in organic compounds, namely it exists in two different amorphous forms at temperatures about 200 K. [5] One polymorphic modification of triphenyl phosphite was obtained by means of crystallization in ionic liquids. [6]
The phosphorus-containing product is triphenylphosphine sulfide, Ph 3 PS. This reaction can be employed to assay the "labile" S 0 content of a sample, say vulcanized rubber. Triphenylphosphine selenide, Ph 3 PSe, may be easily prepared via treatment of PPh 3 with red (alpha-monoclinic) Se. Salts of selenocyanate, SeCN −, are used as the Se 0 ...
Triphenyl phosphate (TPhP) is the chemical compound with the formula OP(OC 6 H 5) 3. It is the simplest aromatic organophosphate. This colourless solid is the ester (triester) of phosphoric acid and phenol. It is used as a plasticizer and a fire retardant in a wide variety of settings and products. [3]
In the case of trimethylphosphine, triphenyl phosphite is used in place of the highly electrophilic PCl 3: [6] 3 CH 3 MgBr + P(OC 6 H 5) 3 → P(CH 3) 3 + 3 C 6 H 5 OMgBr. Slightly more elaborate methods are employed for the preparation of unsymmetrical tertiary phosphines, with the formula R 2 R'P. The use of organophosphorus-based ...
The reaction mechanism of the Mitsunobu reaction is fairly complex. The identity of intermediates and the roles they play has been the subject of debate. Initially, the triphenyl phosphine (2) makes a nucleophilic attack upon diethyl azodicarboxylate (1) producing a betaine intermediate 3, which deprotonates the carboxylic acid (4) to form the ion pair 5.
Aryl phosphite esters may not undergo these reactions and hence are commonly used as stabilizers in halogen-bearing polymers such as PVC. Autoxidation of a keto steroid with oxygen to the hydroperoxide (not depicted) followed by reduction with triethylphosphite to the alcohol. Phosphite esters may be used as reducing agents in
Triphenylphosphine oxide (often abbreviated TPPO) is the organophosphorus compound with the formula OP(C 6 H 5) 3, also written as Ph 3 PO or PPh 3 O (Ph = C 6 H 5).It is one of the more common phosphine oxides.
The phosphorus reagent can be used in catalytic quantities. [5] [6] The corresponding alkyl bromide can also be synthesised by addition of lithium bromide as a source of bromide ions. A more sustainable version of the Appel reaction has been reported, which uses a catalytic amount of phosphine that is regenerated with oxalyl chloride. [7]