28691-76-1

Basic information

• Product Name: triphenyl[(1E)-prop-1-en-1-yl]phosphonium
• CAS NO: 28691-76-1
• Molecular Formula: Br*C₂₁H₂₀P
• Molecular Weight: 303.3567
• Mol File: 28691-76-1.mol
• Article Data: 6

Chemical Properties

• CAS DataBase Reference: triphenyl[(1E)-prop-1-en-1-yl]phosphonium(CAS DataBase Reference)
• NIST Chemistry Reference: triphenyl[(1E)-prop-1-en-1-yl]phosphonium(28691-76-1)
• EPA Substance Registry System: triphenyl[(1E)-prop-1-en-1-yl]phosphonium(28691-76-1)

Safety Data

• Hazardous Substances Data: 28691-76-1(Hazardous Substances Data)

Upstream product

• 1560-54-9 allyltriphenylphosphonium bromide 
• 107-86-8 3,3-dimethyl acrylaldehyde 
• 2091-46-5 triphenyl(prop-2-ynyl)phosphonium bromide 
• 603-35-0 triphenylphosphine 
• 75-56-9 methyloxirane 

Downstream Products

• 1515-78-2 buta-1,3-dien-1-ylbenzene 
• 34835-71-7 2,4,5-trimethyldiphenylmethane 

Relevant articles and documents

Synthesis of chiral β-aminophosphine oxides via novel azaboretidinium bromide salts

The enamino(triphenyl)phosphonium salts [Ph3PCH=CMeNR1R2]+ Br- [where R1 = R2 = (CH2)4, (CH2)5; (S)-CHMePh; R1 = H, R2 = (S)-CHMePh; R1 = H, R2 = (S)-(CH2)3-CH(CH2OH)] have been synthesised and have been shown to react with an excess of borane-tetrahydrofuran to give novel azaboretidinium salts - the first examples of four-membered C-B-N-C heterocycles. The structure of [(1S,3R,4S,1'S)-4-methyl-1-(1-phenylethyl)-1,2-azaboretidin-1-ium-2-uid-3-yl] triphenylphosphonium bromide has been established by X-ray crystallography. Borane does not result in any significant stereoselectivity in these reductions and the azaboretidinium salts are mixtures of diastereomers. In contrast, the similar reduction with (R)-(+)-monoisopinocampheylborane or (S)-(-)-monoisopinocampheylborane leads to single diastereomers in high yields when R1 and R2 are non-bulky; with sterically demanding groups the azaboretidinium salts are unstable and decompose on work-up. Heating these azaboretidinium salts with aqueous sodium hydroxide in methanol, or better, aqueous sodium hydroxide alone, results in the direct formation of the phosphine oxides, Ph2P(O)CH2CHMeNR1R2 which, in the case of compounds derived from IpC2BH2, have an ee value of >75%. In some cases, particularly when R1 and R2 are bulky, the use of sodium hydroxide in methanol results in an appreciable amount of rac-Ph2PCH2CHMe(OMe) as a by-product, but this can be avoided by carrying out the reactions in the absence of methanol.

Synthetic potential of the reaction of allylic phosphonium ylides with α, β-unsaturated carbonyl compounds

The reaction of triphenylphosphonium-2-propenylide (14) with mesityl oxide (9) is shown to proceed via initial Michael addition followed by trans ylidation and an intramolecular Wittig condensation to yield 1,5,5-trimethyl- 1,3-cyclohexadiene (10) as the reaction product.

Synthesis and X-Ray Crystal Structure of (1S,3R,4S,1'S)-4-Methyl-3-triphenylphosphonium-1--2-hydrido-2-borazetidinium Bromide - the First Example of a Four-membered Heterocycle

The title compound and related derivatives are synthesised from enamino(triphenyl)phosphonium salts and borane, and converted into β-aminophosphonium salts and β-aminophosphine oxides containing two chiral centres.