Regioselective Oxygenations of <i>S</i>-<i>Trans</i> Dienes, Silyl Dienol Ethers (SDEs), by Triphenyl Phosphite Ozonide (TPPO) and Its Mechanistic Study
作者:Atsushi Mori、Manabu Abe、Masatomo Nojima
DOI:10.1021/jo015562v
日期:2001.5.1
The direct oxygenation of s-trans dienes, silyl dienol ethers (SDEs) 2, by triphenyl phosphite ozonide (TPPO) has been examined in detail. The regioselective oxygenation was found to give hydroperoxide 3, alcohol 4, ketone 5, dimer 6, and peroxy phosphate 7 with concomitant formation of triphenyl phosphate 8 and diphenyl trimethylsilyl phosphate 10. The formation of peroxy phosphate 7 was found for
Pyridine catalyzed decomposition of triphenylphosphite ozonide
作者:D. V. Kazakov、N. N. Kabal'nova、V. V. Shereshovets
DOI:10.1007/bf00696914
日期:1995.5
Pyridine accelerates the decomposition of triphenylphosphite ozonide in CH2Cl2. The addition of ethanol to the (PhO)3PO3-C5H5N-CH2Cl2 system increases the rate of the process. The kinetic regularities of the decomposition of (PhO)3PO3 in the presence of pyridine, ethanol-pyridine, and propan-2-ol-pyridine mixtures in CH2Cl2 are studied.
Successive displacements of phenoxy by methoxy groups in triphenyl phosphite ozonide: mechanism of the accelerated singlet oxygen formation with pyridine and methanol
作者:Paul D. Bartlett、Charles M. Lonzetta
DOI:10.1021/ja00345a054
日期:1983.4
A Reexamination of the Ozone−Triphenyl Phosphite System. The Origin of Triphenyl Phosphate at Low Temperatures
作者:G. David Mendenhall、Duane B. Priddy
DOI:10.1021/jo982339y
日期:1999.8.1
The reaction of ozone with triphenyl phosphite (P) at -78 degrees C affords a labile 1:1 complex (PO3) together with small amounts of triphenyl phosphate (PO) (Q. E. Thompson, J. Am. Chem. Sec. 1961, 83, 845). In this work we found that the amount of PO present initially after complete ozonation of P in toluene was 12 +/- 2% at -78 degrees C and 11 +/- 2% at -95 degrees C. Partial ozonation of solutions of P in toluene at -78 degrees C gave mixtures of P, PO, and PO3 whose composition changed with time as a result of the reaction of P with PO3 to give additional PO. Between -25 and -60 degrees C, the rate constant of the latter reaction is given by the expression log k (M-1 s(-1)) = (8.64 +/- 0.04) - (11.44 +/- 0.74) kcal/RT. This reaction at -78 degrees C is too slow to account for the PO formed during the ozonation, which is proposed to arise instead by competitive reactions of an intermediate. The solubility of PO in toluene at -78 degrees C was measured as 0.06 M, and that of PO3 about 6 times greater.
Mechanism of the direct reaction of phosphite ozonides with olefins