38614-05-0Relevant articles and documents
Alkylphosphinites as Synthons for Stabilized Carbocations
Ochmann, Lukas,Kessler, Mika L.,Schreiner, Peter R.
, p. 1460 - 1464 (2022/03/01)
We present a new acid-free method for the generation of carbocations based on a redox condensation reaction that enables SN1 reactions with a variety of nucleophiles. We utilize readily synthesized phosphinites that are activated by diisopropyl azodicarboxylate to form betaine structures that collapse upon adding a pronucleophile, thereby yielding reactive carbocation intermediates. We also employ this approach for the alkylation of some bioactive molecules.
Base-Mediated O-Arylation of Alcohols and Phenols by Triarylsulfonium Triflates
Ming, Xiao-Xia,Tian, Ze-Yu,Zhang, Cheng-Pan
supporting information, p. 3370 - 3379 (2019/11/03)
A mild and efficient protocol for O-arylation of alcohols and phenols (ROH) by triarylsulfonium triflates was developed under transition-metal-free conditions. Various alcohols, including primary, secondary and tertiary, and phenols bearing either electron-donating or electron-withdrawing groups on the aryl rings were smoothly converted to form the corresponding aromatic ethers in moderate to excellent yields. The reactions were conducted at 50 or 80 °C for 24 h in the presence of a certain base and showed good functional group tolerance. The base-mediated arylation with asymmetric triarylsulfonium salts could selectively transfer the aryl groups of sulfoniums to ROH, depending on their inherent electronic nature. The mechanistic studies revealed that the reaction might proceed through the nucleophilic attack of the in situ formed alkoxy or phenoxy anions at the aromatic carbon atoms of the C?S bonds of triarylsulfonium cations to furnish the target products.
Copper(II)-catalyzed O-phenylation of alcohols with organobismuth(V) reagents: A convenient method for the synthesis of simple tert-alkyl phenyl ethers
Mukaiyama, Teruaki,Sakurai, Naoto,Ikegai, Kazuhiro
, p. 1140 - 1141 (2007/10/03)
A convenient method for copper(II)-catalyzed O-phenylation of simple alcohols with organobismuth(V) compounds under mild conditions is described. Treatment of tetraphenylbismuth fluoride (Ph4BiF) with various simple alcohols in the presence of
The structure, photochemical reactivity, and photophysical properties of adamantyl X-substituted aryl ethers and a comparison with the alkyl groups, methyl, tert-butyl, and allyl
Pincock,Pincock
, p. 1237 - 1252 (2007/10/03)
The structure, photophysical properties, and photochemistry of the adamantyl aryl ethers 1 in both methanol and cyclohexane have been examined. UV absorption spectra, 13C NMR chemical shifts, X-ray structures, and Gaussian calculations (B3LYP/6-31G(d)) indicate that these ethers adopt a 90° conformer in the ground state. In contrast, fluorescence spectra, excited singlet state lifetimes, and calculations (TDDFT) indicated a 0° conformer is preferred in the first excited singlet state S1. Irradiation in either solvent results in the formation of adamantane and the corresponding phenol as the major products, both derived from radical intermediates generated by homolytic cleavage of the ether bond. The 4-cyano substituted ether 1j was the only one to form the ion-derived product, 1-methoxyadamantane (16% yield), on irradiation in methanol. Rate constants of bond cleavage for these ethers from S1 were estimated by two different methods by comparison with the unreactive anisoles 2, but the effect of substituents was too small to determine structure-reactivity correlations. The temperature dependence of the quantum yields of the fluorescence of the unsubstituted, 4-methoxy and 4-cyano derivatives of 1 and 2 were also determined. These results indicated that the activated process for 1 was mainly bond cleavage for the 4-cyano substrate whereas for 2, it was internal conversion and intersystem crossing.
REACTION OF PHENOL WITH 1-HYDROXYADAMANTANE IN THE PRESENCE OF ALUMINUM DIPHENYL DITHIOPHOSPHATE
Koshchii, V. A.,Kozlikovskii, Ya. B.,Yurchenko, A. G.
, p. 1733 - 1736 (2007/10/02)
The reaction of phenol with 1-hydroxyadamantane in the presence of aluminum diphenyl dithiophosphate leads to a mixture of mono-, di-, and tri(1-adamantyl)phenols and 1-adamantyl phenyl ether.As a rule the 2-(1-adamantyl)phenol predominates in the mixture.
REACTION OF exo-2-NORBORNYL AND 1-ADAMANTYL p-TOLUENESULFONATES WITH SODIUM PHENOXIDE IN TETRAHYDROFORAN. IONIZATION OF THE SUBSTRATES UNDER "APPARENTLY-SN2" CONDITIONS
Takeuchi, Ken'ichi,Kato,Yukari,Moriyama, Takamasa,Okamoto, Kunio
, p. 935 - 938 (2007/10/02)
exo-2-Norbornyl and 1-adamantyl tosylates react with sodium phenoxide in tetrahydrofuran via ionization, most probably through a cyclic transition state.The results call for attention in interpreting substitution reactions under "apperently-SN2" conditions.