15022-08-9Relevant articles and documents
Highly efficient Tsuji-Trost allylation in water catalyzed by Pd-nanoparticles
Llevot,Monney,Sehlinger,Behrens,Meier
, p. 5175 - 5178 (2017)
Palladium nanoparticles stabilized by poly(vinylpyrrolidone) catalyze Tsuji-Trost allylations in water with very high turnover numbers. The di-allylation of methylene active compounds and the allylation of bio-based phenols was performed in high yield. The allylation of lignin showed a high selectivity towards the phenolic OH groups.
Nefedov et al.
, (1973)
Direct Synthesis of Diallyl Carbonate Via Urea Transesterification with Allyl Alcohol Over Metal Chlorides
Wang, Dengfeng,Zhang, Xuelan,Luo, Hainan,Wei, Shuwei,Zhao, Xueying
, p. 1067 - 1074 (2019)
A promising technique was studied towards diallyl carbonate (DAC) manufacture via urea transesterification with allyl alcohol over several metallic chlorides. It was revealed that the intermediate allyl carbamate (AC) was first generated via urea mono-alcoholysis with high yield, and subsequently AC further reacted with another allyl alcohol molecule to produce DAC. All the metal halides were evaluated for the overall reaction and the reaction of AC and allyl alcohol, respectively. This work found that the catalytic ability of catalysts originated from metal ions. Importantly, the highest yield of DAC could be achieved using LaCl3 as catalyst. In addition, the activation patterns of reactants were investigated using in situ FT-IR measurement. Based on the characterization results of X-ray power diffraction and elemental analysis of the lanthanum species, separated from the reaction conduced over LaCl3, a possible reaction mechanism was speculated. Graphical Abstract: [Figure not available: see fulltext.].
The design of efficient carbonate interchange reactions with catechol carbonate
Tabanelli,Monti,Cavani,Selva
, p. 1519 - 1528 (2017/05/01)
Catechol carbonate (CC) has been investigated as an innovative and highly active reactant for carbonate interchange reactions (CIRs). Under mild conditions (atmospheric pressure, and 60-80°C), the selective synthesis of symmetric aliphatic carbonates (ROCO2R) has been achieved by the reaction of a slight excess of both primary and secondary alcohols with CC in the presence of NaOMe or MgO as a catalyst. Quantitative conversions have been reached in only 1 hour and products have been isolated in yields of up to 58% for dibutylcarbonate. Of note is that the reaction of glycerol with CC also proceeded under similar conditions (40-60°C, 1 atm) to afford glycerol carbonate (96-98%). The comparison of the reactivity of CC with that of conventional dialkyl carbonates, including dimethyl carbonate (DMC) and ethylene carbonate (EC), proved the superior performance of CC in all the investigated CIR processes. Accordingly, a mechanism has been formulated based on the leaving group ability of a catecholate anion originating from CC.