Microwave-Assisted Organocatalyzed Rearrangement of Propargyl Vinyl Ethers to Salicylaldehyde Derivatives: An Experimental and Theoretical Study
作者:David Tejedor、Leandro Cotos、Daniel Márquez-Arce、Mikel Odriozola-Gimeno、Miquel Torrent-Sucarrat、Fernando P. Cossío、Fernando García-Tellado
DOI:10.1002/chem.201503171
日期:2015.12.7
monocycles to complex fused polycyclic systems. The reaction is highly regioselective and takes place under symmetry‐breaking conditions. The preparative power of this reaction was demonstrated in the first total synthesis of morintrifolin B, a benzophenone metabolite isolated from the small tree Morinda citrifolia L. A DFT study of the reaction was performed with full agreement between calculated values and
Contemporaneous Dual Catalysis: Chemoselective Cross-Coupling of Catalytic Vanadium–Allenoate and π-Allylpalladium Intermediates
作者:Barry M. Trost、Xinjun Luan、Yan Miller
DOI:10.1021/ja204817y
日期:2011.8.17
This paper presents a detailed investigation of a dual catalytic system that combines a vanadium-catalyzed Meyer-Schuster rearrangement and a palladium-catalyzedallylicalkylation. The implementation of this novel reaction relies on matching the formation rates of vanadium-allenoate and π-allylpalladium intermediates with their bimolecular coupling rate in order to minimize the undesired protonation
The Prevalence of Daytime Napping and Its Relationship to Nighttime Sleep
作者:June J. Pilcher、Kristin R. Michalowski、Renee D. Carrigan
DOI:10.1080/08964280109595773
日期:2001.1
Many healthy adults report daytime napping. Surprisingly few studies, however have examined spontaneous napping behavior especially very short naps, in healthy adults. The authors examined the prevalence of power naps (lasting less than 20 minutes) and longer naps (20 minutes or more) and their effects on nighttime sleep in a group of healthy young and middle-aged adults. The young and middle-aged adults reported very similar sleep and napping patterns, with approximately 74% of the participants in both groups reporting they had napped during a 7-day sleep-log period. Almost half of the participants reported that the average nap lasted less than 20 minutes. A multivariant analysis of variance (MANOVA) found no significant differences between the no-nap and the power-nap or long-nap groups in sleep quantity or quality for either age group. The current data suggested that power napping occurs frequently in healthy adults and that spontaneous napping does not negatively affect nighttime sleep.
Nasarow et al., Zhurnal Obshchei Khimii, 1958, vol. 28, p. 460,469; engl. Ausg. S. 451, 458
作者:Nasarow et al.
DOI:——
日期:——
Weiland; Arens, Recueil des Travaux Chimiques des Pays-Bas, 1956, vol. 75, p. 1358,1361, 1365