Higher-order cyclization reactions of alkenyl Fischer carbene complexes: a new selective all-carbon [8 + 2] cyclization with 8-methoxyheptafulvene and computational mechanistic analysis
作者:Jaime García-Rodríguez、Jairo González、Javier Santamaría、Ángel L. Suárez-Sobrino、Miguel A. Rodríguez
DOI:10.1039/c6dt01465h
日期:——
A new higher-order cyclizationreaction of alkenyl Fischercarbenecomplexes is described. Chromium and tungsten alkenyl Fischercarbenecomplexes react toward 8-methoxyheptafulvene through an all-carbon formal [8 + 2] cycloaddition reaction with complete regio- and stereoselectivity. Tetrahydroazulene compounds bearing four consecutive stereocenters are generated. The reaction mechanism is rationalized
Reppe et al., Justus Liebigs Annalen der Chemie, 1948, vol. 560, p. 1,41
作者:Reppe et al.
DOI:——
日期:——
Experimental/Computational Study of the Electrochemical Oxidation of Cyclooctatetraene in Protic Media. Solvent Effects
作者:Grayson Connors、Xin Wu、Albert J. Fry
DOI:10.1021/ol070349s
日期:2007.4.1
Electrochemical oxidation of cyclooctatetraene (COT) in methanol affords a ring-contracted acetal in high yield. Ring contraction is only a minor process in acetic acid. Ab initio computational methods were applied to understand and explain the effect of solvent. The computations show considerable differences between the thermodynamic and kinetic preferences for ring contraction vs bicyclo[4.2.0] product formation.