Highly stereoselective tandem cyclizations of 5-hexenyllithiums: preparation of endo-2-substituted bicyclo[2.2.1]heptanes and 3-substituted trans-bicyclo[3.3.0]octanes
作者:William F. Bailey、Atmaram D. Khanolkar、Kaustubh V. Gavaskar
DOI:10.1021/ja00047a013
日期:1992.10
diolefinic alkyl iodides by low-temperature lithium-iodine exchange, proceeds via two highly stereoselective and totally regiospecific 5-exo-trig ring closures to deliver bicyclic alkyllithiums. Trapping of the organolithium product by addition of an electrophile cleanly affords functionalized bicyclic molecules in good yield. In this way both endo-2-substituted bicyclo[2.2.1]heptanes and 3-substituted
Kinetic Analysis of the Thermal Isomerizations Linking 1-(<i>E</i>)-Propenyl-2-methylcyclobutanes with (<i>Z</i>)- and (<i>E</i>)-1,5-Octadiene and 3-Ethylhexa-1,5-diene
作者:John E. Baldwin、Richard C. Burrell
DOI:10.1021/jp030826y
日期:2003.11.1
The gas-phase unimolecular thermal reactions of the cis and trans isomers of 1-(E)-propenyl-2-methylcyclobutane encompass a complex array of stereomutations, fragmentations, and structural isomerizations. The isomerizations linking 1-(E)-propenyl-2-methylcyclobutanes with (Z)- and (E)-1,5-octadiene and 3-ethylhexa-1,5-diene are governed by a nonhomogeneous system of differential equations which may
Prevost,C. et al., Bulletin de la Societe Chimique de France, 1964, p. 2485 - 2492
作者:Prevost,C. et al.
DOI:——
日期:——
Kinetics of Thermal Gas-Phase Isomerizations and Fragmentations of <i>cis</i>- and <i>trans</i>-1-(<i>E</i>)-Propenyl-2-methylcyclobutanes at 275 °C
作者:John E. Baldwin、Richard C. Burrell
DOI:10.1021/jo010867v
日期:2002.5.1
Kinetic studies of the thermalisomerization and fragmentation reactions exhibited by cis- and trans-1-(E)-propenyl-2-methylcyclobutanes at 275 degrees C in the gas phase have provided first-order rate constants for cis,trans interconversions of the cyclobutanes, 1,3-carbon migrations leading to 3,4- and 3,6-dimethylcyclohexenes, isomerizations providing directly and indirectly four acyclic dienes