Solvent-Dependent Lithium Bridging in Allenyl−Propargyllithium Reagents
作者:Hans J. Reich、Jennifer L. Thompson
DOI:10.1021/ol990412g
日期:2000.3.1
The solution structures of two allenyl-propargyllithium reagents (6-Li and 7-Li) which give (13)C NMR chemical shifts intermediate between those expected for the allenyl and propargyl isomers have been studied by the Saunders isotope perturbation technique. Variable equilibrium isotope shifts were detected, showing that these reagents adopt structures ranging from equilibrating localized allenyl- and
Fleming, Ian; Lawrence, Nicholas J., Journal of the Chemical Society. Perkin transactions I, 1992, # 24, p. 3309 - 3326
作者:Fleming, Ian、Lawrence, Nicholas J.
DOI:——
日期:——
Fleming Ian, Lawrence Nicholas J., J. Chem. Soc. PerKin Trans. I, (1992) N 24, S 3309-3326
作者:Fleming Ian, Lawrence Nicholas J.
DOI:——
日期:——
Solution Structure and Stereochemistry of Alkyl- and Silyl-Substituted Allenyl-Propargyllithium Reagents
作者:Hans J. Reich、Johnathan E. Holladay、Tamara G. Walker、Jennifer L. Thompson
DOI:10.1021/ja991719d
日期:1999.10.1
broadening of the propargyl carbon by Li−C coupling. The reagent prepared by metalation of dicyclopropylacetylene (8P-Li) has a propargyl structure, but two related reagents with a cyclobutane spanning the 3,3-positions (37A-Li and 39A-Li) had allenyl structures. Several triorganosilyl-substituted reagents were also investigated. Those with silyl groups at the allenyl position (28A-Li, 31A-Li) are