The lithiation of primary and secondary dialkylsulfates with an excess of lithium powder in the presence of a catalytic amount of naphthalene (4 mol %) in THF at −78°C leads to the corresponding alkyllithium reagents (1:2 molar ratio) which react with different electrophiles, mainly carbonyl compounds, to yield after hydrolysis, the expected coupling products. This methodology represents an indirect
Reversal of the benzophenone reactivity upon η5-complexation to bis (η-cyclopentadienyl) zirconium
作者:Frank Rosenfeldt、Gerhard Erker
DOI:10.1016/s0040-4039(00)77773-2
日期:1980.1
Reversal of the carbonyl activity of benzophenone, serving as electron donor in single-electron transfer processes and acting as a proton acceptor through the ‘carbonyl’ carbon atom, is observed upon η2-complexation to zirconocene.
Naphthalene-catalysed lithiation of dialkyl sulfates: A new route for organolithium reagents
作者:David Guijarro、Balbino Mancheño、Miguel Yus
DOI:10.1016/s0040-4039(00)61156-5
日期:1992.9
The lithiation of primary and secondary dialkyl sulfates with an excess of lithium powder in the presence of a catalytic amount of naphthalene at −78°C leads to the corresponding alkyl-lithium reagents (1:2 molar ratio), which react with different electrophiles, mainly carbonyl compounds, to yield the expected coupling products. This methodology represents an indirect way for transforming alcohols
Regio- and stereo-selectivity correlation of the Wittig rearrangement
作者:Eric Hebert、Zoltan Welvart
DOI:10.1039/c39800001035
日期:——
The [1,2]- and [1,6]-rearrangements of s-octyl benzhydryl ether gave products in equal amounts whose formation occurred with 20% retention of configuration, and with complete recemization, for the [1,2]- and the [1,6]-products respectively; these results can be rationalized either by the formation of different non-equilibrating singlet radical pair intermediates, or by an important product formation