tert-Butyldimethylsilyldihalomethyllithium as a dihalomethylene dianion synthon. 1,3-Rearrangement and 1,4-rearrangement of silyl group from carbon to oxide
One-pot synthesis of R1CH(OSiMe2-t-Bu)CX2CH(OH)R2 (X = Cl, Br) by successive addition of two different aldehydes (R1CHO and R2CHO) has been achieved starting from tert-butyldimethylsilyldihalomethyllithium. Treatment of a THF solution of the title carbanion (X = Cl) with p-MeOC6H4CHO or n-BuCHO followed by an addition of HMPA and benzaldehyde gave the corresponding 1,3-diol monosilyl ether in 83% or 45% yield, respectively. The use of oxirane in place of aldehyde as the first electrophile followed by addition of benzaldehyde provided 1,4-diol monosilyl ether.
Bis(methylene)phosphoranes - Synthesis, Spectroscopic Investigations and Thermal Isomerizations to λ3-Phosphiranes
A great number of differently substituted bis(methylene)phosphoranes 10 2> are obtained by nucleophilic substitution from bis-chlorophosphorane (8).The reactions of dichlorophosphanes 1 and methylenephosphanes
Becker, Petra,Brombach, Heike,David, Gabriele,Leuer, Martina,Metternich, Hans-Juergen,Niecke, Edgar
p. 771 - 782
(2007/10/02)
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