Cyclopropenation of alkylidene carbenes derived from α-silyl ketones
A new cyclopropanation reaction involving Cα-Si bond insertion of alkylidene carbenes derived from α-silyl ketones has been developed. This unprecedented alkylidene carbene reactivity features excellent selectivity for insertion into Cα-Si bonds rather than insertion into Cγ-H bonds or addition to,δ-double or -triple bonds. The selectivity trend clearly indicates that the α-oxygen in the tether significantly promotes Cγ-H insertion, although the Cα-Si bond insertion still competes effectively.
Li, Jingwei,Sun, Chunrui,Lee, Daesung
supporting information; experimental part
p. 6640 - 6641
(2010/07/04)
Process for preparing substituted cyclic acetals of oxyacetaldehydes and said cyclic acetals
A process is described for the preparation of substituted oxyacetaldehydes and cyclic acetals thereof according to the reaction sequence: STR1 wherein R1 and R2, taken together form a lower alkylene group; wherein R3 is alkyl, alkenyl or alkadienyl and X is halogen selected from the group consisting of chlorine and bromine, the reaction (i) being carried out (1) using a phase transfer agent and (2) in a two phase system.
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(2008/06/13)
Process for preparing substituted oxyacetaldehydes and acetals thereof
A process is described for the preparation of substituted oxyacetaldehydes and acetals thereof according to the reaction sequence: STR1 WHEREIN R1 and R2 are each lower alkyl or R1 and R2, taken together form a lower alkylene group; wherein R3 is alkyl, alkenyl or alkadienyl and X is halogen selected from the group consisting of chlorine and bromine, the reaction (i) being carried out (1) using a "phase transfer agent" and (2) in a two phase system.
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(2008/06/13)
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