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Carbonyls allenyl. rearrangements with

Ethynyl carbinols (propargylic alcohols) such as 134 (Scheme 2.58) represent another important group of oxidation level 3 compounds. Their preparation involves nucleophilic addition of acetylides to the carbonyl group, a reaction that is nearly universal in its scope. Elimination of water from 134 followed by hydration of the triple bond is used as a convenient protocol for the preparation of various conjugated enones 135. Easily prepared O-acylated derivatives are extremely useful electrophiles in reactions with organocuprates, which proceed with propargyl-allenyl rearrangements to furnish allene derivatives 136. [Pg.109]

See other pages where Carbonyls allenyl. rearrangements with is mentioned: [Pg.57]    [Pg.61]    [Pg.92]    [Pg.116]    [Pg.21]    [Pg.386]    [Pg.675]    [Pg.677]    [Pg.3962]    [Pg.284]    [Pg.117]    [Pg.112]    [Pg.675]    [Pg.675]    [Pg.677]    [Pg.114]    [Pg.3961]    [Pg.2373]    [Pg.744]    [Pg.166]    [Pg.59]    [Pg.266]   
See also in sourсe #XX -- [ Pg.470 ]



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Allenyl

Allenylation

Rearrangements with

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