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Acid chlorides Tebbe reaction

A limitation of the methylenation of carboxylic acid derivatives with Tebbe-type reagents such as 3 and 11 is that highly electrophilic acid anhydrides and acid halides cannot be transformed to the corresponding enol esters or alkenyl halides. The reaction of titanocene-methylidene generated from 11 with add chlorides results in the formation of acylation products via titanium enolates 12 [44] rather than methylenation. Since the titanium enolates 12 are stable and do not isomerize to the more highly substituted enolates, they are useful for regioselective aldol reactions (Scheme 4.11) [44a]. Although similar titanium enolates are also produced... [Pg.160]

See other pages where Acid chlorides Tebbe reaction is mentioned: [Pg.743]    [Pg.743]    [Pg.743]    [Pg.499]    [Pg.286]    [Pg.672]    [Pg.660]    [Pg.222]    [Pg.301]    [Pg.9]    [Pg.321]    [Pg.72]   
See also in sourсe #XX -- [ Pg.743 ]

See also in sourсe #XX -- [ Pg.743 ]



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Acid chlorides, reactions

Tebbe

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