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Organotransition metal chemistry, alkyne

As a facile method of carbon-carbon bond formation, the insertion of carbon-carbon multiple bonds into carbon-transition-metal bonds is a very important fundamental reaction in organotransition-metal chemistry. However, in contrast to the tremendous number of reports about the insertion of carbon-carbon multiple bonds into carbon-transition-metal bonds, direct insertion of carbon-heteroatom multiple bonds, such as carbonyl and nitrile groups, without using stoichiometric organometallic reagents, has received scant attention.111 A palladium(II)-catalysed cycliza-tion reaction of alkynes with carbon-heteroatom multiple bonds under mild conditions has been developed, using insertion of carbon-heteroatom multiple bonds into the carbon-palladium bond as the key step.[2]... [Pg.185]

Organotransition metal chemistry. Alkyl and alkylidene derivatives. Complexes of alkenes and alkynes. [Pg.213]

Over the last decade, the chemistry of the carbon-carbon triple bond has experienced a vigorous resurgence [1]. Whereas construction of alkyne-con-taining systems had previously been a laborious process, the advent of new synthetic methodology based on organotransition metal complexes has revolutionized the field [2]. Specifically, palladium-catalyzed cross-coupling reactions between alkyne sp-carbon atoms and sp -carbon atoms of arenes and alkenes have allowed for rapid assembly of relatively complex structures [3]. In particular, the preparation of alkyne-rich macrocycles, the subject of this report, has benefited enormously from these recent advances. For the purpose of this review, we Emit the discussion to cychc systems which contain benzene and acetylene moieties only, henceforth referred to as phenylacetylene and phenyldiacetylene macrocycles (PAMs and PDMs, respectively). Not only have a wide... [Pg.82]

Previously in Chapter 12 we have seen several examples of cydization reactions that have involved transition metal catalysis. In Chapter 11, we introduced Mo- and Ru-catalyzed RCM as a means of converting acyclic dienes, alkene-alkynes, and dialkynes into rings containing carbon-carbon double and triple bonds. Section 12-5 will cover a few cases where organotransition metal complexes effectively promote the construction of rings where two or more C-C bond connections occur during the same transformation. Some examples will be extensions of reactions already covered, whereas others will entail new chemistry. [Pg.613]


See other pages where Organotransition metal chemistry, alkyne is mentioned: [Pg.99]    [Pg.326]   
See also in sourсe #XX -- [ Pg.99 ]




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