Download e-book for kindle: Aspects of Homogeneous Catalysis: A Series of Advances by Arno Behr (auth.), Renato Ugo (eds.)

By Arno Behr (auth.), Renato Ugo (eds.)

ISBN-10: 9400963637

ISBN-13: 9789400963634

ISBN-10: 9400963653

ISBN-13: 9789400963658

1. advent even though particularly dazzling effects were acquired within the previous couple of a long time within the box of homogeneous transition steel catalyzed alterations of olefins and alkynes [1], reactions that can bring about heterocycles were in part missed. An visible reason behind this is often that substrates containing heteroatoms similar to N, zero or S may possibly coordinate the steel and suppress the catalytic job. however, a few attention-grabbing early examples of transition-metal-catalyzed syntheses of heterocyclic compounds were said and those were reviewed through C. W. chicken [2] . extra lately the incorporation of CO , which permits esters and lactones 2 to be synthesized from olefinic beginning fabrics, has began to draw awareness (see, for instance, ref. [3]). The dominant function of palladium because the catalyst for the formation of O-containing heterocycles has been instructed to be linked to the fairly low energy of the Pd-O bond. one of the first examples of a nitrogen-containing heterocycle to be shaped by way of homogeneous catalysis is the triazine proven in Equation 1 that's the made from the trimerization of benzonitrile within the presence of iron penta carbonyl or Raney­ nickel [4] .

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Extra resources for Aspects of Homogeneous Catalysis: A Series of Advances

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2 ~ + CO + HY .. g. one which is generated in situ by [Pd(acac h] and PPh 3 , catalyzes the carboxy-telomerization of butadiene in ethanol to yield the ethyl nona-3,8-dienoate [163]. The ethoxyoctadienes are also formed in a side-reaction. The catalyst described is significantly inactive for the subsequent carbonylation of the ethoxyoctadienes which suggests that the nonadienoate is not produced by a following reaction of the ethoxyoctadienes. The absence of a halide ion which is coordinated to the palladium is an essential factor in carboxy·telomerizations [164, 165].

9) These facts suggest that there is a strong relationship between the reactivity and the basicity of the nucleophiles. This presumption was able to be confirmed [84] : the more basic amines show higher reactivity. 80) produced these products only in 19% and 29% yields respectively. Moberg and Akermark studied the reaction of butadiene with methylamine in the presence of catalytic amounts of Ni(codh, tributy1phosphine and boron trifluoride etherate [95]. They found that under these defined conditions the dioctadieny1arnines were obtained as main products.

SCHIFF BASES Palladium nitrate catalyzes the reaction of butadiene with Schiff bases in the presence of triphenylphosphine to produce the substituted piperidines 97. Palladium chloride or acetylacetonate were surprisingly ineffective in this reaction. This telomerization can be applied to Schiff bases which have aromatic substituents on the carbon atom and alkyl, allyl and aromatic substituents on the nitrogen atom. For example, the piperidine products 97 were able to be obtained in a total yield of 91 %withN-benzilidene-methyl-amine [159] .

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Aspects of Homogeneous Catalysis: A Series of Advances by Arno Behr (auth.), Renato Ugo (eds.)


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