Beiträge zur chemie organometallischer metallacyclischer nebengruppenmetallverbindungen

Fröhlich, Hans‐Otto; Kosan, Birgit; Undeutsch, B.; Görls, Helmar

doi:10.1016/0022-328x(94)80188-6

“…These spirocyclic zincates, each containing two five-membered metallacycles having methyl substituents at the various positions of the five-membered ring, were prepared from the corresponding 1,4-dilithio compounds and ZnCl 2 in diethyl ether. Some examples are shown in equation 5 in Scheme 1 50 . Similar compounds with other donor molecules at lithium, like DME, Pr 2 O and dioxane, were reported in the same paper.…”

Section: {[(Mementioning

confidence: 99%

Structural Organozinc Chemistry

Jastrzebski¹,

Boersma²,

Koten³

2006

The Chemistry of Organozinc Compounds

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“…For example, the molecular structure of the complex 4 -] 2 (R = H, Me; L = TMEDA, THF; x = 1, 2) have been prepared by treating ZnCl 2 with the corresponding dilithium compounds Li(CHR) 4 Li in diethyl ether. 208 These compounds were found to be thermally very stable. As shown in Figure 54 − , PF 6 − ) and to be sensitive to protic reagents.…”

Section: 233mentioning

confidence: 98%

“…With the exception of compounds containing zinc -zinc and zinc -nickel bonds such as the clusters (see Cluster) Cp 6 207 Li, 208 or Na have been structurally characterized (Figure 50). …”

Section: Figure 49 Intramolecular Coordination In Organozinc Transitimentioning

confidence: 99%

Zinc: Organometallic ChemistryBased in part on the article Zinc: Organometallic Chemistry by Gerard Parkin which appeared in theEncyclopedia of Inorganic Chemistry, First Edition.

Gr��vy¹

2005

Encyclopedia of Inorganic Chemistry

0

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Since the discovery of the first organozinc compounds by Sir Edward Frankland in 1849, the organometallic chemistry of zinc made remarkable advances and organozinc species have become essential tools for organic chemists. During the past decade, numerous new and modified procedures for the preparation of the title compounds have been published, rendering their synthesis easier, faster, and less expensive and giving higher yields. The coordination chemistry of organozinc derivatives has been subject of further interest and various intra‐ and intermolecular complexes with different donor ligands have been structurally characterized by X‐ray crystallography and spectroscopic methods. The accumulation of molecular structures, physicochemical studies, and computational calculations has led to a better understanding of the organozinc chemistry, and consequently to the design of new derivatives for specific applications. Even if the development of areas like the chemistry of organozinc anions and cations is still in its early stage, these compounds, which exhibit properties different than those of the parent organometallic species, appear to have promising applications in synthesis and catalytic reactions. During the past ten years, the chemistry of organo‐ gem ‐dizincio derivatives has also been the subject of much interest and progress. These reagents can form two carbon–carbon bonds in a one‐pot reaction and with high stereoselectivity. They became key reagents for organic chemists who want to combine multiple transformations in one operation. The importance of organometallic compounds of zinc can be seen in the growing number of their applications in synthesis. They are used in many reactions such as substitutions, additions to carbonyl compounds and unsaturated systems, cyclopropanations, and polymerizations. Furthermore, as a result of their low reactivity, they tolerate a wide variety of functionalities and perform most of the transformations with high regio‐ and enantioselectivity. After spending more than half a century in the shade of Grignard and organolithium reagents, organozinc reagents are becoming more and more important in modern chemistry.

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“…59 The crystal structure of Me 2 N(CH 2 ) 3 ZnW(Cp)(CO) 3 , determined by X-ray crystallography, shows a tricoordinate zinc atom with a zinc -tungsten bond distance of 2.685Å. ), only few zincate derivatives (see Section 4.1) containing weak contacts between zinc and different metals such as Ba, 207 Li, 208 or Na have been structurally characterized ( Figure 50). …”

Section: Alkylzinc Compounds Containing a Zinc-metal Bondmentioning

confidence: 99%

“…For example, the molecular structure of the complex 4 -] 2 (R = H, Me; L = TMEDA, THF; x = 1, 2) have been prepared by treating ZnCl 2 with the corresponding dilithium compounds Li(CHR) 4 Li in diethyl ether. 208 These compounds were found to be thermally very stable. As shown in Figure 54, the structure of [Li(TMEDA)] 2 Zn[(CH 2 ) 4 ] 2 determined by X-ray crystallography, contains a central ZnC 4 core with distorted tetrahedral geometry, which is connected to each of the two Li·TMEDA rests via two bridging carbon atoms.…”

Section: Structurementioning

confidence: 99%

Zinc: Organometallic ChemistryBased in part on the article Zinc: Organometallic Chemistry by Gerard Parkin which appeared in theEncyclopedia of Inorganic Chemistry, First Edition.

Grévy

¹

2005

Encyclopedia of Inorganic and Bioinorganic Chemistry

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Since the discovery of the first organozinc compounds by Sir Edward Frankland in 1849, the organometallic chemistry of zinc made remarkable advances and organozinc species have become essential tools for organic chemists. During the past decade, numerous new and modified procedures for the preparation of the title compounds have been published, rendering their synthesis easier, faster, and less expensive and giving higher yields. The coordination chemistry of organozinc derivatives has been subject of further interest and various intra‐ and intermolecular complexes with different donor ligands have been structurally characterized by X‐ray crystallography and spectroscopic methods. The accumulation of molecular structures, physicochemical studies, and computational calculations has led to a better understanding of the organozinc chemistry, and consequently to the design of new derivatives for specific applications. Even if the development of areas like the chemistry of organozinc anions and cations is still in its early stage, these compounds, which exhibit properties different than those of the parent organometallic species, appear to have promising applications in synthesis and catalytic reactions. During the past ten years, the chemistry of organo‐ gem ‐dizincio derivatives has also been the subject of much interest and progress. These reagents can form two carbon–carbon bonds in a one‐pot reaction and with high stereoselectivity. They became key reagents for organic chemists who want to combine multiple transformations in one operation. The importance of organometallic compounds of zinc can be seen in the growing number of their applications in synthesis. They are used in many reactions such as substitutions, additions to carbonyl compounds and unsaturated systems, cyclopropanations, and polymerizations. Furthermore, as a result of their low reactivity, they tolerate a wide variety of functionalities and perform most of the transformations with high regio‐ and enantioselectivity. After spending more than half a century in the shade of Grignard and organolithium reagents, organozinc reagents are becoming more and more important in modern chemistry.

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Beiträge zur chemie organometallischer metallacyclischer nebengruppenmetallverbindungen

Cited by 31 publications

References 25 publications

Structural Organozinc Chemistry

Structural Organozinc Chemistry

Zinc: Organometallic ChemistryBased in part on the article Zinc: Organometallic Chemistry by Gerard Parkin which appeared in theEncyclopedia of Inorganic Chemistry, First Edition.

Zinc: Organometallic ChemistryBased in part on the article Zinc: Organometallic Chemistry by Gerard Parkin which appeared in theEncyclopedia of Inorganic Chemistry, First Edition.

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