Sodium cyclopentadienide, reaction with

Cyclopentadiene sandwich compounds are often prepared by reactions of metal halides with sodium cyclopentadienide, reaction (9). Dibenzene-... 

A standard method for prepanng sodium cyclopentadienide (CsHsNa) is by the reaction of cyclopentadiene with a solution of NaNH2 in liquid ammonia Write a net ionic equation for this reaction identify the acid and the base and use curved arrows to track the flow of electrons... 

TC-Cyclopentadienyl Nickel Complexes. Nickel bromide dimethoxyethane [29823-39-9] forms bis(cydopentadienyl)nickel [1271 -28-9] upon reaction with sodium cyclopentadienide (63). This complex, known as nickelocene, 7T-(C3H3)2Ni, is an emerald-green crystalline sandwich compound, mp 173°C, density 1.47 g/cm. It is paramagnetic and slowly oxidi2es in air. A number of derivatives of nickelocene are known, eg, methylnickelocene [1292-95-4], which is green and has mp 37°C, and bis( 7t-indenyl)nickel [52409-46-8], which is red, mp 150°C (87,88). 

Verdet and Stille1 employed brominated poly(phenylene oxide) intermediates in an effort to synthesize more stable catalyst supports containing (cyclopentadienyl)metal complexes. Treatment of poly(oxy-2,6-dimethyl-l,4-phenylene) with N-bromosuccinimide under photolytic conditions produced only the bromomethyl derivative if the D.F. did not exceed 0.35. Subsequent treatment of the bromomethylated polymer with sodium cyclopentadienide afforded the cyclopentadienyl functionalized polymer, 5, but the reaction was accompanied by crosslinking and it was not possible to remove the bromomethyl substituents quantitatively. 

Accompanies the Formation of Thiele s Ester via Reaction of Sodium Cyclopentadienide with Ethyl Chloroformate... 

Ruthenocene has been prepared in 20% yields by reaction of cyclopentadienylmagnesium bromide with ruthenium(III) acetyl-acetonate.8 More recently,4 the compound has been made in 43-52% yield by treatment of sodium cyclopentadienide with ruthenium trichloride in tetrahydrofuran or 1,2-dimethoxyethane. 

With a Grignard reagent, 1-methylquinolinium ions give products of type (284). A notable reaction of this class is that between the pyridine-sulfur trioxide complex and sodium cyclopentadienide (286)... 

Although 1,2,3,4,5-pentaisopropylcyclopentadiene can be prepared by successive isopropylations starting from sodium cyclopentadienide,61 the reaction of Na[C5(/-Pr)5] (12) with FeCl2 did not produce the desired decai-sopropylferrocene, but instead the unusually stable pentaisopropylcyclo-pentadienyl radical (13) [Eq. (6)].62 A direct synthesis of 13 from bromine... 

Tetrakis-cyclopentadienyl cerium (CeCp4) has been reported to be formed by the reaction of bis(pyridinium) hexachlorocerate with sodium cyclopentadienide [17]. Similarly indenyl and fluorenyl derivatives were prepared. Later work showed the same reactants in tetrahydrofurane to yield, Ce(Cp3), tricyclopentadienyl cerium complex instead of Ce(Cp4) [18]. 

LnCp3 complexes, where Ln = Sc, Y, La, Ce, Pr, Nd, Sm, Gd, Dy, Er, and Yb have been synthesized by the reaction of anhydrous metal chloride with sodium cyclopentadienide in tetrahydrofuran at room temperature [1],... 

The methods of preparation of ferrocene have been reviewed by Pauson and by Fischer. Ferrocene has been made by the reaction of ferric chloride with cyclopentadienyhnagnesium bromide, by the direct thermal reaction of cyclopentadiene with iron metal, by the direct interaction of cyclopentadiene with iron carbonyl, by the reaction of ferrous chloride with cyclopentadiene in the presence of organic bases such as diethyl-amine, by the reaction of ferrous chloride with sodium cyclopentadienide in liquid ammonia, and from cyclopentadiene and... 

Cleavage of a C —Cl and a C —O bond occurred on reaction of methyl tra i-3-(acetoxychlo-romethyl)-2,2-dimethylcyclopropanecarboxylate with sodium cyclopentadienide to give methyl tran.s-3-(cyclopenta-2,4-dienylidenemethyl)-2,2-dimethylcyclopropanecarboxylate. " Treatment of [cyclopropyl(phenylselanyl)methyl]triphenylphosphonium perchlorate with butyllithium followed by benzaldehyde resulted in cleavage of the C Se and the C-P bond and formation of a 1 1 mixture of ( /Z)-l-cyclopropyl-2-phenylethene in 76% yield.Re-... 

The complexes 3 and 5 were transformed into the mixed sandwich complexes 6 by reaction with thallium cyclopentadienide in benzene and with sodium cyclopentadienide in ethanol, respectively. The structure was determined by X-ray crystallography. ... 

The breakthrough came with the discovery that the nido anion C 2B<)1 In p (an icosahedral fragment prepared by removal of a BI P unit from ortho-carborane l,2-C2BioHi2, by means of its reaction with sodium methoxide in methanol) could coordinate strongly to transition metal cations in a manner similar to the cyclopentadienide anion, (11 (Scheme 3.7)11.40,198-202... 

---