Nickel dichloride

In the presence of bis(lriphenylphosphane)nickel dichloride both tram-1 and m-1 react with methylmagnesium bromide affording cis-2, trans-2 and 3 in a 19 1 5 ratio72c. It should be noted that the methyl group is introduced at the sterically more hindered carbon and this... 

Li3(BN2) have already demonstrated the decomposition of (BN2) ions into boron nitride. The remaining nitride can lead to the formation of a binary metal nitride or reduce the transition metal ion under the formation of N2. Both mechanisms have been obtained experimentally, depending on the stability of the metal nitride. For instance niobium pentachloride forms NbN, titanium trichloride forms TiN, and nickel dichloride forms Ni, plus BN and nitrogen, respectively, in reactions with Li3(BN)2 (at 300-600°C) [24]. 

Dialkylindolines and 1,3-dialkylindoles are formed in poor yield (<10%) from the reaction of ethyl- or phenymagnesium bromide with 2-chloro-N-methyl-N-allylaniline in the presence of catalytic quantities of (bistriphenylphosphine)nickel dichloride.72 In a modification of this procedure, the allyl derivatives can be converted by stoichiometric amounts of tetrakis(triphenylphosphine)nickel into 1,3-dialkylindoles in moderate yield72 (Scheme 43) an initial process of oxidative addition and ensuing cyclization of arylnickel intermediates is thought to occur. In contrast to the nickel system,72 it has proved possible to achieve the indole synthesis by means of catalytic quantities of palladium acetate.73 It is preferable to use... 

A nickel-chromium catalyst prepared from chromous chloride and (p-diphenylphos-phinopolystyrene)nickel dichloride mediates the ring-closure of the ene-allene 236 (R = H) to a mixture of 3.4 parts of 237 and 1 part of 238 (equation 120)121. An analogous reaction of the t-butyldimethylsilyl ether of 236 yields solely the (E)-isomer 237 (R = t-BuMeaSi). Cyclization of the ene-allene 239 affords the perhydroindane 240 in 72%... 

Ikeda and coworkers351 performed [2 + 2 + 2] cycloadditions of diynes with a,ji-enones using NiCl2/Zn (1 10) as the catalytic couple. In these reactions, nickel dichloride... 

There are no examples of nucleophilic substitution of hydrogen on thianthrene. Methylmagnesium iodide, in the presence of [1,3-bis (diphenylphosphino)-propyl]nickel dichloride caused ring opening, probably initially via 48 o-xylene, from a second organometallic attack, and, by... 

Nickel(II) chloride nickel dichloride nickelous chloride... 

A nickel-catalysed electro-Reformatsky reaction has been previously presented (Section . . , Figure 5)57. Based on a formally related catalytic cycle, a nickel-catalysed 3-component route to /J-arnino esters and amides has been proposed (equation 41). To a CH2CI2 solution of an aldehyde and an aromatic amine are successively added dimethylz-inc, methyl bromoacetate (la) and bistriphenylphosphine nickel dichloride. After 1-3 h at rt, products were isolated in very high yield, and this procedure was exploited for the preparation of a chemical library of 64 members, using 4 aldehydes, 4 cr-haloesters and 4 substituted anilines58. 

A 500-ml reaction flask was charged with the step 1 product (43.1 mmol), the poly condensate of 4,4 -dichlorobenzophenone-2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexa-fluoropropane (Mn 11,200 Da 1.80 mmol), bis(triphenylphosphine) nickel dichloride (1.35 mmol), sodium iodide (5.85 mmol), triphenylphosphine (18 mmol), and zinc (108 mmol). The mixture was dried under vacuum and then treated with 87 ml of N,N-dimethylacetamide and kept in the temperature range of 70-90°C. After 3 hours the mixture was diluted with 200 ml of V,V-dimethylacetamide and insoluble components removed by filtration. The filtrate was then added to 1.5 liters of methanol containing 10 vol% concentrated hydrochloric acid to precipitate the polymer. After collecting, the precipitate was dried to obtain 28.5 g of product having polyhydroxyl groups. 

The nickel catalyzed reaction of 9 with an allyl chloride also proceeds in an Sn2 manner Eq. (42). Nickel dichloride complexed with a bidentate ligand (e.g. l,2-bis(diphenylphosphino)ethane) effects a highly selective (>99%) SN2 reaction with cinnamyl chloride [29]. 

Another example has been found in the author s laboratory. In the course of studies on the synthesis of metal-olefin complexes by means of cathodic reduction in dry organic mediums, a variety of linear oligomers were prepared on the nickel atom formed at the platinum cathode in electrolytic solution (32). The solution contained tetracispyridine nickel perchlorate or nickel dichloride and butadiene in ethanol or dimethoxye-thane, using tetrabutylammonium perchlorate as an electrolyte. 

The reaction of Grignard reagents with thiophene and benzo[6]thiophene in presence of bis(triphenylphosphine)nickel dichloride catalyst results in ring opening with replacement of C—S bonds by C—C bonds (Scheme 38) (79CC637). Thus phenylmagnesium bromide gives 1,4-diphenylbutadiene and phenylstilbene respectively as a 1 1 mixture of stereoisomers. 

Diaryliodonium salts 98 react with aldehydes 99 in the presence of chromium dichloride and nickel dichloride with the formation of benzyl alcohols 100 (Scheme 44) [74]. The mechanism of this reaction involves the generation of organochromium(III) species via reaction of iodonium salts with chromium dichloride, followed by their nucleophilic addition to aldehydes to yield alcohols. 

Analogous high-yield cyclizations were reported with l-amino-2-nitro-derivatives of pyridines and isoquinolines, which gave the corresponding furoxans [53,54], Anilines oxidized in the presence of indoles afforded Schiff s bases from 2- and/or 3-position in low yield [55], An unexpected rearrangement occurred on treatment of l-phenyl-4-methyl-5-aminopyrimidinone with DIB and catalytic amounts of nickel dichloride, resulting in the formation of an imidazole derivative [56] ... 

Dichlorobis(tricyclohexylphosphine)nickel is first prepared by the following procedure, which is a slight modification of the original synthesis of Turco, Scatturin, and Giacometti.7 A solution of tricyclohexylphosphine (14.0 g, 0.050 mol) in benzene (50 mL) and ethanol (300 mL) is added slowly to a solution of nickel dichloride hexahydrate (5.9 g, 0.025 mol) in ethanol (100 mL) at room temperature in a nitrogen or an argon atmosphere. A reddish, crystalline precipitate deposits immediately. After the addition is complete, the mixture is left for a few hours, then the product is filtered off, washed with ethanol, and dried in vacuo. (Yield 16.4 g 95%.)... 

This compound can be prepared similarly to tri-/i3-allylchro-mium in 80% yield starting from anhydrous nickel dichloride. However, owing to the volatility of di-/i3-allylnickel, which codistills with ether very readily, the solvent is best removed at —78° and a pressure of 10-2 mm. Hg. The product can be obtained as pale yellow crystals from pentane. 

The electrodeposition of nickel, Ni, has been studied in acidic ionic liquids [37, 38, 45 8]. A divalent nickel species, Ni(ll), can be introduced into the ionic liquids by dissolving nickel dichloride, NiCla, or the anodic dissolution of Ni metal. The reduction of Ni(ll) occurs at around 0.38 V, producing metallic nickel in the acidic EMICI-AICI3 ionic liquid [47]. The formal potential of Ni(ll)/Ni in an acidic BPCI-AICI3 ionic liquid is reported as 0.800 V on the mole fraction scale [46], The electrodeposition of Al-Ni alloys occurs at the potential more negative than the... 

Bis(tnphenylphosphine)nickel dichloride H6 Soronmethyl sulfide 52 Boron tnllate 113... 

Chemical Abstracts Service Registry Number CAS 7718-54-9 (Previously CAS 37211-05-5) Synonyms Nickel dichloride Nickelous chloride Chemical/Pharmaceutical/Other Class Metal salt... 

The Phillips dimerization process [4,5] catalytically converts ethylene to butene-1 utilizing a nickel based catalyst system consisting of ethyl aluminium dichloride and bis(tri-n-butyl phosphine) nickel dichloride prepared in dry n-pentane. The process consists of three steps, a reaction step and two quench steps. In the reactor section, ethylene is fed to the reactor where it comes in contact with a mixture of diluent butenes and the two catalyst... 

Crystalline nickel dichloride (NiCb methanol or ethanol. 

By converting cyclopropyllithium intermediates to cyclopropylmagnesium bromide species and subsequent addition of approximately 1% of a nickel catalyst, [l,2-bis(diphenylphosphino)-ethane]nickel dichloride [Ni(dppe)Cl2], the tricyclo[4.1.0.0 ]hept-l-yl and similar anions were... 

To a solution of the azide (617 mg, 1.43 mmol) in methanol/THF (30 mL, 3 1) at 0 °C was added nickel dichloride hexahydrate (542 mg, 2.28 nunol) followed by sodium borohydride (248 mg, 6.57 mmol) over 10 min. After 30 min, the black mixture was allowed to warm to 25 °C, diluted with EtOAc (40 mL), and filtered through Celite. The solution was further diluted with EtOAc (50 mL) and washed with brine (2 x 25 mL) and 0.01 M EDTA solution (1 x 25 mL, pH 7.5, K-phosphate buffer). After solvent removal in vacuo, the resulting oil was purihed by silica gel chromatography (100% EtOAc then EtOAc methanol, 12 1) to give 569 mg (98%) of the amine. 

Anhydrous nickel dichloride (4 g, 31 mmol) is added to a 500 mL Schlenk tube equipped with a dropping funnel, and the system is filled with argon. EtjO (150 mL) is... 

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