Copper-zinc organometallic

The addidon-eliminadon reacdon of copper-zinc organometallics RCuCCNiZnX with (Ey Tnitro-2-phenylsulfonylethylene gives highly funcdonalized CEl-nitroalkenes in excellent... 

The addition-elimination reaction of copper-zinc organometallics RCu(CN)ZnX with ( )-l-nitro-2-phenylsulfonylethylene gives highly functionahzed (E)-nitroalkenes in excellent yields.129... 

S)- (113162-02-0), 70, 47 (E)-Clnnamaldehyde, 70, 197, 240 Citric acid, 70, 54 CONJUGATED ENYNES, 70, 215 Copper(l) bromide-dimethyl sulfide complex, 70, 218 Copper cyanide (544-92-3), 70, 196 Copper(l) thiophenoxide, 70, 206 Copper-zinc organometallic, 70, 196 Crown ethers, chiral, 70, 65... 

In one recent synthesis, 91 was prepared using a photoreductive cyclization of a N,N-unsaturated dialkyl-2-oxocyclopentanecarboxamide [274]. In another synthesis of 91, a mixed copper, zinc organometallic reagent was added to a 2,5-disubstituted V-acylpyridinium salt to... 

The addition of copper-zinc organometallics to imines is sluggish. However, benzylic zinc halides possess sufficient reactivity and add directly to in situ generated imines. The secondary amine 514 was obtained from the benzylic zinc reagent 515 in 60% yield and 70% de (Scheme 2-148). ... 

As well as alkenylstannanes [106-108], other classes such as a-heteroatom-substituted alkyltributylstannanes [109] and, more importantly, allylic stannanes [110, 111] also undergo these Sn-Cu transmetalations. Otherwise difficult to prepare, allylic copper reagents may, however, be obtained by treatment of allylic stannanes (produced in turn from organolithium, magnesium, or zinc organometallics) with Me2CuLi LiCN. They enter into cross-coupling reactions with alkyl bromides [110] or vinyl triflates (Scheme 2.52) [111]. 

The moderate intrinsic reactivity of zinc organometallics can be increased by transmetalation with various transition metal salts. Especially useful is the transmetalation of diorganozincs or organozinc halides with the THF-soluble complex of copper(I) cyanide... 

Copper-zinc reagents, in asymmetric addition reactions, 9, 110 Core-functionalized dendrimers as catalyst hosts, 12, 803 as organometallic hosts, 12, 800 Core-valence ionization correlations, and photoelectron spectroscopy, 1, 394... 

Ziegeler-Natta conditions 304 zig zag chromophores 217 zinc-copper exchange 275 zinc-copper organometallics 397 zinc-copper reagents 396, 397 reactions with acid chlorides 398 zinc-copper species RCu(CN)ZnX 394 zinc enolates 20 zinc metal, activated 291 zinc organometallics 278, 389 zinc salts 9... 

Transmetallation of zinc organometallics with manganese(II) salts does not occur and cannot be used to produce functionalized organomanganese compounds. The reaction of unsaturated alkyl bromides furnishes, in the presence of a mixed metal-salt system composed of copper(I) chloride and manganese(Il) bromide [32], cyclization products in satisfactory yields (see Section 9.6.17 Scheme 9-55) [94]. 

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