M-alkenyl

Finally, intramolecular hydroamination/cyclisation of M-alkenyl ureas was catalysed by the well-defined [AuCl(IPr)] complex (Schane 2.16), in the presence of AgOTf (5 mol%, rt, methanol, 22 h). The cationic Au(lPr)+ is presumably the active species [83]. 

Resorcinols. RhCl, 3H,() catalyzes isomerization of m-alkenyl-1,3-cyclohexa-ncdionc derivatives to resorcinols.1... 

B-alkenylcatecholboranes with bromine in the presence of base leads to inversion of configuration to give alkenyl bromides (Scheme 2)174). Thus, this method provides a convenient procedure to synthesize either trans-alkenyl iodides or m-alkenyl bromides. 

The stability of the c-metal IB-carbon bond follows the order alkyl-M < aryl-M alkenyl-M < alkynyl-M [M = Cu(I), Ag(I), Au(I)L]. However, for Cu(I) and Ag(I), most alkyl, aryl and alkenyl compounds are only stable at < 0°C Furthermore, the stable organogold(I) species, with a few exceptions, have the general formula RAu(I)L, in which L is a neutral two-electron donor ligand. 

R-X = alkenyl and atyl halides and triflates R M = alkenyl and aryl zinc, aluminum, zirconium, or boron and tin... 

The palladium-catalyzed domino assembly of norbornene (53), the m-alkenyl iodide 54, and a terminal alkyne or cyanide reported by Torii, Okumoto et al. [169], provides an... 

Componds such as (25) have been prepared in high yield by linking c/o.ro-C2Bio-clusters with nitroimidazoles the precursors are m-alkenyl and (U-alkynyl-2-nitroimidazoles and carbaborane nitrile oxide. The lipophilic nature some of the new conqtlexes has been noted. Aminoalkyl-derivatives of C/050-C2B10H12 have been reported. The functional groups allow the carbaboranes to be incorporated into structures that are of potential use in BNCT. A range of other functionalised carbaborane clusters have been prepared for example, the attachment of... 

An alcohol could initiate the ring-opening polymerization of lactones by lipase catalyst ( initiator method ). In the lipase CA-catalyzed polymerization of DDL using 2-hydroxyethyl methacrylate as initiator, the methacryloyl group was quantitatively introduced at the polymer terminal, yielding the methacryl-type polyester macromonomer [98]. This methodology was expanded to synthesis of m-alkenyl- and alkynyl-type macromonomers by using 5-hexen-l-ol and 5-hexyn-l-ol as initiator. 

In the early 1990s, Soga studied several bis(co-alkenyl)zinc compounds, such as bis(3-butenyl)zinc and bis(4-methyl-3-pentenyl)zinc, as CTAs in propylene polymerization in an attempt to prepare polypropylenes having a terminal alkylzinc group on one chain end and an alkenyl group on the other. As expected for a heterogeneous TiCb catalyst system with multiple active sites, the reaction forms a mixture of polymer structures with zinc groups both in the side chains and on the chain ends. In fact, bis(m-alkenyl)zinc serves three roles in the reaction as coinitiator, comonomer... 

B.m. Alkenyl-Aryl CoupUng with Disubstituted Alkenylmetals... 

These substrates could be also applied in the zirconocene-mediated cyclization reaction halogen-substituted dienes or enynes, dienes with aryloxy or alkoxy substituents at allylic position, m-alkenyl imine, to-alkynyl imine, or m-alkenyl carbamate. The presence of heteroatoms allows further yff-X elimination and thus leads to various useful transformations (Scheme 1.4) [20-24]. 

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