Alkynylmetal complex

Simple diastereoselectivity in intermolecular reactions, such as the addition of allenyl- or alkynylmetal complexes to aldehydes and ketones90 91, has remained until recently virtually unexplored92-94. 

Houbrechts, S., Wada, T., Sasabe, H., Morrall, J.P.L., Whittall, LR., McDonagh, A.M., Humphrey, M.G., Persoons, A. Novel organomctals for nonlinear optics octupolar alkynylmetal complexes. Mol. Cryst. Liq. Cryst. Science Tech.. Sect. B Nonlinear Opt. 22, 165-168 (1999)... 

Scheme 8.74, path B is reminiscent of the electrophilic attack at oxygen of acylmetal complex shown in Eq. 8.5. Another electrophilic route to carbene complex is the reaction of alkylmetals with Ph3C" , as shown in Eq. 8.25 [136]. An electrophilic attack that is similar to Scheme 8.74, path B but appears potentially more signihcant in catalysis is that of alkynylmetal complex to generate vinyli-dene ligand. Although Scheme 8.17 described direct formation of the vinylidene complex from M+ and terminal alkyne, this complex is sometimes derived by treatment of M-C = CR with H+ via -attack [137]. 

These polymers are synthesized in ways similar to the preparation of alkynylpalladium complexes from Pd(II) species and alkynylmetals, such as alkynyltins and alkynylcoppers (Scheme Concentrated solutions of these polymers have been found to form ly-... 

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