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Abstract
AbstractThe N‐heterocyclic carbene palladium complex (SIPr)Pd(cinnamyl)Cl [SIPr=N,N′‐bis(2,4,6‐trimethylphenyl)‐4,5‐dihydroimidazol‐2‐ylidene) promotes regio‐ and stereospecific dimerization of a variety of arylalkynes to give (E)‐1,3‐enynes in good to excellent yields. An efficient and practical procedure for their synthesis was developed using a biphasic aqueous alkali/heptane system. Optical and electronic properties of (E)‐1,3‐enynes are highly tunable. Depending on the nature of the substituents, HOMO energies vary in the range 5.3–6.0 eV. (E)‐1,3‐Enynes can exhibit intense photoluminescence in the spectral region 350–500 nm.magnified image
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