Practical and Convenient Synthesis of 1,6-Di- or 1,2,5,6-Tetra-arylhexa-1,3,5-trienes by the Dimerization of Pd(0)-Complexed Alkenylcarbenes Generated from π-Allylpalladium Intermediates
摘要:
Pd(0)-complexed 3-aryl or 2,3-diaryl propenylcarbenes generated from alpha-silyl-, alpha-germyl-, or alpha-boryl-alpha-allylpalladium intermediates undergo self-dimerization to provide 1,6-di or 1,2,5,6-tetraarylhexa-1,3,5-trienes in good to high yields. This method allows the use of a pi-allylpalladium intermediate for a carbenoid precursor. Furthermore, the obtained 1,2,5,6-tetraarylhexa-1,3,5-trienes exhibit aggregation-induced emission enhancement property.
1,6-Dibromohexa-1,3,5-triene − Stereocontrolled Synthesis of Monosubstituted and Disubstituted Hexatrienes by Palladium-Catalysed Cross-Coupling Reactions
a versatile precursor for the synthesis of conjugated 1,3,5-trienic derivatives of controlled configuration. In this paper, we describe the stereocontrolledsynthesis of E,E,Z, E,E,E and Z,E,Z isomers of α-bromo-ω-substituted-1,3,5-hexatrienes and 1,6-disubstituted-1,3,5-hexatrienes. The synthesis is based on palladium-catalysed single or double cross-couplingreactions between the three isomers − 1E
We investigated the structures and fluorescence properties for the crystals, powders, and thin films of the two positional isomers of dithienylpolyene, (E,E,E)-1,6-di(3-thienyl)hexa-1,3,5-triene (3T) and 1,6-di(2-thienyl)hexa-1,3,5-triene (2T). A combination of experimental single crystal X-ray and theoretical reduced density gradient (RDG)–atoms-in-molecules (AIM) analysis indicates the importance