Konfigurations- und konformationsisomere paratrope, rotationsdynamische Tetraepoxy[32]annulene(6.2.6.2) und diatrope Tetraoxa[30]porphyrin(6.2.6.2)-Dikationen: Nachweis eines Tetraepoxy[31]annulen(6.2.6.2)-Radikalkations
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
‘Oligomere' Kondensationsprodukte von (1E,3E,5E)-1,6-Di(2-furyl)hexa-1,3,5-trien mit Acetaldehyd: Tetrahydro-tetramethyl-octaepoxy[60]annulen(6.1.6.1.6.1.6.1)
作者:Gottfried Märkl、Robert Ehrl、Peter Kreitmeier
DOI:10.1002/hlca.200390076
日期:2003.3
Oligomeric Condensation Products of (1E,3E,5E)-1,6-Di(2-furyl)hexa-1,3,5-triene with Acetaldehyde: Tetrahydro-tetramethyl-octaepoxy[60]annulene(6.1.6.1.6.1.6.1)