An efficient synthesis of heptaaryldipyrromethenes from tetraarylcyclopentadienones and ammonium acetate and their extension to the corresponding BODIPYs
Functionalized tetraarylphthalimides or diarylphthalimides fused with an acenaphthene moiety have been prepared in one step from 2-bromomaleimide and tetraarylcyclopentadienones (tetracyclones) or 7,9-diaryl-8H-cyclopentacenaphthylene-8-ones (acecyclones). The reaction, involving a cycloaddition-decarbonylation-dehydrobromination sequence, gives high isolated yields and is compatible with the presence of various functional groups.
Thermal oxidation of tetracyclones (2,3,4,5-tetraarylcyclopentadienones)
作者:Thies Thiemann、Jesus Iniesta、David J. Walton
DOI:10.3184/030823408x310792
日期:2008.3
Tetracyclones are transformed to a mixture of diacylstilbenes and α-pyrones, when they are heated in diphenylether saturated with oxygen.
当四旋风在氧饱和的二苯醚中加热时,它们会转化为二酰基二苯乙烯和 α-吡喃酮的混合物。
Highly Branched Dendrimers
申请人:Burn Paul Leslie
公开号:US20080211391A1
公开(公告)日:2008-09-04
A dendrimer of formula (I): [DENDRON
1
]
x
-CORE-[B-[X]
b
]
a
(I) wherein: CORE is a metal ion or a group containing a metal ion, or is a non-polymeric organic group; B is a phenyl ring; a is an integer of from 1 to 8; b is an integer of from 3 to 5; x is zero or an integer of from 1 to 7; each X is an aryl or heteroaryl ring, or is an at least partially conjugated dendritic molecular structure; each DENDRON
1
is an at least partially conjugated dendritic molecular structure; and wherein the dendrimer further comprises one or more surface groups; with the proviso that where CORE is a non-metallic core, then X is an at least partially conjugated dendritic molecular structure comprising at least one linking group.
the synthesis of polyphenylene dendrimers that are functionalized with up to 16 lysineresidues or substituted with short peptide sequences composed of 5 lysine or glutamicacid repeats and a C- or N-terminal cysteine residue. Polyphenylene dendrimers were prepared via a sequence of Diels–Alder cycloaddition and deprotection reactions from cyclopentadienone building blocks. Single amino acids could
Abstract We show the versatile synthesis of four tribenzopentaphene derivatives bearing alkyl side chains at three different positions. Substitutions on two of these positions led to subtle intensity changes at the lines of the blue emission, whereas alkylation in the bay region led to dimerization of the pentaphene derivative, resulting in a distortion of the chromophore geometry and an emission shift