electrophiles via Ar–C(O) cleavage remains a challenging yet highly desirable transformation in Sonogashira-type coupling. Herein, we report a palladium-catalyzed ligand-promoted alkynylation of unstrained aryl ketones. The protocol allows the alkynylation to be carried out in a one-pot procedure with broad functional-group tolerance and substrate scope. The potential applications of this protocol
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.
properties of these complexes were studied. The hydrophilic nido‐o‐carborane‐based iridium(III) complex VII showed the highest phosphorescence efficiency (abs. =0.48) among known water‐soluble homoleptic cyclometalatediridium(III) complexes and long emission lifetime (τ=1.24 μs) in aqueous solution. Both of them are sensitive to O2, and thus endocellular hypoxia imaging of complex VII was realized by
[EN] A dendrimer of formula (I): [DENDRON1]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 DENDRON1 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. [FR] L'invention porte sur un dendrimères de formule (I): [DENDRON1]x-CORE-[B-[X]b]a dans laquelle: CORE est un ion métal ou un groupe contenant un ion métal ou un groupe organique non polymère; B est un cycle phényle; a est un entier de 1 à 8; b est un entier de 3 à 5; x est nul ou un entier de 1 à 7; chaque X est un cycle aryle ou hétéroaryle ou une structure moléculaire dendritique au moins partiellement conjugée; chaque DENDRON1 est une structure moléculaire dendritique au moins partiellement conjuguée. Le dendrimère comporte en outre un ou des groupes de surface sous réserve que si CORE est un noyau non métallique, X soit une structure moléculaire dendritique au moins partiellement conjugée comportant au moins un groupe de liaison.