Silver-free activation of ligated gold(I) chlorides: the use of [Me3NB12Cl11]- as a weakly coordinating anion in homogeneous gold catalysis.
Phosphane and N-heterocyclic carbene ligated gold(I) chlorides can be effectively activated by Na[Me3NB12Cl11] (1) under silver-free conditions. This activation method with a weakly coordinating closo-dodecaborate anion was shown to be suitable for a large variety of reactions known to be catalyzed by homogeneous gold species, ranging from carbocyclizations to heterocyclizations. Additionally, the capability of 1 in a previously unknown conversion of 5-silyloxy-1,6-allenynes was demonstrated.
Organic Chemistry, Bergische Universität Wuppertal, Gaussstrasse 20, 42119 Wuppertal (Germany), Fax: (+49) 202-4392648.
Michael
M
Wegener
Florian
F
Huber
Christoph
C
Bolli
Carsten
C
Jenne
Stefan F
SF
Kirsch
borates; cyclization; gold; homogeneous catalysis; weakly coordinating anions