1098071-09-0Relevant articles and documents
Facile iterative synthesis of biphenyl dendrons with a functionalized focus
Wren, Ellen J.,Wang, Xin,Farlow, Anthony,Lo, Shih-Chun,Burn, Paul L.,Meredith, Paul
supporting information; experimental part, p. 4338 - 4340 (2010/12/19)
Figure Presented. An iterative procedure gives 1,3,5-phenyl-linked dendrons of up to the fourth generation and enables the formation of different generations of iridium(III) complex-cored dendrimers. The convergent synthesis uses N,N′-1,8-napthyl-3,5-dibromophenylboronamide as the key building block. The iterative synthesis cycle involves deprotection of the boronamide-focused dendron to form a boronic acid and subsequent Suzuki coupling either with the N,N′-1,8-napthyl-3,5-dibromophenylboronamide to give the next dendron generation or with an activated core to form a dendrimer.
Flexible, bowl-shaped n-heterocyclic carbene ligands: Substrate specificity in indium-catalyzed ketone hydrosilylation
Chianese, Anthony R.,Mo, Allen,Datta, Dibyadeep
, p. 465 - 472 (2009/05/30)
A series of benzimidazolium chlorides was synthesized as precursors to N-heterocyclic carbene ligands, with N-substituents varying in size from 3,5-xylyl (la) to first-generation dendritic 3,5-bis(3,5-di-tert-butylphenyl) phenyl (lb), to the second-generation 3,5-bis[3,5-bis(3,5-di-terf-butylphenyl) phenyl]phenyl (1c). The dendritic side groups of lb and 1c form a flexible, bowl-like cavity. Iridium complexes of 1a-c were synthesized and were shown to be catalytically active for the hydrosilylation of aryl methyl ketones. The dendritic ligands lb and 1c effect a moderate level of substrate specificity in the competitive hydrosilylation of ketones of varying size. In the competitive hydrosilylation of acetophenone versus 3-(3,5-di-tert-butylphenyl)acetophenone, acetophenone is consumed approximately 3.7 times more quickly using the second-generation ligand 1c. Using the control ligand la, this ratio is 1.8.
