Heteroleptic compounds containing phenylpyridine and phenylbenzimidazole are provided. The compounds may be used in organic light emitting devices, particularly as emissive dopants in the emissive layer of such devices.
Synthesis of Dihydropyridines and Pyridines from Imines and Alkynes via C−H Activation
作者:Denise A. Colby、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/ja7104784
日期:2008.3.1
A convenient one-pot C-H alkenylation/electrocyclization/aromatization sequence has been developed for the synthesis of highly substituted pyridine derivatives from alkynes and alpha,beta-unsaturated N-benzyl aldimines and ketimines that proceeds through dihydropyridine intermediates. A new class of ligands for C-H activation was developed, providing broader scope for the alkenylation step than could be achieved with previously reported ligands. Substantial information was obtained about the mechanism of the reaction. This included the isolation of a C-H activated complex and its structure determination by X-ray analysis; in addition, kinetic simulations using the Copasi software were employed to determine rate constants for this transformation, implicating facile C-H oxidative addition and slow reductive elimination steps.
Nehl, Hans, Chemische Berichte, 1994, vol. 127, # 12, p. 2535 - 2538
作者:Nehl, Hans
DOI:——
日期:——
(Co)cyclodimerization of alkynes by aluminum halides. Synthesis of pyridines from aluminum halide .sigma. complexes of cyclobutadienes and nitriles