On the chemistry of pyrrole pigments, XC: Pyridinologous linear tri- and tetrapyrroles
摘要:
One pyridinologous linear tripyrrole and two pyridinologous linear tetrapyrroles were prepared, and their structural aspects derived from spectroscopic measurements and force field calculations. The properties of these novel pyrrole pigments are compared with those of analogous linear tri- and tetrapyrroles.
In this work, the synthesis and reactivity of seven-membered palladacycles are described, and a novel bi-pyridines synthesis in a catalytic pathway is reported. Neophylpalladacycle (I) reacts with an excess of 2-Br-pyridine, giving the desired new binuclear seven-membered palladacycle (1) and unexpectedly, a bipyridine complex [Pd(BiPy)Br2]. ESI-HRMS experiments show that fragmentation into the Pd-Br
Syntheses employing pyridyllithium reagents: new routes to 2,6-disubstituted pyridines and 6,6′-disubstituted 2,2′-bipyridyls
作者:J.E. Parks、B.E. Wagner、R.H. Holm
DOI:10.1016/s0022-328x(00)89953-2
日期:1973.8
New 2,6-disubstituted pyridine derivatives have been synthesized employing 6-bromo-2-lithiopyridine as an intermediate. Subsequent replacement of the 6-bromine can be effected by metal-halogen exchange or other reactions in some cases. Reactions of the previously unreported 6-lithio-2,2′-bipyridyl and 6,6′-dilithio-2,2′-bipyridyl are described. Cupric chloride was found to be an effective coupling