Synthesis and structure of highly polarised double-bond compounds derived from S-proline
作者:R.Alan Aitken、Karamat Ali、Noemı́ de Elena、Philip Lightfoot
DOI:10.1016/s0040-4039(00)01372-1
日期:2000.10
Reaction of the chiral iminium salt 3 with stabilised carbanions gives the compounds 4-9 containing a highly polarised double bond. The extent of this polarisation is determined by variable temperature H-1 NMR studies, comparison of C-13 NMR chemical shifts and an X-ray structure determination. (C) 2000 Elsevier Science Ltd. All rights reserved.
Diaminocarbene- and Fischer-Carbene Complexes of Palladium and Nickel by Oxidative Insertion: Preparation, Structure, and Catalytic Activity
作者:Doris Kremzow、Günter Seidel、Christian W. Lehmann、Alois Fürstner
DOI:10.1002/chem.200400928
日期:2005.3.4
is complementary to existing methodology in which the central metal does not change its oxidation state, and therefore allows to incorporate carbene fragments that are difficult to access otherwise. The preparation of a variety of achiral as well as enantiomerically pure, chiral metal-NHC complexes (NHC = N-heterocyclic carbene) and metal complexes with acyclic diaminocarbene ligands illustrates this