The application of manganese(II) complexes stabilized by a tridentate mono-anionic diamine ligand in various organic reactions
Conference
·
OSTI ID:250084
- Urecht Univ. (Netherlands); and others
The mono-anionic tridentate diamine ligand [C{sub 6}H{sub 3}(CH{sub 2}NMe{sub 2}){sub 2}-2,6]{sup -} (= NCN) is applied in the synthesis of a large variety of organometallic species including main group and transition group metals. Studies of these organometallic species have for example shown that a variety of coordination modes are possible for this ligand system and that these species can be used as catalysts in organic reactions. The authors recently set out to extend the range of NCN-metal complexes to those based on manganese(II) halides. It has been shown by Cahiez et al. that the use of organomanganese compounds in various organic reactions has a remarkable influence on both chemoselectivity and chemical yield. They have for example been used in C-C bond formation via alkylation reactions with alkyl halides, for acylation reactions and as catalysts in the 1,4-addition to {alpha},{beta}-unsaturated carbonyl compounds. However, it has not so far proved possible to perform these reactions enantioselectively. The authors now report results obtained with the new NCN-manganese(II) halide complexes in different organic reactions. For example, the alkylation reaction of an alkylbromide with a tertiary alkyl group, even in the presence of a ketone functionality, leads in almost quantitative yield to the C-C coupled product. The preliminary results obtained by using a chiral NCN-analogue and a chiral copper(I) co-catalyst are also presented.
- OSTI ID:
- 250084
- Report Number(s):
- CONF-9508100--
- Country of Publication:
- United States
- Language:
- English
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