Efficient catalytic alkyne metathesis with a fluoroalkoxy-supported ditungsten(III) complex

Beilstein Journal of Organic Chemistry

Janin Schlösser¹  Henrike Ehrhorn¹  Matthias Tamm¹  Dirk Bockfeld¹ 

[1] Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany;

关键词: alkylidyne complexes;    alkyne metathesis;    catalysis;    terminal alkynes;    tungsten;   

DOI  :  10.3762/bjoc.14.220

来源: DOAJ

【 摘 要 】

The molybdenum and tungsten complexes M2(OR)6 (Mo2F6, M = Mo, R = C(CF3)2Me; W2F3, M = W, R = OC(CF3)Me2) were synthesized as bimetallic congeners of the highly active alkyne metathesis catalysts [MesC≡M{OC(CF3)nMe3−n}] (MoF6, M = Mo, n = 2; WF3, M = W, n = 1; Mes = 2,4,6-trimethylphenyl). The corresponding benzylidyne complex [PhC≡W{OC(CF3)Me2}] (WPhF3) was prepared by cleaving the W≡W bond in W2F3 with 1-phenyl-1-propyne. The catalytic alkyne metathesis activity of these metal complexes was determined in the self-metathesis, ring-closing alkyne metathesis and cross-metathesis of internal and terminal alkynes, revealing an almost equally high metathesis activity for the bimetallic tungsten complex W2F3 and the alkylidyne complex WPhF3. In contrast, Mo2F6 displayed no significant activity in alkyne metathesis.

【 授权许可】

Unknown