作者:Birte Haberlag、Matthias Freytag、Constantin G. Daniliuc、Peter G. Jones、Matthias Tamm
DOI:10.1002/anie.201207772
日期:2012.12.21
Now even terminal: The 2,4,6‐trimethylbenzylidyne complexes [MesCMOC(CF3)2Me}3] (M=Mo, W) were synthesized from [Mo(CO)6] and [W(CO)6], respectively. The molybdenum complex is an efficient catalyst for the metathesis of internal and terminalalkynes and also for the ring‐closing metathesis of internal and terminal α,ω‐diynes at room temperature and low catalyst concentrations.
Preparation of Imidazolin-2-iminato Molybdenum and Tungsten Benzylidyne Complexes: A New Pathway to Highly Active Alkyne Metathesis Catalysts
作者:Birte Haberlag、Xian Wu、Kai Brandhorst、Jörg Grunenberg、Constantin G. Daniliuc、Peter G. Jones、Matthias Tamm
DOI:10.1002/chem.201000597
日期:2010.8.2
excess of 3‐hexyne. Complexes 3 a and 3 b are able to efficiently catalyse alkyne cross metathesis of various 3‐pentynyl benzyl ethers5 and benzoic esters 7 at room temperature, to afford 2‐butyne and the corresponding diethers 6 and diesters 8. The tungsten complex 3 a proved to be a superior catalyst for ring‐closing alkyne metathesis, and the [10]cyclophanes 10 and 12 were synthesised in high yield
的反应〔PhCMBr 3(DME)](DME = 1,2-二甲氧基乙烷)与六氟叔丁醇盐的LiX或KX [X = OC(CF 3)2本人]得到benzylidyne配合物[PhCMX 3(dme)](2 a:M = W,2 b:M = Mo),它进一步与锂试剂Li(Im t Bu N)反应,该试剂由MeLi由1,3-二叔丁基咪唑啉-生成-2-亚胺(IM吨卜NH),以形成咪唑啉-2- iminato配合物[PhCMX 2(IM吨卜N)](3:M = W,3b中:M =钼)。丙炔复合物[EtCMoX2(NIm t Bu)](4)通过用过量的3-己炔处理3 b得到。配合物3a和3b能够在室温下有效催化各种3-戊炔基苄基醚5和苯甲酸酯7的炔烃交叉复分解反应,得到2-丁炔和相应的二醚6和二酯8。钨配合物3a被证明是闭环炔烃复分解的优良催化剂,[10]环烷10和12是由1,3-双(3-戊炔氧基甲