A method for the synthesis of a new phosphine-free [N,N,O]-tridentate Schiff base ligand L1 using the 2-Ferrocenyl-2-thiazoline as scaffold was developed. The 1,2-disubstituted ferrocene-based ligand was assembled using as key strategy the directed ortho-metalation (DoM) in 2-ferrocenyl-2-thiazoline. L1 was successfully obtained in 83% of overall yield after two-step synthesis. The coordination ability of L1 towards Ru(II) was evidenced and the resulting complex was characterized by IR, UV-vis and EPR. Its catalytic performance was tested in transfer hydrogenation of a variety of substrates giving moderate to excellent conversions.

中文翻译：

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基于[N，N，O]三齿-2-铁茂铁-2-噻唑啉配体的钌配合物催化转移加氢

开发了一种以2-二茂铁基-2-噻唑啉为骨架合成无膦的[N，N，O]-三齿席夫碱配体L1的新方法。使用2-铁茂铁基-2-噻唑啉中的定向邻位金属化（D o M）作为关键策略组装1,2-二取代的二茂铁基配体。两步合成后，L1以总收率的83％成功获得。证明了L1对Ru（II）的配位能力，并通过IR，UV-vis和EPR表征了所得的配合物。在各种底物的转移加氢中测试了其催化性能，得到了中等至优异的转化率。