33849-45-5Relevant academic research and scientific papers
Sulfur Ylide Complexes via Addition of Thioethers to Benzylidenepentacarbonyltungsten
Fischer, Helmut,Schmid, Johann,Zeuner, Siegfried
, p. 583 - 588 (2007/10/02)
Benzylidenepentacarbonyltungsten, (CO)5W (1), reacts with thioethers, SR2 (2), to give the sulfur ylide complexes (CO)5W (SR2 = SMe2 (3a), SEt2 (3b), SC4H8 (3c)).The thermolysis of 3a and 3b yields mainly (CO)5W(SR2) (4a,b), respectively.Additionally, cis-(CO)4W(SR2)2, 2 and W(CO)6 as well as cis- and trans-stilbene are formed.The complexes 3 react with PPh3, via SR2/PPh3 exchange to give (CO)5W.In the reaction of 3b with olefins such as 1-hexene and ethyl vinyl ether the C(H)Ph group is transferred to the olefinic double bond and cyclopropanes are formed.In contrast to the reaction of 1 with thioethers that with dimethyl sulfoxide does not yield a stable ylide complex but rather benzaldehyde via oxidative elimination of the benzylidene ligand.The (CO)5W fragment is stabilized as (CO)5W(SMe)2 (4a).
