|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|1328222||977549||2007||6 صفحه PDF||سفارش دهید||دانلود رایگان|
Formal [3+2] cycloaddition reactions between the bis-sulfonium zirconocene-ate dimer 1a and methylpropiolate, benzaldehyde and carbon disulfide afforded stable zwitterionic phosphonium zirconocene-ate complexes 2–4, respectively, with two orthocondensed five-membered heterocycles. X-ray crystal structure of 4 has been determined. Elemental chalcogens (S, Se, Te) gave rise also to a new variety of five-coordinate zirconium(IV) complexes (5–7) by a formal [3+1] cycloaddition reaction. In these bicyclic zirconates, sulfur is included in a five-membered ring while the second chalcogen is in a four-membered one.
A new class of stable zwitterionic phosphonium anionic zirconocene complexes containing at least one group 16 atom directly bonded to zirconium was prepared from reactions of a bis-sulfonium zirconocene-ate dimer with methylpropiolate, benzaldehyde, carbon disulfide and more simply with elemental sulfur and heavier chalcogens.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 692, Issue 21, 1 October 2007, Pages 4669–4674