Sterically driven synthesis of ruthenium and ruthenium–silver N-heterocyclic carbene complexes
作者:C. Cesari、S. Conti、S. Zacchini、V. Zanotti、M. C. Cassani、R. Mazzoni
DOI:10.1039/c4dt02747g
日期:——
A sterically driven synthetic route from non-bulky silver NHC to novel Ru(NHC) complexes and from bulky Ag(NHC) to unprecedented heterobimetallic Ru–Ag(NHC) complexes is presented.
Efficient catalytic reduction of ketones with formic acid and ruthenium complexes
作者:Naim Menashe、Einat Salant、Youval Shvo
DOI:10.1016/0022-328x(95)05995-2
日期:1996.5
ring-substituted derivatives were found to act as efficient catalysts in reduction reactions of aldehydes and ketones to alcohols, using formic acid as H source. Excess formic acid accelerates the reaction, and the corresponding formate esters were isolated as sole products. Turnover numbers of up to 8000 (alcohols) and 11 000 (formate esters) were attained, with yields in the order of 90%. Alkenes are not reactive
Functionalized tetraarylphthalimides or diarylphthalimides fused with an acenaphthene moiety have been prepared in one step from 2-bromomaleimide and tetraarylcyclopentadienones (tetracyclones) or 7,9-diaryl-8H-cyclopentacenaphthylene-8-ones (acecyclones). The reaction, involving a cycloaddition-decarbonylation-dehydrobromination sequence, gives high isolated yields and is compatible with the presence of various functional groups.
investigated in methanol. Di- and trisubstituted products were obtained as cyclopentenones, while tetraaryl-substituted systems were isolated as cyclopentadienones. The structures of the products were identified by elemental analysis, infrared (IR), nuclear magnetic resonance (1H NMR), and mass spectroscopy. The solid-state structure of 4-hydroxy-3,4-bis(4-methoxyphenyl)-5,5-dimethyl-2-cyclopenten-1-one
摘要钠-氢氧化钠催化的二-缩合p甲基和二- p -methoxybenzil用丙酮衍生物在甲醇中的影响。获得二取代和三取代的产物为环戊烯酮,而四芳基取代的系统被分离为环戊二烯酮。产品的结构通过元素分析,红外(IR),核磁共振(1 H NMR)和质谱鉴定。通过单晶X射线衍射分析进一步研究了4-羟基-3,4-双(4-甲氧基苯基)-5,5-二甲基-2-环戊烯-1-酮的固态结构。标题化合物在正交晶空间群中结晶,并且分子间的OH-··O和CHH···O氢键稳定晶格。 图形概要
Straightforward synthesis of iron cyclopentadienone N-heterocyclic carbene complexes
Novel iron complexes bearing both cyclopentadienone and N-heterocyclic carbene ancillary ligands were obtained by a straightforward synthesis from Fe2(CO)9. The preparation represents a rare example of silver transmetallation involving iron. The reaction is general and occurs in the presence of variously functionalized NHC and cyclopentadienones.