Ferrocenium hexafluorophosphate as an inexpensive, mild catalyst for the etherification of propargylic alcohols
作者:Matthew J. Queensen、Jordan M. Rabus、Eike B. Bauer
DOI:10.1016/j.molcata.2015.06.009
日期:2015.10
terminal, tertiary propargylic alcohols with primary and secondary alcohols (5 h to 3 days reaction time at 40 °C in CH2Cl2, 3 mol% catalyst loading). The propargylic ether products were isolated in 90–20% yields. The alcohols and propargylic alcohols were employed in an equimolar amount and no further additives were required. For a purely aromatic propargylic alcohol, the isolated yields were lower
Catalysis by β-Cyclodextrin Hydrate - Synthesis of 2,2-Disubstituted 2<i>H</i>
-Chromenes in Aqueous Medium
作者:Avishek Ghatak、Sagar Khan、Sanjay Bhar
DOI:10.1002/adsc.201500358
日期:2016.2.4
well as propargyl ethers with differently substituted phenols under ambient atmosphere in aqueous medium has been developed using β‐cyclodextrin hydrate as an efficient, recyclable and stable catalyst. This is the first report where β‐cyclodextrin hydrate acted as a catalyst for an organic transformation but β‐cyclodextrin alone failed.
Solvent free one pot syntheses of highly substituted propargyl ethers and propargyl amines from propargyl alcohols catalyzed by recyclable alumina-sulfuric acid
develop an efficient protocol for the solvent-free synthesis of a wide variety of highlysubstituted propargyl ethers and amines using alumina-sulfuric acid as a recyclable heterogeneous solid acidcatalyst has been presented. This mild protocol tolerates a good number of acid-sensitive moieties and can be applicable to a diverse range of alcohols and amines accommodating a variety of substitution patterns
The coordination chemistry and reactivity of amino-dithiaphospholanes with rhodium, iridium, and ruthenium
作者:Stephen Costin、Sergey L. Sedinkin、Eike B. Bauer
DOI:10.1016/j.tetlet.2008.12.034
日期:2009.2
Novel amino-dithiaphospholane complexes of ruthenium, iridium, and rhodium were synthesized, and their properties were studied. Reaction of the new amino-dithiaphospholane (RS)(2)PNR2' (R = binaphthyl, R' = CH2Ph, (rac)-4) with [RuCl2(P-cymene)](2) afforded [RuCl2(p-cymene)((rac)-4)] in 67% isolated yield. Similarly, the new amino-dithiaphospholanes (RS)(2)PNR2' (R = cyclohexyl, (rac)-7) and (RS)(2)PNR2' (R = phenyl, 9) gave upon reaction with [RhCl(CO)(2)](2) and [IrCp*Cl-2](2) the novel complexes [RhCl(CO)(L)(2)] and [IrCp*Cl-2(L)] (L = (rac)-7, 9) in 61-96% yields. The ruthenium complex is catalytically active for the etherification of propargylic alcohols with methanol and ethanol (8-48 h, 90 degrees C, 40-85% isolated yields). (C) 2008 Elsevier Ltd. All rights reserved.
Mamedov,S. et al., Journal of Organic Chemistry USSR (English Translation), 1967, vol. 3, p. 993 - 996