Selective reduction of alkynes to cis-alkenes by hydrometallation using [(Ph3P)CuH]6.
作者:John F. Daeuble、Colleen McGettigan、Jeffrey M. Stryker
DOI:10.1016/s0040-4039(00)97371-4
日期:1990.1
Selective reduction of alkynes to the corresponding alkenes is reported using the stable, readily prepared copper(I) hydride reagent, [(Ph3P)CuH]6. Terminal alkynes are reduced at room temperature, unactivated internal alkynes react only at elevated temperature. Disubstituted alkynes with propargyl activation are also reduced, giving cis-olefins selectively. Protection of propargylic alcohol functionality
3‐butadienes with various substitution patterns were formed in good to high yields in a copper‐catalyzed borylation of α‐alkoxy allenes with bis(pinacolato)diboron (see scheme; Bn=benzyl, pin=pinacolate, L is an N‐heterocyclic carbene ligand). The products were found to be useful intermediates for the synthesis of cyclic vinyl boranes, α,β‐unsaturated ketones, and functionalized multisubstituted dienes.
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
Synthesis, structural characterization and catalytic activity of indenyl complexes of ruthenium bearing fluorinated phosphine ligands
作者:Matthew J. Stark、Michael J. Shaw、Arghavan Fadamin、Nigam P. Rath、Eike B. Bauer
DOI:10.1016/j.jorganchem.2017.03.043
日期:2017.10
The synthesis, characterization and catalytic activity of new ruthenium complexes of fluorinated triarylphosphines is described. The new ruthenium complexes [RuCl(ind)(PPh3)P(p-C6H4CF3)3}] and [RuCl(ind)(PPh3)P(3,5-C6H3(CF3)2)3}] were synthesized in 57% and 24% isolated yield, respectively, by thermal ligand exchange of [RuCl(ind)(PPh3)2], where ind = indenyl ligand η5-C9H7−. The electronic and steric
描述了氟化三芳基膦新钌配合物的合成,表征和催化活性。新的钌络合物[RuCl(ind)(PPh 3)P(p -C 6 H 4 CF 3)3 }]和[RuCl(ind)(PPh 3)P(3,5-C 6 H 3( CF 3)2)3 }]在分别为57%和24%分离产率,合成,通过将[RuCl(IND)(PPH的热交换配位体3)2 ],其中的ind =茚基配位体η 5 -C 9 ħ 7 -。通过分析X射线结构和循环伏安法研究了新配合物的电子和空间特性。新的络合物[RuCl(ind)(PPh 3)P(p -C 6 H 4 CF 3)3 }]和[RuCl(ind)(PPh 3)P(3,5-C 6 H 3(CF 3)2)3 }]和已知的络合物[RuCl(ind)(PPh 3)2}]从键合长度和与钌中心相关的角度的比较中可以看出,它们的空间性质仅略有不同。通过循环伏安法测定,[RuCl(ind)(PPh
Etherification reactions of propargylic alcohols catalyzed by a cationic ruthenium allenylidene complex
作者:Doaa F. Alkhaleeli、Kevin J. Baum、Jordan M. Rabus、Eike B. Bauer
DOI:10.1016/j.catcom.2014.01.002
日期:2014.3
The cationic ruthenium allenylidene complex RRuRax −[Ru(indenyl)L(PPh3)CCCPh2]+PF6 catalyzes the etherification of secondary and tertiary propargylicalcohols in a formal nucleophilic substitution reaction utilizing primary and secondary alcohols as the nucleophiles. At a catalyst loading of only 1.1 mol%, the corresponding propargylic ether products were obtained in 9 to 73% isolated yields (18 h
阳离子钌亚烯基络合物R Ru R ax- [Ru(茚基)L(PPh 3)C C CPh 2 ] + PF 6在伯醇和仲醇作为亲核试剂的正式亲核取代反应中催化仲和叔炔丙醇的醚化反应。在仅1.1摩尔%的催化剂负载下,以9至73%的分离产率(在100℃下18小时反应时间)获得了相应的炔丙基醚产物;参见表1。无需其他添加剂。该反应表现出诱导期。如控制反应所示,高反应温度可以化学改变要用作催化剂的亚烯基络合物,但不会导致催化剂失活。