Synthesis and transformations of metallacycles 36. Cycloalumination of macrocyclic diacetylenes with Et3Al catalyzed by Cp2ZrCl2
作者:V. A. D’yakonov、R. A. Tuktarova、T. V. Tyumkina、L. M. Khalilov、U. M. Dzhemilev
DOI:10.1007/s11172-010-0331-9
日期:2010.10
Cycloalumination of macrocyclic diynes with Et3Al catalyzed by Cp2ZrCl2 resulted in unsaturated bi- and tricyclic mono- and dialuminacarbocycles in 76–91% yields.
Synergetic Effects of Oxidative and Coordinative Promotors to Increase the Yield of a Twofold Pauson−Khand Reaction
作者:Rolf Gleiter、J. Hilko Schulte、Daniel B. Werz
DOI:10.1002/ejoc.200400290
日期:2004.10
Four medium-sizedcyclic diynes (7, 15−17), two cyclic dithiadiynes (18, 19) and two cyclic tetrathiadiynes (20, 21) were starting materials for Pauson−Khand reactions with ethylene and (octacarbonyl)dicobalt under four different conditions: A with 1 equivalent n-butylmethyl sulfide (BMS), B with 7.5 equivalents dimethyl sulfoxide (DMSO), C with 7.5 equivalents DMSO and 1 equivalent BMS and D with
An efficient one-pot method for the synthesis of mono- and biscyclopentenones via zirconium-catalyzed cycloalumination of cyclic alkynes and diynes
作者:Vladimir A. D’yakonov、Regina A. Tuktarova、Usein M. Dzhemilev
DOI:10.1016/j.tetlet.2010.08.120
日期:2010.11
Mono- and bisaluminacyclopentenes obtained via zirconium-catalyzed cycloalumination with Et3Al and cyclic alkynes or diynes can be converted into the corresponding mono- and biscyclopentenones by treatment with CO2, ClCOOEt, or CO(OEt)(2) in yields of 34-73%. (C) 2010 Elsevier Ltd. All rights reserved.
Twofold Pauson-Khand Reaction of Cyclic Diynes in Supercritical Ethylene
作者:Bernhard J. Rausch、Heike Becker、Rolf Gleiter、Frank Rominger
DOI:10.1055/s-2002-25348
日期:——
The cyclic diynes 1 and 7-11 were allowed to react in supercritical (sc) ethylene under Pauson-Khand conditions to give the tricyclic diketones 4 and 12-16 in yields between 47% and 15%, respectively. Our investigations reveal that in the case of cyclic diynes the yields of Pauson-Khand reactions in organic solvents can be tripled, by carrying out the syntheses in supercritical ethylene. The geometry of the resulting sulfur substituted diones 14 and 15 was determined by means of X-ray analysis on single crystals. Additionally, the synthesis of the twofold tethered cyclopentadienes 17 and 18 and the bis(tricarbonyl-manganese) complexes 19a and 19b from tricyclic dione 4 is presented.