Results 11 to 20 of about 938,190 (242)

Tandem ring‐opening–ring‐closing metathesis for functional metathesis catalysts [PDF]

Angewandte Chemie International Edition, 2016
Use of a tandem ring-opening–ring-closing metathesis (RORCM) strategy for the synthesis of functional metathesis catalysts is reported. Ring opening of 7-substituted norbornenes and subsequent ring-closing metathesis forming a thermodynamically stable
Aurelien Crochet, Kilbinger, Andreas F. M., Mohammad Yasir, Fromm, Katharina M., Andreas F. M. Kilbinger, Yasir, Mohammad, Amit A. Nagarkar, Nagarkar, Amit A., Crochet, Aurélien, Katharina M. Fromm, Andreas F.M. Kilbinger, Fromm KM, Nagarkar AA, Crochet A, Yasir M, Kilbinger AF   +15 more
core   +9 more sources

Halide exchanged Hoveyda-type complexes in olefin metathesis [PDF]

Beilstein Journal of Organic Chemistry, 2010
The aims of this contribution are to present a straightforward synthesis of 2nd generation Hoveyda-type olefin metathesis catalysts bearing bromo and iodo ligands, and to disclose the subtle influence of the different anionic co-ligands on the catalytic ...
Julia Wappel, César A. Urbina-Blanco, Mudassar Abbas, Jörg H. Albering, Robert Saf, Steven P. Nolan, Christian Slugovc   +6 more
doaj   +2 more sources

Ring-closing metathesis in carbohydrate annulation

Angewandte Chemie International Edition, 1998
Even eight-membered rings (such as in 2) can be formed by ring-closing metathesis of glucose derivatives such as 1.
Ghosh, Subrata, Russell, David R., Fawcett, John, Garratt, Shaun, Jenkins, Paul R., Barker, William D., Davies, David L., Holt, David J.   +7 more
core   +3 more sources

Ring-Closing Metathesis Approach to Dictyostatin.

Organic Letters, 2005
An esterification/ring-closing metathesis approach to dictyostatin and discodermolide is introduced. The approach provides for facile fragment coupling of two main segments of these natural products at the C10-C11 alkene with high to complete Z ...
Brückner, Arndt M, Curran, Dennis P, Cyrous O. Kangani, Dennis P. Curran, Arndt M. Brueckner, Kangani, Cyrous O   +5 more
core   +3 more sources

Solvents for ring-closing metathesis reactions

Chemical Communications, 2008
A study of the influence of eight diverse solvents on a Grubbs II-catalysed ring-closing metathesis (RCM) reaction reveals a complex dependence of the different reaction steps on the solvent and suggests acetic acid as a useful solvent for RCM ...
Cooper, G. (Gregory), Taylor, Paul C., Clarke, Adam J., Adjiman, Claire S.   +3 more
core   +3 more sources

2.10 Ring-Closing Metathesis

, 2016
Ring-closing metathesis (RCM) has emerged as a powerful synthetic tool. Depending on the unsaturated functional groups involved, ring-closing-metathesis reactions are classified into three categories: diene ring-closing metathesis, enyne ring-closing ...
D. Lee, V. R. Sabbasani
core   +2 more sources

Selective Enyne Ring-Closing Metathesis with Main Group Metal Catalysts [PDF]

, 2022
Ring-closing metathesis (RCM) represents an ideal and atom-economical way to construct cyclic compounds. The precedented reaction systems for endo-selective enyne RCM mainly rely on precious transition metal carbene complexes or activated substrates ...
Zhi-Xiang, Yu, Chi, Zhang, Lian-Gang, Zhuo, Yi, Wang   +3 more
core   +1 more source

The catalytic performance of Ru–NHC alkylidene complexes: PCy3 versus pyridine as the dissociating ligand

Beilstein Journal of Organic Chemistry, 2010
The catalytic performance of NHC-ligated Ru-indenylidene or benzylidene complexes bearing a tricyclohexylphosphine or a pyridine ligand in ring closing metathesis (RCM), cross metathesis, and ring closing enyne metathesis (RCEYM) reactions is compared ...
Stefan Krehl, Diana Geißler, Sylvia Hauke, Oliver Kunz, Lucia Staude, Bernd Schmidt   +5 more
doaj   +1 more source

Studies Towards the Total Synthesis of Di- and Sesterterpenes with Dicyclopenta[a,d]cyclooctane Skeletons. Three-component Approach to the A/B Rings Building Block

Molecules, 2005
Sesqui- and sesterterpenes of ophiobolin and fusicoccin families are important synthetic targets because of complexity of structure and potentially useful physiological activities, including anti-tumor activity.
J. Wicha, M. Michalak, K. Michalak
doaj   +1 more source

Synthesis of fluorinated δ-lactams via cycloisomerization of gem-difluoropropargyl amides

Beilstein Journal of Organic Chemistry, 2010
gem-Difluoro-1,7-enyne amides are suitable building blocks for the synthesis of difluorodihydropyridinones via a ring-closing metathesis reaction, and of 4,4-difluoro-3-oxoisoquinolines through a ring-closing metathesis–enyne metathesis tandem reaction ...
Satoru Arimitsu, Gerald B. Hammond
doaj   +1 more source