Zobrazeno 1 - 10
of 554
pro vyhledávání: '"Samir Z. Zard"'
Autor:
Mathias Destarac, Juliette Ruchmann-Sternchuss, Eric Van Gramberen, Xavier Vila, Samir Z. Zard
Publikováno v:
Molecules, Vol 29, Iss 10, p 2174 (2024)
Xanthates have long been described as poor RAFT/MADIX agents for styrene polymerization. Through the determination of chain transfer constants to xanthates, this work demonstrated beneficial capto-dative substituent effects for the leaving group of a
Externí odkaz:
https://doaj.org/article/813534bd7209458785323ee6a84ccf38
Autor:
Béatrice Quiclet-Sire, Samir Z. Zard
Publikováno v:
Molecules, Vol 28, Iss 22, p 7561 (2023)
The preparation and use of α-(acyloxy)alkyl xanthates to generate and capture α-(acyloxy)alkyl radicals is briefly reviewed. Their inter- and intramolecular additions to both activated and unactivated, electronically unbiased, alkenes, and to (hete
Externí odkaz:
https://doaj.org/article/ccc7232377c54bbb9ca44b4e22654f8c
Autor:
Samir Z. Zard
Publikováno v:
CHIMIA, Vol 74, Iss 1/2, Pp 9-17 (2020)
The degenerative xanthate addition transfer to alkenes allows the synthesis of a broad range of protected, and in some cases enantiopure, α, β, and γ-amino acids, including proline and pipecolic derivatives, as well as fluorinated congeners and β
Externí odkaz:
https://doaj.org/article/a645ede86e564ba2b048b4cbcea556dc
Autor:
Samir Z. Zard
Publikováno v:
Phosphorus, Sulfur, and Silicon and the Related Elements. :1-10
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6f6218fce28a831daa20f9c142dd4861
https://doi.org/10.1080/10426507.2023.2173755
https://doi.org/10.1080/10426507.2023.2173755
Autor:
Béatrice Quiclet-Sire, Samir Z. Zard
Publikováno v:
Organic & Biomolecular Chemistry. 21:910-924
The present account summarises routes to tetralones, tetralines, and naphthalenes based on the chemistry of xanthates developed in the authors' laboratory. The degenerative reversible transfer of xanthates allows radical addition even to unactivated,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d6a49e880de0fe3d00a91b234e4c4b8
https://doi.org/10.1039/d2ob02159e
https://doi.org/10.1039/d2ob02159e
Autor:
Xianzhu Zeng, Samir Z. Zard
Publikováno v:
Organic Letters. 24:5245-5248
A convergent route to 1,3-dithiolan-2-ones based on the radical addition of xanthates to allylic acetates is described. The process is modular, uses inexpensive starting materials and reagents, and is atom economical, since both sulfur atoms of the x
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87a4ce1754311220356963d62a1256c1
https://doi.org/10.1021/acs.orglett.2c02215
https://doi.org/10.1021/acs.orglett.2c02215
Publikováno v:
Organic Letters. 24:2878-2882
5,5-Dithiospiroketals are prepared by a double radical addition of α,α'-bisxanthyl acetone to an alkene followed by ionic or thermal cleavage of the xanthate groups and acid-catalyzed ring closure. A modification employs α-chloro-α'-xanthyl aceto
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24fb7fba3415cbe213831f5960097585
https://doi.org/10.1021/acs.orglett.2c00855
https://doi.org/10.1021/acs.orglett.2c00855
Publikováno v:
Organic Letters
A versatile strategy to access vicinally functionalized cyclopentanones and cyclohexanones is described. It takes advantage of new reagents, α-xanthyl enones, which can be prepared from the reaction of xanthate salts with the corresponding epoxyketo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3fa51a0b9bc38403a269e08cef271934
https://pubmed.ncbi.nlm.nih.gov/36534058
https://pubmed.ncbi.nlm.nih.gov/36534058
Publikováno v:
Organic Reactions. :1-257
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b4de6fb8a593382ca3515816bab0fba3
https://doi.org/10.1002/0471264180.or108.01
https://doi.org/10.1002/0471264180.or108.01
Autor:
Xianzhu Zeng, Samir Z. Zard
Publikováno v:
Organic letters. 24(29)
Convergent routes to 1,3-dithian-2-ones based on the radical addition of xanthates to alkenes possessing a suitably located (latent) leaving group are described. These can be converted into 1,2-dithiolanes by base-mediated hydrolysis and oxidation. A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0226e76c2469cc72d2e565350d049313
https://pubmed.ncbi.nlm.nih.gov/35861685
https://pubmed.ncbi.nlm.nih.gov/35861685