14316-14-4Relevant articles and documents
Synthesis and crystal structures of multifunctional tosylates as basis for star-shaped poly(2-ethyl-2-oxazoline)s
Hoogenboom, Richard,Fijten, Martin W. M.,Kickelbick, Guido,Schubert, Ulrich S.
, p. 773 - 783 (2010)
The synthesis of well-defined polymer architectures is of major importance for the development of complex functional materials. In this contribution, we discuss the synthesis of a range of multifunctional star-shaped tosylates as potential initiators for the living cationic ring-opening polymerization (CROP) of 2-oxazolines resulting in star-shaped polymers. The synthesis of the tosylates was performed by esterification of the corresponding alcohols with tosyl chloride. Recrystallization of these tosylate compounds afforded single crystals, and the X-ray crystal structures of di-, tetra-and hexa-tosylates are reported. The use of tetra-and hexatosylates, based on (di)pentaerythritol as initiators for the CROP of 2-ethyl-2-oxazoline, resulted in very slow initiation and illdefined polymers, which is most likely caused by steric hindrance in these initiators. As a consequence, a porphyrin-cored tetratosylate initiator was prepared, which yielded a well-defined star-shaped poly(2-ethyl-2-oxazoline) by CROP as demonstrated by SEC with RI, UV and diode-array detectors, as well as by 1H NMR spectroscopy.
Dual Nickel- And Photoredox-Catalyzed Reductive Cross-Coupling to Access Chiral Trifluoromethylated Alkanes
Zhou, Pan,Li, Xinxuan,Wang, Dong,Xu, Tao
supporting information, p. 4683 - 4687 (2021/06/28)
A dual nickel/photoredox-catalyzed enantioselective reductive cross-coupling of aryl halides with CF3-substituted racemic alkyl electrophiles has been established. The approach accommodates a broad palette of aryl iodides and alkyl bromides to access a va
Copper-catalyzed enantioselective alkene carboetherification for the synthesis of saturated six-membered cyclic ethers
Berhane, Ilyas A.,Burde, Ameya S.,Chemler, Sherry R.,Kennedy-Ellis, Jonathan J.,Zurek, Eva
supporting information, p. 10099 - 10102 (2021/10/06)
The enantioselective copper-catalyzed oxidative coupling of alkenols with styrenes for the construction of dihydropyrans, isochromans, pyrans and morpholines is reported. A concise formal synthesis of a σ1receptor ligand using this alkene carbo