Syndioselective Coordination (Co)Polymerization of
Alkyne-Substituted Styrenes Using Rare-Earth Metal Catalysts
Posted on 2020-07-15 - 11:40
Developing convenient
methods to introduce functional groups into
syndiotactic polystyrene has gained increasing attention in recent
years. Herein, we report the coordination polymerization of 4-(1-hexynyl)styrene
(HES), 4-(phenylethynyl)styrene (PES), and 4-(trimethylsilyl)ethynylstyrene
(TES) with half-sandwich scandium precursor C5Me4PhSc(CH2C6H4NMe2-o)2 (1) and constrained-geometry-configuration
(CGC) precursors C13H8CH2PySc(CH2SiMe3)2 (2, Py = C5H4N) and 2,7-(tBu)2C13H8CH2PyLn(CH2SiMe3)2(THF)n (Ln
= Sc (3a), n = 0; Y (3b), Lu (3c), n = 1). Under mild conditions,
perfect syndiotactic products (rrrr > 99%) are
produced
by homopolymerizations of HES, PES, and TES. The random copolymerizations
of TES and styrene (St) proceed smoothly with 3b, and
the insertion fractions of TES are tuned in the range of 0–100
mol % via changing the TES-to-St feed ratio. The trimethylsilyl groups
are facilely eliminated from the TES-based polymers by tetrabutylammonium
fluoride to give terminal ethynyl-containing polystyrenes, the reactions
of which with an azide compound, carbon dioxide, and anthracene-9-aldehyde
afford a series of functional syndiotactic polystyrenes.
CITE THIS COLLECTION
DataCiteDataCite
3 Biotech3 Biotech
3D Printing in Medicine3D Printing in Medicine
3D Research3D Research
3D-Printed Materials and Systems3D-Printed Materials and Systems
4OR4OR
AAPG BulletinAAPG Bulletin
AAPS OpenAAPS Open
AAPS PharmSciTechAAPS PharmSciTech
Abhandlungen aus dem Mathematischen Seminar der Universität HamburgAbhandlungen aus dem Mathematischen Seminar der Universität Hamburg
ABI Technik (German)ABI Technik (German)
Academic MedicineAcademic Medicine
Academic PediatricsAcademic Pediatrics
Academic PsychiatryAcademic Psychiatry
Academic QuestionsAcademic Questions
Academy of Management DiscoveriesAcademy of Management Discoveries
Academy of Management JournalAcademy of Management Journal
Academy of Management Learning and EducationAcademy of Management Learning and Education
Academy of Management PerspectivesAcademy of Management Perspectives
Academy of Management ProceedingsAcademy of Management Proceedings
Academy of Management ReviewAcademy of Management Review
Zhang, Zhen; Dou, Yanli; Cai, Zhongyi; Liu, Dongtao; Li, Shihui; Cui, Dongmei (2020). Syndioselective Coordination (Co)Polymerization of
Alkyne-Substituted Styrenes Using Rare-Earth Metal Catalysts. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.0c01237