Copper-catalyzed aerobic asymmetric cross-dehydrogenative coupling of C(sp<sup>3</sup>)–H bonds driven by visible light
作者:Kexu Zhou、Ying Yu、Yu-Mei Lin、Yanjun Li、Lei Gong
DOI:10.1039/d0gc00262c
日期:——
Asymmetric cross-dehydrogenative coupling (CDC) of C(sp3)–H bonds shows great potential for rapid and stereoselective construction of C–Cbonds and use of molecular oxygen as the oxidant for such transformations is appealing in the context of green synthetic methodologies. However, the poor reactivity of oxygen at the ground state and the challenges in controlling the stereochemistry make it extremely
A polymer includes repeat units having the structure
wherein R
1
, R
2
, Ar
1
, Ar
2
, and Ar
3
are defined herein. The polymer can be prepared by Suzuki polycondensation. The acetal and/or ketal functionality in the polymer backbone make the backbone-cleavable in acid. The polymer is useful in applications including lithographic photoresists.
A polybutadiene composition comprising a polybutadiene type polymer and a compound represented by the following formula (I):
1
wherein Ar
1
and Ar
2
each independently represent an aromatic ring, X and Y each independently represent an alkylene group having one or two carbon atoms, an oxygen atom or a carbonyl group, is provided; and thermal degradation of the polybutadiene type polymer can be prevented even in an air-free environment.
一种聚丁二烯组合物,由聚丁二烯类聚合物和下式(I)所代表的化合物组成:
1
其中 Ar
1
和 Ar
2
分别独立地代表一个芳香环,X 和 Y 分别独立地代表一个或两个碳原子的亚烷基、一个氧原子或一个羰基;即使在无空气环境中,也能防止聚丁二烯型聚合物的热降解。
Sabatier; Mailhe, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1910, vol. 151, p. 494
作者:Sabatier、Mailhe
DOI:——
日期:——
Reilly; Drumm; Barrett, Journal of the Chemical Society, 1927, p. 70