Correction: In-chain functionalized syndiotactic 1,2-polybutadiene by a Ziegler-Natta iron(iii) catalytic system.

[This corrects the article DOI: 10.1039/C9RA06499K.].

In-chain functionalized syndiotactic 1,2-polybutadiene by a Ziegler-Natta iron(iii) catalytic system.

Copolymerization of 1,3-butadiene with four 1-substituted 1,3-diene comonomers bearing amino and alkyoxy groups by a Ziegler-Natta iron(iii) catalytic system to access in-chain functionalized syndiotactic 1,2-polybutadiene is reported herein. The polar comonomer content can be easily regulated by varying the comonomer loadings or polymerization conditions, affording functionalized syndiotactic 1,2-polybutadiene with different amounts of functionalities. The incorporation of a polar comonomer showed little influence on the 1,2-content and stereoregularity of the resulting polymers, giving a 1,2-structure as high as ∼85% and an pentad of 81.

CtIP is required for DNA damage-dependent induction of P21.

DNA endonuclease CtIP is involved in both DNA double-strand break (DSB) repair and transcriptional repression/activation. The cyclin-dependent kinase inhibitor P21, which is induced at transcription level in response to a variety of stresses, controls G₁/S transition. In this report, we found that CtIP bound to the P21 promoter, and this binding was enhanced in response to DNA damage.