Recent Advances in Iridium-Catalysed Transfer Hydrogenation Reactions

Lamata, M. Pilar; Passarelli, Vincenzo; Carmona, Daniel

doi:10.1007/3418_2020_59

Cited by 1 publication

(1 citation statement)

References 236 publications

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“…Finally, we isolated cyclic carbonate 4a and 5a using silica gel column chromatography; however, the yields were low. The desired saturated compounds 4b and 5b were obtained via the transition-metal-catalyzed transfer hydrogenation of the olefin groups , in cyclic carbonate 4a and 5a using 2-propanol as the hydrogen donor.…”

Section: Resultsmentioning

confidence: 99%

Suspended Alicyclic Skeleton: Synthetic Approach to Zero-Birefringence Polycarbonate

Toda,

Nakata,

Fukuoka

et al. 2024

Macromolecules

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Poly(cyclohexene carbonate) (PCHC) is a recyclable, sustainable, alicyclic polycarbonate that can be synthesized from CO 2 . However, the optical properties of PCHC, including birefringence, are not well understood. Herein, we designed novel carbonate units via two approaches: "fusion" and "suspension" of a norbornane skeleton to obtain PCHC-based zero-birefringence polycarbonates. Compared to PCHC, the in-plane retardation of the 100% uniaxially stretched norbornane-fused PCHC film was reduced, whereas the photoelastic coefficient unexpectedly increased. In contrast, the photoelastic birefringence of norbornanesuspended PCHC decreased. Furthermore, the copolymer synthesized via the copolymerization of cyclohexene carbonate with a tetracyclododecane-suspended monomer exhibited almost zero photoelastic birefringence. This result indicates that the photoelastic birefringence can be reduced by "suspending" the cyclic skeleton rather than "fusing" it. Computational studies suggested that the chair cyclohexane skeleton suppresses photoelastic birefringence. The results obtained in this study have the potential to guide the design of lowbirefringence polycarbonates and other polymers.

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Section: Resultsmentioning

confidence: 99%