Selective transformation of propargylic ester towards tunable polymerization pathways

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 4, 2025

Divergent synthesis of numerous complex molecules has emerged as a promising strategy it allows the access to structurally distinct products from identical starting materials. However, selective transformation same monomer into diverse polymers by modulating polymerization conditions remains synthetic challenge. In this work, we report design propargylic ester, which can be selectively transformed polyimidate, polyimine, or polyamidine through pathways. By conditions, either ester migrating leaving manipulated with formation different nitrogen-containing intermediates including imine, ketenimine, and alkylidene ketenimine. Three types could exclusively obtained using one set combination containing sulfonyl azide. tunable ability for variable synthon monomer, facilitate varied transformations towards structure-diverse polymers.

Language: Английский

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Chain-growth synthesis of extensively cross-conjugated polyenes

Nature Synthesis, Journal Year: 2025, Volume and Issue: unknown

Published: March 10, 2025

Language: Английский

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Chain-Growth Synthesis of Extensively Cross-Conjugated Polyenes via Strained [3]Cumulenes

Published: July 24, 2024

For years, polyenes with an extensively cross-conjugated backbone have fascinated chemists by their unique opto-electronic properties and reactivities, but so far only short oligomers (≤ 12 vinylene units) are available through multi-step assembly of vinylic building blocks. Here, we report a single-step chain-growth approach that streamlines the synthesis up to 86 consecutive units averaged per chain well-defined end groups. This method highlights key interaction between organocopper species strained [3]cumulene, unlocking previously unknown 2,3-polymerization pathway. The resulting display decent two-photon-absorption capacity without compromising visible transparency, facilitating range two-photon lithography sub-diffraction-limit resolution.

Language: Английский

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Palladium-catalysed asymmetric cascade transformations of 4-alken-2-ynyl carbonates to construct complex frameworks

Chemical Science, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 27, 2024

A palladium-catalysed asymmetric auto-tandem reaction between 4-alken-2-ynyl carbonates and diverse ortho-functionalized activated alkenes is reported, giving complex frameworks in moderate yields with excellent chemo-, regio- stereoselectivity.

Language: Английский

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