Pd-catalysis: A useful tool in polymer synthesis. Recent advances and applications

Advances in organometallic chemistry, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Язык: Английский

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Effect of the Alkyl Side-Chain Structure on Melting Point of Atactic Poly(alkoxycarbonylmethylene)s: Incorporation of Amide-Linkage Leading to Polymers with High Melting Point

Macromolecules, Год журнала: 2023, Номер 56(12), С. 4639 - 4648

Опубликована: Июнь 12, 2023

Diazoacetates with a variety of alkyl groups as an ester substituent were prepared and polymerized by Pd-based initiating systems to afford atactic poly(alkoxycarbonylmethylene)s (PACMs), the effect side-chain structure on thermophysical properties [melting point (Tm) glass transition temperature (Tg)] was investigated differential scanning calorimetry analyses. The use series linear two-way-branched side chains various chain lengths not so effective for raising Tm PACMs. On other hand, incorporation amide-linkage in middle is quite because hydrogen-bonding interaction among amide-linkages chains, where spacer length between ester- crucial Tm. highest around 130 °C attained C4 outer C7 C9.

Язык: Английский

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A salicylaldiminate/Pd(trifluoroacetate)₂ [SalAld/Pd(tfa)₂] initiating system for C1 polymerization of diazoacetate: generation of an active initiator from ordinary reagents with facile procedures

Polymer Chemistry, Год журнала: 2024, Номер 15(11), С. 1077 - 1084

Опубликована: Янв. 1, 2024

SalAld/Pd(tfa) 2 initiating systems have been revealed to be effective for C1 polymerization of diazoacetate, yielding moderately syndiotactic polymers with high M n in moderate yield.

Язык: Английский

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Postpolymerization modification of poly(2-alkoxyethoxycarbonylmethylene)s: Efficient formation and reactivity of the ketene silyl acetal repeating units in the polymer main chain

Polymer Journal, Год журнала: 2024, Номер 56(6), С. 569 - 576

Опубликована: Фев. 21, 2024

Язык: Английский

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Recent Advance of Diazo Compounds in Polymer Synthesis^★

Acta Chimica Sinica, Год журнала: 2023, Номер 81(8), С. 1015 - 1015

Опубликована: Янв. 1, 2023

Based on the well development of diazo compound transformations in organic synthesis, it is expected to extend its applications field polymer synthesis.It vital importance transform efficient reactions compounds into new polymerization methodology order afford polymers with structures and functions.Currently, there still great potential application synthesis.This review highlights recent advancements synthesis chemistry compounds, including chain-growth polymerization, step-growth end-group functionalization post-polymerization modification.Transition-metal-catalyzed diazoacetates constructs C-C main chain from one carbon unit.Through catalytic diazoacetate high molecular weight polymers, stereocontrol living/controlled can be realized successively.The stepwise originated their conversions.The insertion reaction O-H N-H bonds extended polyethers, polyesters polyamines that are not easily accessible through other synthetic methods, while cross-coupling via metal carbene insertion-migration mechanism realize novel structures.Diazoacetates diazomalonates employed regulate terminal synthesized metal-catalyzed vinyl addition or ring-opening metathesis olefins, successively end-capped by carbene.The modifications based applied introduction polar functional groups polyolefin.Compared copolymerization strategy avoids depressed reactivity varied monomers, applicable a broad scope groups.The thermal mechanical properties improved this method.Finally, future challenges expanding approaches prospected review.

Язык: Английский

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Syndiotactic Poly(Substituted Methylene)s with Alkyloxycarbonyl Side Chains: Effects of Side Chain Chirality on the Main Chain Helix and Crystallinity

Macromolecular Chemistry and Physics, Год журнала: 2023, Номер 225(5)

Опубликована: Ноя. 13, 2023

Abstract Syndiotactic poly(substituted methylene)s ( st ‐PMs) with alkyloxycarbonyl side chains form hexagonal columnar liquid crystals (Col h LCs), wherein the main chain adopting either right‐ or left‐handed helices is arranged in a 2D lattice. This study investigates conformation for ‐PMs chiral chains, designated as st‐ P8(3,7Me)‐ f S S. ‐P8(3,7Me)‐ polymers possess 3,7‐dimethyloctyloxycarbonyl at different S‐enantiomeric fractions, . In an > 50%, adopts one‐handed helical along longer contour increasing The influences crystallinity of polymers. Chiral crystallize Col LCs upon cooling. crystallite size, melting temperature, and fusion enthalpy increase Racemic ‐P8(3,7Me)‐50S does not crystallize.

Язык: Английский

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Crystal Structure of Inclusion Compounds Based on Porous Trans-Thienothiophendicarboxylate of Europium(III) with Norbornadiene and Trans-Cinnamyl Alcohol

Journal of Structural Chemistry, Год журнала: 2023, Номер 64(12), С. 2417 - 2426

Опубликована: Дек. 1, 2023

Язык: Английский

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Synthesis and electrochromic properties of polyamines containing a 4,4′-diaminotriphenylamine-N,N′-diyl unit in the polymer backbone: Ru-catalyzed N–H insertion polycondensation of 1,4-phenylenebis(diazoacetate) with 4,4′-diaminotriphenylamine derivatives

Polymer Chemistry, Год журнала: 2022, Номер 13(46), С. 6369 - 6376

Опубликована: Янв. 1, 2022

Polycondensation of a bis(diazocarbonyl) compound and diaminotriphenylamine derivatization via Ru-catalyzed N–H insertion to afford electroactive polyamine.

Язык: Английский

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Exploiting the Reversible Dimerization of N-Heterocyclic Carbenes to Access Dynamic Polymer Networks with an Organocatalytic Activity

ACS Macro Letters, Год журнала: 2024, Номер 13(8), С. 1008 - 1015

Опубликована: Июль 25, 2024

The capability of some

Язык: Английский

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N‐heterocyclic carbene copper complexes catalyze the C1 polymerization of substituted diazomethanes

Journal of Polymer Science, Год журнала: 2024, Номер unknown

Опубликована: Сен. 18, 2024

Abstract The C1 polymerization of substituted diazomethanes, including diazoethane and 2,2,2‐trifluoromethyl diazomethane, are reported. N ‐heterocyclic carbene copper complexes were employed as catalysts for the reactions afforded corresponding persubstituted polymers containing methyl or trifluoromethyl units along backbones polymer products. characterized using size exclusion chromatography, a variety spectroscopic thermal techniques, contact angle measurements. Polymers prepared methodology described herein more hydrophobic than related that obtained standard C2 method fluorinated determined to be their hydrogenated analogues. relationship between fluorine content wettability was quantified.

Язык: Английский

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