5597-50-2Relevant articles and documents
Semi-aromatic biobased polyesters derived from lignin and cyclic carbonates
Horn, Jessica,Locklin, Jason,Ring, John,White, Evan M.,Winfield, Demichael
supporting information, p. 9658 - 9668 (2021/12/09)
The synthesis of biobased aromatic polyesters from lignin-derived monomers has become well described in the literature, but robust extrusion, thermomechanical, tensile and degradation studies of these materials is lacking. In this work, we have systematically investigated the mechanical and biodegradation properties of semi-aromatic polyesters that can potentially be derived from lignin. AB monomers were synthesized from reduced analogues of coumaric, ferulic, and sinapic acids along with cyclic carbonates, where the synthetic methodology was assessed using E-Factor and EcoScale. Polymerization yielded both semi-crystalline and amorphous polyesters with mechanical properties varying over three orders of magnitude. Detailed characterization revealed a wide array of properties including a highly ductile thermoplastic, a strong and rigid thermoplastic, and an elastomer. Composting biodegradation tests showed both degradable and nondegradable polymers can be achieved in this class. This work demonstrates the versatility of this class of polymers and illustrates their potential to replace non-sustainably derived plastics. This journal is
A 2-formylphenylboronic acid (2FPBA)-maleimide crosslinker: a versatile platform for Cys-peptide-hydrazine conjugation and interplay
António, Jo?o P. M.,Faustino, Hélio,Gois, Pedro M. P.
, p. 6221 - 6226 (2021/07/28)
In this work, we describe the preparation of a heterobifunctional 2-formylphenylboronic acid (2-FPBA)-maleimide crosslinker and explore its versatility in the preparation of various bioconjugates. We demonstrate the straightforward attachment of hydrazine payloads to cysteine residues in peptides, as well as the crosslinking of different thiol-bearing peptides or payloads withN-terminal cysteine peptides. Importantly, the dynamic nature of the 2-FPBA handle enables an interplay between the thiazolidine and diazaborine forms, which allows obtaining various products controlled by (and in some cases independent of) the order of addition of the components.
Preparation process of high-purity iprolol hydrochloride
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Paragraph 0031, (2021/11/19)
The invention belongs to the technical field of organic chemistry and medical chemistry. In particular, the invention relates to a preparation process of high-purity iprolol hydrochloride. To the preparation process, p-hydroxyphenylpropionic acid and methanol are subjected to esterification reaction under the action of first catalyst, and the p-hydroxyphenylpropionic acid methyl ester and epoxy chloropropane are reacted under the action of second catalyst to obtain 3 - [4 - (2, 3 - epoxypropoxy) phenyl] propanoate, and then, methyl propionate is added in the methyl alcohol solvent in this order to obtain methyl p-hydroxybenzenepropanoic acid methyl ester and then in a methanolic solvent, and then the 3 - preparation 4 - process 2 can 3 - be carried out. The crude hydrochloride and hydrogen chloride is subjected to heating dissolution, activated carbon decoloration, cooling crystallization and centrifugation and drying operation in sequence to obtain final high-purity ilomolol hydrochloride with a total impurity lower than 0.5% and a single unknown single impurity lower than 0.05%.