Co₂(CO)₈‐Catalyzed Base‐Free Arylsulfonyl Transfer Process via the S‐N Bond Cleavage of N‐Cyano‐N‐Phenyl Arenesulfonamides

Abstract

Air-and bench-stable N-cyano-N-phenyl arenesulfonamides (NCASs) have been demonstrated to be sulfonylating agents for the synthesis of N-arylsulfonyl benzimidazoles catalyzed by dicobalt octacarbony, Co 2 (CO) 8 , without any bases. This protocol undergoes an intermolecular N-to N-arylsulfonyl transfer process involving the SÀ N bond cleavage of NCASs instead of normal CN group migration via the CÀ N bond scission.[a] Dr.

TEMPO-Catalyzed Aminophosphinoylation of Ethers via Tandem C(sp3)–H and C(sp3)–O Bond Cleavage

“…Recently, the cross-coupling reaction involving α-C–H functionalization of ether has emerged as a powerful and attractive protocol for construction of the C–X (X = C, S, N, P) bond . In most cases, the C–O bond cleavage of ether does not occur, and the ether structural unit was introduced to the organic framework via C–H functionalization of ethers. , So far, a few synthetic methods have been reported for difunctionalization of ethers via tandem C–H and C–O bond cleavage, in which transition-metal catalysts, strong oxidants, or high reaction temperature are usually required. − For example, Li and co-workers described Fe-catalyzed reactions of indoles with ethers for the synthesis of 1,1-bis-indolylmethane derivatives via C–H bond oxidation and C–O bond cleavage in the presence of ( t -BuO) 2 . Wang reported Mn-catalyzed three-component synthesis of 1,5-amino/keto alcohols from Grignard reagents, imines/nitriles, and tetrahydrofuran (THF) through C–H and C–O bond cleavage of THF .…”

Impact of fiber‐type and autoclave‐treatment at different temperatures on the mechanical properties and interface performance of various fiber‐reinforced 3D‐printed composites

“…Finally, all the fiber reinforced composite coupons achieve the failure point and fractures. [ 45 ] As a consequence, less reduction in slope at 180°C is observed due to improved interface bonding for all composite coupons as compared to the non‐autoclave fiber reinforced composite coupons.…”

A surface modification of polylactic acid composites for additive manufacturing with modified chopped carbon fiber and modified nano‐hydroxyapatite

“…Among them, many literatures show that hydroxyapatite (HA) and/or CF can be used to effectively improve the fusion interface state and mechanical behavior, however, the addition of the strengthening phases was nearly all conducted by mixing in whole with twin‐screw extrusion, which means a complex and costly way. [ 26–32 ] Custodio et al [ 26 ] used a twin‐screw extruder to prepare PLA/HA composites, and got an increase of tensile strength from 32.7 to 47.3 MPa when the content of HA is 15 wt%. In order to improve the poor interface of PLA parts, Ko et al [ 28 ] prepared HA‐g‐PLA composites with HA being grafted with PLA in advance, and the flexural strength of HA‐g‐PLA composites was 49% higher than that of pure PLA when the content of HA was 10 wt%.…”

“…In order to improve the poor interface of PLA parts, Ko et al [ 28 ] prepared HA‐g‐PLA composites with HA being grafted with PLA in advance, and the flexural strength of HA‐g‐PLA composites was 49% higher than that of pure PLA when the content of HA was 10 wt%. Li et al [ 29 ] studied the effect of carbon fiber (CF) on the properties of PLA. The above research results provide the valuable reference for this article to explore the appropriate content of n‐HA and CF.…”