Functions of Phytic Acid in Fabricating Metal‐Free Carbocatalyst for Oxidative Coupling of Benzylamines^†

Abstract

of main observation and conclusion Sustainable phytic acid and cellulose are selected as precursors to fabricate P-doped carbon material (C-P-500), which possesses the high surface area and exhibits excellent catalytic activity and stability in the oxidative coupling of benzylamines (conversion > 95%, yield > 95%). During the carbonization of cellulose in the muffle furnace, phytic acid can efficiently prevent the cellulose-derived carbon from combustion and create micro/meso porous structure because of its special function of fire retardation. Control experiments and characterizations demonstrate that P-containing groups anchoring on C-P-500 improve the catalytic performance of carbocatalyst in the oxidation of benzylamines to imines. The excellent catalytic activity of C-P-500 should be contributed collectively by carbonyl and P=O(OH)2 groups. Due to the sustainable property of precursors and simple methodology for fabricating P-doped carbocatalyst, along with the moderate reaction conditions, it is a green catalytic system for the oxidative coupling of benzylamines to imines.

Construction of a Phytic Acid–Silica System in Wood for Highly Efficient Flame Retardancy and Smoke Suppression

“…The char residue of PA/Wood was incompact and crumbly, showing numerous extensive cracks on its surface. This condition resulted from the low thermal stability of P-catalyzed char at high temperatures [ 20 ]. In Figure 6 , the deformed structure of PA/Wood before combustion may be the other reason for the cracks.…”

“…The potential mechanism may be explained as follows. In a flame scenario, phosphorus elements from PA catalyzed the dehydration of cellulosic substances and promoted char formation in the initial stages of pyrolysis [ 20 ]. The protective char residue on the wood surface could prevent the underlying wood substrate from direct exposure to the flame [ 72 ].…”

“…However, phosphorus FRs are effective only in treatments with high weight percentage gain. These conditions are related to the low thermal stability of P-catalyzed char at high temperatures [ 20 ]. Meanwhile, smoke production increases with the addition of a high phosphorus FR content.…”

Fe2Mn(μ3‐O)(COO)6 Cluster Based Stable MOF for Oxidative Coupling of Amines via Heterometallic Synergy

“…[ 3‐6 ] However, this kind of approach still possesses some shortcomings, for instance, the relative inactivity of benzylamines with electron‐ withdrawing groups or aliphatic amines, the possible generation of unwanted by‐products, and the difficulty in synthesizing asymmetrically substituted imines. [ 7‐8 ] To this end, a large number of catalytic systems including noble metal, [ 9‐12 ] non‐noble metal, [ 13‐16 ] and metal free [ 17‐20 ] based catalysts have been established and shown excellent conversion and selectivity. Nevertheless, obvious disadvantages, such as high cost, inefficient time‐ and energy‐ consumption, complex preparation process, and worrisome stability, largely restrained their wide applications.…”

Printable High-Voltage Integrated Microsupercapacitors Based on Heteroatom-Doped Porous Biomass Carbon

“…All of the Raman spectra of the corresponding materials presented two characteristic Raman shifts located at about 1350 (D band) and 1580 cm −1 (G band), which were attributed to the out-of-plane breathing modes from the defect sites and the in-plane vibration of the graphitic lattice, respectively. 35,36 It has been established that the intensity ratio (I D /I G ) of the D band to the G band was related to the defect degree of the carbon materials. The ratio of I D /I G for NSC-700-3 (0.88) was much smaller compared to that with KNSC, which could be attributed to the formation of abundant micropores and mesopores in KNSC as well as the incorporation of a largeradius sulfur atom induced by KOH.…”