An efficient, selective, and solventless approach to carbamates in DBU-derived ionic liquids: Experimental and theoretical investigations

Verma, Khushboo; Sharma, Ashutosh; Singh, Jasminder; Badru, Rahul

doi:10.1016/j.scp.2023.101117

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…The oxidative carbonylation of amines necessitates the presence of oxidants, such as molecular oxygen, 25−27 nitro compounds, iodine, quinone, its derivatives, 28 or unsaturated organic substances. 29,30 Among these, molecular oxygen serves 42 Zn/SiO 2 6 80 2:1 68.5 --hexamethylenediamine 43 KATriz 10 30 3:1 ---∼100 aniline 44 [BuDBU]Ala IL 4 120 10:1 89.9 --aniline 45 ZrO 2 /SiO 2 7 170 20:1 ---80.1 aniline 46 ZIF-7 (Zn(BeIM) 2 ) 2 190 12:1 92.0 --aniline 47 Ce 0.98 Zr 0.02 O 2 7.5 140 30:1 88.0 --toluene diamine 48 Zr-MOF-808@MCM-41 3 160 12:1 95/0 --toluene diamine 49 CeO 2 7.5 140 30:1 90.0 --toluene diamine 50 Au as the primary oxidant. This reaction entails a mixture of CO and O 2 , which can be potentially explosive within a specific concentration range.…”

Section: Oxidative Carbonylation Of Amine Compoundsmentioning

confidence: 99%

How To Get Isocyanate?

Guo,

Ding,

Wang

2024

ACS Omega

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Isocyanate, a pivotal chemical intermediate to synthesize polyurethane with widespread applications in household appliances, automobiles, and construction, is predominantly produced via the phosgene process, which currently holds a paramount status in industrial isocyanate production. Nonetheless, concerns arise from the toxicity of phosgene and the corrosiveness of hydrogen chloride, posing safety hazards. The synthesis of isocyanate using nonphosgene methods represents a promising avenue for future development. This article primarily focuses on the nonphosgene approach, which involves the formation of carbamate through the reaction of nitro-amino compounds with carbon monoxide, dimethyl carbonate, and urea, among other reagents, subsequently leading to the thermal decomposition of carbamate to get isocyanate. This paper emphasizes the progress in catalyst development during the carbamate decomposition process. Single-component metal catalysts, particularly zinc, exhibit advantages such as high activity, cost-effectiveness, and compatibility with a wide range of substrates. Composite catalysts enhance isocyanate yield by introducing a second component to adjust the active metal composition. The central research direction aims to optimize catalyst adaptation to reaction conditions, including temperature, pressure, time, and solvent, to achieve high raw material conversion and product yield.

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