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Dihydrolevoglucosenone (Cyrene) is a bicyclic, chiral, seven-membered heterocyclic cycloalkanone which is a waste derived and fully biodegradable aprotic dipolar solvent. [4] [5] [6] It is an environmentally friendly alternative to dimethylformamide (DMF) and N-methyl-2-pyrrolidone (NMP). [7]
N-Methyl-2-pyrrolidone (NMP) is an organic compound consisting of a 5-membered lactam. It is a colorless liquid, although impure samples can appear yellow. It is a colorless liquid, although impure samples can appear yellow.
Gamma-Butyrolactone is used as a chemical solvent and a cleaning agent, [15] for example in paint stripping or for cleaning graffiti. [16] Butyrolactone is a precursor to other chemicals. Reaction with methylamine gives NMP, and with ammonia gives pyrrolidone. It is also used as a solvent in lotions and some polymers. [5]
The living nature of NMP is due to the persistent radical effect (PRE). [3] The PRE is a phenomenon observable in some radical systems which leads to the highly favored formation of one product to the near exclusion of other radical couplings due to one of the radical species being particularly stable, existing in greater and greater concentrations as the reaction progresses while the other ...
This complex has also been used for the coupling of aryl iodides and bromides in refluxing water as solvent and in the presence of air, using pyrrolidine as base and TBAB as additive, [40] although its efficiency was higher in N-methylpyrrolidinone (NMP) as solvent. Coupling of a diiodo substrate catalysed by the dipyridylpalladium complex. [41]
Some areas along the Interstate 95 corridor, such as Washington, D.C., and New York City, saw anywhere from a quick coating to an inch of snow Tuesday, while parts of northern New England got 2 to ...
N-Methyl-2-pyrrolidone (NMP) is used as the reaction solvent because it is stable at the high temperatures required for the synthesis and it dissolves both the sulfiding agent and the oligomeric intermediates. Linear, high-molecular-weight PPS that is capable of being extruded into film or melt spun into fiber was invented by Robert W. Campbell ...
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