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The synthesis of oxygenate products, including cyclic ketones and phenol, from CO2 and water in the absence of gas-phase H2 has been demonstrated. The reaction takes place in sub-critical conditions at 300 °C and pressure at room temperature of 25 barg. This is the first observation of the production of cyclic ketones by this route, and represents a step towards the synthesis of chemical products including methanol, without relying on fossil sources or H2 - which carries a high carbon footprint in its production by conventional methods. Inspiration for these studies is taken directly from natural processes occurring in hydrothermal environments around ocean vents. Reactions over Al2O3 and zeolite-based catalysts have, for the first time, demonstrated the ability to use catalyst properties such as acidity and pore size to direct the reaction towards specific products. These catalysts enhance the production of longer-chained species (up to C8) with respect to conventional Fe catalysts due to the role of acid sites in catalysing rapid oligomerisation reactions. Notably, zeolite-based catalysts promoted the formation of cyclic ketones. These proof-of-concept studies show the potential of this process to contribute sustainable development through either targeting methanol production, as part of 'methanol economy' or longer-chained species including aromatics phenol and cyclic ketones.
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Herein a transition metal catalyst system for the selective synthesis of cyclic and linear acetals from the combined utilisation of carbon dioxide, molecular hydrogen and biomass derived diols is pres...
A facile method for the synthesis of N-aryl substituted azacycles from arylamines and cyclic ethers has been developed. In this study, arylamines were treated with cyclic ethers in the presence of POC...
Rationale Numerous new tin catalysts were recently developed that enable the synthesis of cyclic polylactides with broad variation of the molecular mass. The abundance of cyclics in MALDI TOF mass spe...
Cyclic peptides have been attracting a lot of attention in recent decades, especially in the area of drug discovery, as more and more naturally occurring cyclic peptides with diverse biological activi...
Linear and cyclic oligomers are unavoidable non-intentionally added substances (NIAS) present in food contact materials made from common polyesters such as polyethylene terephthalate (PET), polybutyle...
The purpose of this study is to evaluate the efficacy of two doses of 4-hydroxy tamoxifen (4-OHT) compared with placebo on the intensity of cyclic mastalgia in pre-menopausal women with re...
This research may explain whether a shortage of three special compounds called aromatic amino acids is responsible for the severe illness and high death rate of children with the kwashiork...
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Cyclic vomiting syndrome is a disorder characterized by nausea and vomiting, separated by periods without any symptoms. There is very little research on this field at this point and most d...
Phenylalanine and tyrosine are aromatic amino acids that people need to obtain in their diets. Amino acids are the building blocks for protein, are are therefore required to form tissues i...
A concave exterior region on some POLYCYCLIC AROMATIC HYDROCARBONS that have three phenyl rings in a non-linear arrangement.
A membrane-bound or cytosolic enzyme that catalyzes the synthesis of CYCLIC ADP-RIBOSE (cADPR) from nicotinamide adenine dinucleotide (NAD). This enzyme generally catalyzes the hydrolysis of cADPR to ADP-RIBOSE, as well, and sometimes the synthesis of cyclic ADP-ribose 2' phosphate (2'-P-cADPR) from NADP.
A group of compounds with three aromatic rings joined in linear arrangement.
Compounds with three aromatic rings in linear arrangement with a SULFUR in the center ring.
Compounds with three aromatic rings in linear arrangement with an OXYGEN in the center ring.