Use of Polyphosphoric Acid in the Hydrolysis of Chromone Esters

He, Xungui; Li, Zhiyu; You, Qidong

doi:10.1081/scc-120002508

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…Diels‐Alder reaction between (esterified) muconic acid and ethylene (high pressure) leads to the formation of the diesters of cyclohex‐2‐ene‐1,4‐dicarboxylic acid and cyclohex‐1‐ene‐1,4‐dicarboxylic acid, both of which can be converted to diethyl terephthalate (DET) in 80.6 % yield when using silicotungstic acid for the Diels‐Alder step (99 % yield) and Pd for the dehydrogenation reaction 104 . TPA can be obtained by hydrogenolysis of DET in a yield of 96 % using polyphosphoric acid 105 . It is noteworthy that muconic acid can also be obtained from lignin‐derived catechol (and by extension guaiacol and phenol) through chemical and biotechnological routes 103 .…”

Section: Resultsmentioning

confidence: 99%

A Diamine‐Oriented Biorefinery Concept Using Ammonia and Raney Ni as a Multifaceted Catalyst

bruyn

Barta

2022

Chemie Ingenieur Technik

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Diamines are important industrial chemicals. In this paper we outline the feasibility of lignocellulose as a source of diolcontaining molecules. We also illustrate the possibility of turning these diols into their diamines in good to excellent yields. Central to these transformations is the use of commercially available Raney Ni. For diol formation, the Raney Ni engages in hydrogenation and often also demethoxylation, that way funneling multiple components to one single molecule. For diamine formation, Raney Ni catalyzes hydrogen-borrowing mediated diamination in the presence of NH 3 .

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Section: Resultsmentioning

confidence: 99%

A Diamine‐Oriented Biorefinery Concept Using Ammonia and Raney Ni as a Multifaceted Catalyst

bruyn

Barta

2022

Chemie Ingenieur Technik

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“…Keeping in view the literature information of CA, we successfully hydrolyzed the rosmarinic acid (Scheme 1) in the presence of acid as catalysis (polyphosphoric acid) and obtained crystals of CA (He, Li, & You, 2015). The reaction was carried out by mixing 1 equivalent of RA with 15 equivalents of H 3 PO 4 to get a thick paste.…”

Section: Resultsmentioning

confidence: 99%