N-Heterocyclic carbene catalysed 1,6-hydrophosphonylation of p-quinone methides and fuchsones: an atom economical route to unsymmetrical diaryl- and triarylmethyl phosphonates

2016 ◽  
Vol 14 (24) ◽  
pp. 5550-5554 ◽  
Author(s):  
Panjab Arde ◽  
Ramasamy Vijaya Anand
Keyword(s):  
Direct Method ◽  
Base Catalyst ◽  
Quinone Methides ◽  
Brønsted Base ◽  
A Direct Method

A direct method for the synthesis of diaryl- and triarylmethyl phosphonates through 1,6-hydrophosphonylation ofp-quinone methides and fuchsones using NHC as a Brønsted base catalyst is described.

Expedient access to unsymmetrical triarylmethanes through N-heterocyclic carbene catalysed 1,6-conjugate addition of 2-naphthols to para-quinone methides

RSC Advances ◽  
2016 ◽  
Vol 6 (81) ◽  
pp. 77111-77115 ◽  
Author(s):  
Panjab Arde ◽  
Ramasamy Vijaya Anand
Keyword(s):  
Conjugate Addition ◽  
Base Catalyst ◽  
Quinone Methides ◽  
Brønsted Base

A direct and atom-economical protocol for the synthesis of unsymmetrical triarylmethanes through 1,6-conjugate addition of 2-naphthols topara-quinone methides using N-heterocyclic carbene as a Brønsted base catalyst is described.

Exploring bis-(amino)cyclopropenylidene as a non-covalent Brønsted base catalyst in conjugate addition reactions

2018 ◽  
Vol 16 (3) ◽  
pp. 384-388 ◽  
Author(s):  
Gurdeep Singh ◽  
Prithwish Goswami ◽  
Ramasamy Vijaya Anand
Keyword(s):  
Conjugate Addition ◽  
Addition Reactions ◽  
Base Catalyst ◽  
Quinone Methides ◽  
Carbon Nucleophiles ◽  
Catalytic Application ◽  
Brønsted Base

The catalytic application of bis-(amino)cyclopropenylidene, as a non-covalent Brønsted base, in the 1,4- and 1,6-conjugate addition of carbon nucleophiles to enones andp-quinone methides, respectively, is described.

scholarly journals Plastic waste to fuels by hydrocracking at mild conditions

2021 ◽  
Vol 7 (17) ◽  
pp. eabf8283
Author(s):  
Sibao Liu ◽  
Pavel A. Kots ◽  
Brandon C. Vance ◽  
Andrew Danielson ◽  
Dionisios G. Vlachos
Keyword(s):  
Direct Method ◽  
Acid Sites ◽  
Liquid Fuels ◽  
High Yield ◽  
Tandem Catalysis ◽  
Hy Zeolite ◽  
Environmental Threat ◽  
Single Use ◽  
Initial Activation ◽  
A Direct Method

Single-use plastics impose an enormous environmental threat, but their recycling, especially of polyolefins, has been proven challenging. We report a direct method to selectively convert polyolefins to branched, liquid fuels including diesel, jet, and gasoline-range hydrocarbons, with high yield up to 85% over Pt/WO3/ZrO2 and HY zeolite in hydrogen at temperatures as low as 225°C. The process proceeds via tandem catalysis with initial activation of the polymer primarily over Pt, with subsequent cracking over the acid sites of WO3/ZrO2 and HY zeolite, isomerization over WO3/ZrO2 sites, and hydrogenation of olefin intermediates over Pt. The process can be tuned to convert different common plastic wastes, including low- and high-density polyethylene, polypropylene, polystyrene, everyday polyethylene bottles and bags, and composite plastics to desirable fuels and light lubricants.

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