The NARC-Based Approach to the Enantioselective Synthesis of the Zaragozic Acids. Synthesis of a C 5-Alkoxycarbonyl-Substituted 2,8-Dioxabicyclo[3.2.1]octane.

2000 ◽  
Vol 53 (4) ◽  
pp. 349 ◽  
Author(s):  
Patrick Perlmutter ◽  
Walailak Selajarern
Keyword(s):  
Nucleophilic Addition ◽  
Direct Method ◽  
Enantioselective Synthesis ◽  
Ring Closure ◽  
Zaragozic Acids ◽  
A Direct Method

A direct method for the preparation of C 5-alkoxycarbonyl-substituted 2,8-dioxabicyclo[3.2.1]octanes is described. The key process involves a highly stereoselective (NARC) sequence of a nucleophilic addition followed by ring closure.

scholarly journals Donald W. Cameron

2000 ◽  
Vol 53 (4) ◽  
pp. 241
Author(s):  
Jenny M. Cameron
Keyword(s):  
Nucleophilic Addition ◽  
Direct Method ◽  
Ring Closure ◽  
A Direct Method

A direct method for the preparation of C 5-alkoxycarbonyl-substituted 2,8-dioxabicyclo[3.2.1]octanes is described. The key process involves a highly stereoselective (NARC) sequence of a nucleophilic addition followed by ring closure.

A New Nucleophilic Addition/Ring-Closure Sequence. Enantioselective Synthesis of 3-Deoxy-8-oxatropanes

2004 ◽  
Vol 6 (6) ◽  
pp. 893-895 ◽  
Author(s):  
Giang Nguyen ◽  
Patrick Perlmutter ◽  
Mark L. Rose ◽  
Filisaty Vounatsos
Keyword(s):  
Nucleophilic Addition ◽  
Enantioselective Synthesis ◽  
Ring Closure

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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