scholarly journals A Simple and Direct Synthesis of 3-Methylene-1, 4-diarylazetidin-2-ones and (E)-3-Arylidene-1-phenylazetidin-2-ones Using Baylis–Hillman Derivatives

2014 ◽  
Vol 67 (2) ◽  
pp. 295 ◽  
Author(s):  
Manickam Bakthadoss ◽  
Jayakumar Srinivasan ◽  
Raman Selvakumar
Keyword(s):  
Direct Method ◽  
Direct Synthesis ◽  
Single Step ◽  
Amino Ester ◽  
Derivatives Of ◽  
A Direct Method

Herein we describe a direct method, promoted by potassium tert-butoxide (KOtBu), for the synthesis of highly substituted α-methylene β-lactams and α-arylidene β-lactams from the amino ester intermediates derived from the acetates and bromo derivatives of the Baylis–Hillman adducts. A variety of β-lactams was synthesized in a single step with good yields.

scholarly journals A direct method for the N-tetraalkylation of azamacrocycles

2016 ◽  
Vol 12 ◽  
pp. 2457-2461 ◽  
Author(s):  
Andrew J Counsell ◽  
Angus T Jones ◽  
Matthew H Todd ◽  
Peter J Rutledge
Keyword(s):  
Crystal Structure ◽  
Direct Method ◽  
Direct Synthesis ◽  
Benzyl Bromide ◽  
Solvent System ◽  
Propargyl Bromide ◽  
Partially Miscible ◽  
Derivatives Of ◽  
A Direct Method ◽  
Organic Solvent System

An efficient protocol for the direct synthesis of N-tetraalkylated derivatives of the azamacrocycles cyclam and cyclen has been developed, using a partially miscible aqueous–organic solvent system with propargyl bromide, benzyl bromide, and related halides. The method works most effectively when the reaction mixture is shaken, not stirred. A crystal structure of the N-tetrapropargyl cyclam derivative 1,4,8,11-tetra(prop-2-yn-1-yl)-1,4,8,11-tetraazacyclotetradecane diperchlorate is reported.

A direct method for the preparation of 2-hydroxyethoxymethyl derivatives of guanine, adenine, and cytosine

1980 ◽  
Vol 23 (5) ◽  
pp. 572-574 ◽  
Author(s):  
Jorge R. Barrio ◽  
Jerry D. Bryant ◽  
Gene E. Keyser
Keyword(s):  
Direct Method ◽  
Derivatives Of ◽  
A Direct Method

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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