Amide-Phosphonium Salt as Bifunctional Phase Transfer Catalyst for Asymmetric 1,6-Addition of Malonate Esters to para-Quinone Methides

2016 ◽  
Vol 81 (19) ◽  
pp. 9315-9325 ◽  
Author(s):  
Luo Ge ◽  
Xuehe Lu ◽  
Cang Cheng ◽  
Jie Chen ◽  
Weiguo Cao ◽  
...  
Keyword(s):  
Phosphonium Salt ◽  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Quinone Methides

New quaternary phosphonium salt as multi-site phase-transfer catalyst for various alkylation reactions

2016 ◽  
Vol 42 (12) ◽  
pp. 8345-8358
Author(s):  
Kottala Vijaya Ponmuthu ◽  
Duraimurugan Kumaraguru ◽  
Jesin Beneto Arockiam ◽  
Sadhasivam Velu ◽  
Murugesan Sepperumal ◽  
...  
Keyword(s):  
Phosphonium Salt ◽  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Quaternary Phosphonium Salt ◽  
Alkylation Reactions

scholarly journals Quaternary β2,2-amino acid derivatives by asymmetric addition of isoxazolidin-5-ones to para-quinone methides

2020 ◽  
Vol 56 (4) ◽  
pp. 579-582 ◽  
Author(s):  
Andreas Eitzinger ◽  
Michael Winter ◽  
Johannes Schörgenhumer ◽  
Mario Waser
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Amino Acid Derivatives ◽  
Quinone Methides ◽  
Chiral Phase ◽  
Asymmetric Addition

Novel densely functionalized β2,2-amino acids were obtained in almost enantiopure form using down to 20 ppm of a chiral phase-transfer catalyst.

Enantioselective [4 + 1] cycloaddition of ortho-quinone methides and bromomalonates under phase-transfer catalysis

2017 ◽  
Vol 15 (17) ◽  
pp. 3670-3673 ◽  
Author(s):  
Xiao-Lei Lian ◽  
Alafate Adili ◽  
Bin Liu ◽  
Zhong-Lin Tao ◽  
Zhi-Yong Han
Keyword(s):  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Cycloaddition Reaction ◽  
Phase Transfer Catalyst ◽  
Quinone Methides

An enantioselective [4 + 1] cycloaddition reaction of ortho-quinone methides and bromomalonates using a quinine and BINOL derived phase-transfer catalyst is described.

β-cyclodextrin grafted on lignin as inverse phase transfer catalyst for the oxidation of benzyl alcohol in H2O

Tetrahedron ◽  
2016 ◽  
Vol 72 (14) ◽  
pp. 1773-1781 ◽  
Author(s):  
Zujin Yang ◽  
Xia Zhang ◽  
Xingdong Yao ◽  
Yanxiong Fang ◽  
Hongyan Chen ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Oxidation Of Benzyl Alcohol ◽  
Inverse Phase Transfer Catalyst

Microwave Energy Pretreated In Situ Transesterification of Jatropha Curcas L in the Presence of Phase Transfer Catalyst

2014 ◽  
Vol 625 ◽  
pp. 267-270 ◽  
Author(s):  
Sintayehu Mekuria Hailegiorgis ◽  
Mahadzir Shuhaimi ◽  
Duvvuri Subbarao
Keyword(s):  
Statistical Model ◽  
Jatropha Curcas ◽  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
In Situ Transesterification ◽  
Heat Pretreatment ◽  
Seed Particles ◽  
Optimum Reaction ◽  
Microwave Heat

In the present work, microwave heat pretreatment of jatropha curcas seed particles and use of phase transfer catalyst (PTC) to enhance in-situ transesterification were utilized together. It was observed that use of alkaline BTMAOH as a PTC and microwave heat pretreatment of jatropha curcas seed particles had substantially increased the reaction rate of in-situ transesterification as compared to the reaction conducted with microwave untreated seeds in the absence of BTMAOH as a PTC. Statistical model equation was developed to investigate the interaction effect of reaction variables and establish optimum reaction condition. At optimum condition, experimentally obtained FAME yield (93.7±1.53% w/w) was in close agreement with statistical model predicted FAME yield (96.75%) at 38°C and 37 minutes of reaction time.

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