A phase-transfer crystallization pathway to synthesize ultrasmall silicoaluminophosphate for enhanced catalytic conversion of dimethylether-to-olefin

CrystEngComm ◽  
2019 ◽  
Vol 21 (4) ◽  
pp. 577-582 ◽  
Author(s):  
Hongxin Ding ◽  
Jiajia Ding ◽  
Wei Liu ◽  
Xiaoling Zhao ◽  
Qijin Chi ◽  
...  
Keyword(s):  
Phase Transfer ◽  
Catalytic Conversion ◽  
Olefin Conversion ◽  
New Phase

This work reports a new phase-transfer crystallization pathway to generate ultrasmall silicoaluminophosphate SAPO-34 for enhanced catalytic dimethylether-to-olefin conversion.

Dipeptide-Based Phosphonium Salt Catalysis: Application to Enantioselective Synthesis of Fused Tri- and Tetrasubstituted Aziridines

Synlett ◽  
2019 ◽  
Vol 30 (19) ◽  
pp. 2101-2106 ◽  
Author(s):  
Jia-Hong Wu ◽  
Jianke Pan ◽  
Tianli Wang
Keyword(s):  
Phosphonium Salt ◽  
Phase Transfer ◽  
Asymmetric Reactions ◽  
Phosphonium Salts ◽  
Catalytic Systems ◽  
The Past ◽  
Versatile Tool ◽  
Quaternary Phosphonium Salt ◽  
Near Future ◽  
New Phase

Over the past decades, phase-transfer catalysis (PTC), generally based on numerous chiral quaternary ammonium salts, has been recognized as a powerful and versatile tool for organic synthesis in both industry and academia. In sharp contrast, PTC involving chiral phosphonium salts as the catalysts is insufficiently developed. Recently, our group realized the first enantioselective aza-Darzens reaction for preparing tri- and tetrasubstituted aziridine derivatives under bifunctional phosphonium salt catalysis. This article briefly discusses the recent development in asymmetric reactions (mainly including nucleophilic additions and cyclizations) promoted by chiral quaternary phosphonium salt catalysts. We expect that more catalytic asymmetric reactions will be developed on the basis of such new phase-transfer catalytic systems in the near future.

Polymer-supported oligo(N-acetyliminoethylenes) new phase transfer catalysts

1986 ◽  
Vol 15 (6) ◽  
pp. 485-490 ◽  
Author(s):  
J. Kahovec ◽  
M. Jel�nkov� ◽  
V. Janout
Keyword(s):  
Phase Transfer ◽  
Phase Transfer Catalysts ◽  
Polymer Supported ◽  
New Phase

Studies on the Depolymerization of Poly(ethylene terephthalate) Using 1, 1, 2, 2-Tetramethyl-1-Benzyl-2-n-Octyl Ethylene-1, 2-Diammonium Bromide Chloride as Phase Transfer Catalyst

2014 ◽  
Vol 938 ◽  
pp. 164-169
Author(s):  
V. Lakshmi Narayanan ◽  
M.J. Umapathy
Keyword(s):  
Alkaline Hydrolysis ◽  
Zinc Sulfate ◽  
Ethylene Terephthalate ◽  
Phase Transfer ◽  
Phase Transfer Catalyst ◽  
Dimethyl Benzyl ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Hydrolysis Of ◽  
New Phase

1,4-Bis (dimethyl) benzyl octyl ethylene diammonium bromide chloride has been synthesized, characterized and applied as new phase transfer catalyst in the alkaline hydrolysis of PET leading to depolymerisation. The new phase transfer catalyst has been compared with the alkaline hydrolysis of PET using zinc sulfate as catalyst in the depolymerization. It was found that the newly synthesized phase transfer catalyst exhibited excellent conversion than the alkaline hydrolysis of PET using zinc sulfate as catalyst.

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