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Your search keyword '"Shu, Wen‐Ming"' showing total 40 results
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40 results on '"Shu, Wen‐Ming"'

4. Box–Behnken response surface method for the synthesis of high‐temperature‐ and salt‐resistant filter loss reducers.

Author

Yang, Fan, Li, Da‐Qi, Song, Yong‐Tao, Zhang, Ying, Shu, Wen‐Ming, and Yu, Wei‐Chu

Subjects
SLURRY, FOURIER transform infrared spectroscopy, PARTICLE size distribution, DRILLING fluids, TRANSMISSION electron microscopy, DRILLING muds
Abstract

Wellbores are destabilized by the immersion of a formation in drilling fluid during deep well drilling. To address this issue, in the present study, trimethylolethane triallyl ether (TMETE), 2‐acrylamide‐2‐methylpropanesulfonic acid (AMPS), acrylamide, and N‐vinylpyrrolidone undergo free radical copolymerization to produce a PTAAN filter loss reducer. The Box–Behnken response surface method is used to optimize the synthesis of PTAAN; the optimal conditions are 1 wt% TMETE and 0.1111 wt% initiator at 60°C. Fourier transform infrared spectroscopy, transmission electron microscopy, and thermogravimetric analysis are used to characterize the composition, micromorphology, and thermal stability of the PTAAN product, respectively. The synthesized product is resistant to high temperatures and salt under the optimal synthesis conditions. It has an API filtration loss of 8.2 mL for freshwater‐based mud, an API filtration loss of 13.8 mL for 20% by weight brine mud after aging at 220°C, and an API filtration loss of 29.5 mL at 150°C under high temperatures and pressures. Incorporating PTAAN into the base slurry prevents clay particle agglomeration at elevated temperatures and high mineralization, resulting in a broader clay particle size distribution and ultimately leading to the formation of a thin and compact filter cake. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Efficient Synthesis of 2-Aminoquinazoline Derivatives via Acid-Mediated [4+2] Annulation of N -Benzyl Cyanamides.

Author

Qin, Zhao-Yi, Sun, Chen-Xi, Zhang, Wen-Wen, Li, Jun-Ru, Gong, Yin-Xiang, Shu, Wen-Ming, and Wu, An-Xin

Subjects
CALCIUM cyanamide, ANNULATION, HYDROCHLORIC acid
Abstract

The synthesis of 2-aminoquinazoline derivatives is achieved by using hydrochloric acid as a mediator in the [4+2] annulation reaction between N-benzyl cyanamides and 2-amino aryl ketones. In addition, 2-amino-4-iminoquinazolines are synthesized by the reaction of 2-aminobenzonitriles, instead of 2-amino aryl ketones, with N-benzyl cyanamides. A wide range of substrates can be used and high yields are obtained, demonstrating the practicality of this method for the synthesis of 2-aminoquinazoline derivatives. [ABSTRACT FROM AUTHOR]

Published
2023
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10. I2‐Mediated Oxidative Amidation of Aryl Methyl Ketones: Synthesis of Primary α‐Ketoamides Using Ammonium Carbamodithioate as Amine Surrogate.

Author

Wang, An‐Jing, Zhang, Yu‐Die, Nan, Wen‐Jing, Liu, Shan, Shu, Wen‐Ming, and Gong, Yin‐Xiang

Subjects
METHYL ketones, AMIDATION, AMMONIUM, AMINES, IODINATION
Abstract

Here we report the preparation of primary α‐ketoamides via a highly efficient molecular iodine‐mediated oxidative amidation of aryl methyl ketones with ammonium carbamodithioate. A self‐sequenced iodination/nucleophilic substitution/Kornblum oxidation/amidation mechanism was proposed. In this mechanism, α‐thiocyanatoacetophenone is the key intermediate. [ABSTRACT FROM AUTHOR]

Published
2023
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40. Multicomponent Coupling Cyclization Access to Cinnolines via in Situ Generated Diazene with Arynes, and α-Bromo Ketones.

Author

Shu WM, Ma JR, Zheng KL, and Wu AX

Subjects
Catalysis, Cyclization, Molecular Structure, Stereoisomerism, Heterocyclic Compounds, 2-Ring chemistry, Hydrocarbons, Brominated chemistry, Imides chemistry, Ketones chemistry
Abstract

A transition-metal-free multicomponent coupling cyclization reaction was explored involving arynes, tosylhydrazine, and α-bromo ketones. The reaction proceeds via a formal [2 + 2 + 2] cycloaddition, giving access to cinnoline derivatives in moderate yields under mild conditions. Three chemical bonds were formed-two C-N bonds and one C-C bond-in a single step.

Published
2016
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