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Heteroaromatization with 4-Hydroxycoumarin Part II: Synthesis of Some New Pyrano[2,3-d]pyrimidines, [1,2,4]triazolo[1,5-c]pyrimidines and Pyrimido[1,6-b]-[1,2,4]triazine Derivatives
Molecules 2001, 6(6), 528-532; doi:10.3390/60600528

Synthesis of Bis (2,2,6,6-tetramethyl-4-piperidinyl) Maleate

, , ,  and
College of Chemical Engineering, Zhengzhou University, Zhengzhou, 450002, P. R. China
* Author to whom correspondence should be addressed.
Received: 22 August 2000 / Revised: 20 March 2001 / Accepted: 8 May 2001 / Published: 31 May 2001
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Bis (2,2,6,6-tetramethyl-4-piperidinyl) maleate is a key intermediate for the synthesis of new types of hindered amine light stabilizers (HALS), so new synthetic routes to this compound are desirable. Through an orthogonal design and follow-up single factor experiments optimal reaction conditions were determined for synthesizing bis (2,2,6,6-tetramethyl-4-piperidiny) maleate using dimethyl maleate, 2,2,6,6-tetramethyl-4-piperidinol and zeolite supported tetraisopropyl titanate as catalyst. Under the selected conditions, the reaction rate and the yield are high, the selectivity is good, the catalyst can be recycled, and there are fewer wastes. The product was characterized and quantitatively analyzed by elemental analysis, mass spectrometry, infrared spectroscopy, nuclear magnetic resonance spectroscopy and ion suppression chromatography.
Keywords: Bis (2; 2; 6; 6-tetramethyl-4-piperidinyl) maleate; molecular synthesis Bis (2; 2; 6; 6-tetramethyl-4-piperidinyl) maleate; molecular synthesis
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Wang, F.A.; Zhu, J.; Song, J.; Zhai, S.; Wang, L. Synthesis of Bis (2,2,6,6-tetramethyl-4-piperidinyl) Maleate. Molecules 2001, 6, 528-532.

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