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Table of Contents

Molecules, Volume 7, Issue 10 (October 2002), Pages 721-776

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	p. 721-733 Min Shi, Chao-Qun Li and Jian-Kang Jiang Article: Different Reaction Patterns in the Baylis-Hillman Reaction of Aryl Aldehydes with Phenyl Vinyl Ketone, Phenyl Acrylate and Phenyl Thioacrylate Molecules 2002, 7(10), 721-733; doi:10.3390/71000721 Received: 27 August 2002; in revised form: 10 October 2002 / Accepted: 11 October 2002 / Published: 31 October 2002 Show/Hide Abstract | Download PDF Full-text (61 KB) Abstract: In the Baylis-Hillman reaction of aryl aldehydes with phenyl vinyl ketone we have observed exclusive formation of diadducts 4, and that the yields of diadduct can reach 80% with increasing amounts of phenyl vinyl ketone. On the other hand, for phenyl acrylate and phenyl thioacrylate, only the normal Baylis-Hillman adduct was obtained. The effects of substituents were also examined and a plausible reaction mechanism is proposed for the formation of compounds 4.
	p. 734-742 Mohammad Ali Zolfigol, Elahe Madrakian and Ezat Ghaemi Article: Silica Sulfuric Acid/ NaNO2 as a Novel Heterogeneous System for the Nitration of Phenols under Mild Conditions Molecules 2002, 7(10), 734-742; doi:10.3390/71000734 Received: 2 October 2002; in revised form: 14 October 2002 / Accepted: 14 October 2002 / Published: 31 October 2002 Show/Hide Abstract | Download PDF Full-text (43 KB) Abstract: Nitrophenols can be obtained in moderate to high yields via nitrosationoxidation of phenols with silica sulfuric acid, NaNO2 and wet SiO2 at room temperature. In situ generation of HNO2 and a radical cation mechanism via the nitrous acid catalyzed (NAC) pathway appear to be applicable to phenol nitration using these reagents.
	p. 743-750 Matthias Treu, Johannes Fröhlich and Ulrich Jordis Article: Preparation of Shortened Norbelladine Analogs Molecules 2002, 7(10), 743-750; doi:10.3390/71000743 Received: 1 November 2001; in revised form: 23 September 2002 / Accepted: 30 September 2002 / Published: 31 October 2002 Show/Hide Abstract | Download PDF Full-text (83 KB) Abstract: The preparation of N-[(2-bromo-5-hydroxy-4-methoxyphenyl)methyl]-N-[(4-hydroxyphenyl)methyl]formamide (5) and 2-bromo-5-hydroxy-α-[(4-hydroxyphenyl)-methyl]-4-methoxypropaneamide (10) is reported.
	p. 751-755 BiBi Fathemeh Mirjalili, Mohamad Ali Zolfigol and Abdolhamid Bamoniri Article: Deprotection of Acetals and Ketals by Silica Sulfuric Acid and Wet SiO2 Molecules 2002, 7(10), 751-755; doi:10.3390/71000751 Received: 25 October 2001; in revised form: 13 October 2002 / Accepted: 14 October 2002 / Published: 31 October 2002 Show/Hide Abstract | Download PDF Full-text (29 KB) Abstract: Neat chlorosulfonic acid reacts with silica gel to give silica sulfuric acid in which sulfuric acid is immobilized on the surface of silica gel via covalent bonds. A combination of silica sulfuric acid and wet SiO2 was used as an effective deacetalizating agent for the conversion of acetals to their corresponding carbonyl derivatives under thermal conditions.
	p. 756-766 Ahmed M. M. El-Saghier Article: A Simple Synthesis of Some New Thienopyridine and Thienopyrimidine Derivatives Molecules 2002, 7(10), 756-766; doi:10.3390/71000756 Received: 8 May 2002; in revised form: 25 August 2002 / Accepted: 18 September 2002 / Published: 31 October 2002 Show/Hide Abstract | Download PDF Full-text (52 KB) Abstract: A number of pyridothienopyridine (2, 3), pyridothienopyrimidine (6, 10), pyridothienotriazine (13), pyrimidothienopyrimidine (15, 16, 17a,b) and thienoimidazo-triazines (18) were obtained via interaction of 3-amino-5-phenylamino-2,4-dicarbonitrile (1) with different reagents.
	p. 767-776 Vassilios Loukas, Theodoros Markidis and George Kokotos Article: Amino Acid Based Synthesis of Chiral Long Chain Diamines and Tetramines Molecules 2002, 7(10), 767-776; doi:10.3390/71000767 Published: 31 October 2002 Show/Hide Abstract | Download PDF Full-text (127 KB) Abstract: A method for the synthesis of long chain diamines and tetramines starting from natural α-amino acids is reported. Diamines and tetramines were prepared through the Wittig olefination reaction of N-protected amino aldehydes obtained from phenylalanine and lysine. A 1,2,17,18-tetramine was synthesized using (2S)-1-azido-2-[bis(tert-butoxycarbonyl)-amino]-5-oxopentane as key-intermediate compound.
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