有哪些信誉好的足球投注网站synthesis and crystal structure of 1-(3-fluorophenyl)-2-thioxo-2,3-dihydroquinazolin-4(1h)-one合成和晶体结构的1 -(3-fluorophenyl)2-thioxo-2 3-dihydroquinazolin-4u2014u2014(1 h).pdfVIP
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synthesis and crystal structure of 1-(3-fluorophenyl)-2-thioxo-2,3-dihydroquinazolin-4(1h)-one合成和晶体结构的1 -(3-fluorophenyl)2-thioxo-2 3-dihydroquinazolin-4u2014u2014(1 h)
Crystals 2011, 1, 254-259; doi:10.3390/cryst1040254 OPEN ACCESS crystals ISSN 2073-4352 /journal/crystals Communication Synthesis and Crystal Structure of 1-(3-Fluorophenyl)-2-thioxo- 2,3-dihydroquinazolin-4(1H)-one Aamer Saeed 1,* and Ulrich Flörke 2 1 Department of Chemistry, Quaid-I-Azam University, Islamabad 45320, Pakistan 2 Department Chemie, Fakultät fur Naturwissenschaften, Universität Paderborn, Warburgerstrasse 100, D-33098 Paderborn, Germany * Author to whom correspondence should be addressed; E-Mail: aamersaeed@; Tel.: +92-51-9064-2128; Fax: +92-51-9064-2241. Received: 22 October 2011 / Accepted: 7 December 2011 / Published: 8 December 2011 Abstract: The base catalyzed intramolecular nucleophilic cyclization of 1-(2-bromobenzoyl)-3-(2-fluorophenyl)thiourea (1) in the presence of N,N-dimethyl formamide (DMF) afforded the 1-(3-fluorophenyl)-2-thioxo-2,3-dihydroquinazolin-4(1H)-one (2) by an intramolecular nucleophilic substitution SNAr mechanism. The structure was supported by the spectroscopic data and unambiguously confirmed by the single crystal X- ray diffraction data. It crystallizes in the orthorhombic space group P na21 with unit cell 3 dimensions a = 22.430(4), b = 8.1478(16), c = 13.522(3) Å, V = 2471.2(9) Å . There are two independent molecules per asymmetric unit that are l
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