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Synthesis and characterization of polyimides from 9,10-diphenoxy-1,2,3,4,5,6,7,8-octahydro-2,3,6,7-anthracenetetra-carboxylic 2,3:6,7-dianhydride

โœ Scribed by Yong Seok Kim; Jin Chul Jung

Publisher
Springer
Year
2001
Tongue
English
Weight
93 KB
Volume
46
Category
Article
ISSN
0170-0839

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6-(4-Chlorophenyl)-9,9-dimethyl-3,7-diox
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โœ Chen, Dong-Qin ;Li, Chun-Mei ;Tu, Shu-Jiang ๐Ÿ“‚ Article ๐Ÿ“… 2007 ๐Ÿ› International Union of Crystallography ๐ŸŒ English โš– 873 KB

The title compound, C 21 H 20 ClN 3 O 2 , was synthesized by the reaction of 4-chlorobenzaldehyde and 3-(5,5-dimethyl-3-oxocyclohex-1-enylamino)propanoic acid with malononitrile in ethylene glycol under microwave irradiation. The dihydropyridine ring has a boat conformation. The pyrimidine ring adop

4,4,7,7-Tetramethyl-2-tosyl-2,3,3a,4,6,7
4,4,7,7-Tetramethyl-2-tosyl-2,3,3a,4,6,7,8,9-octahydro-1H-pyrrolo[3,4-c]pyrano[6,5-b]cyclohexan-9-one
โœ Chinnakali, K. ;Sudha, D. ;Jayagopi, M. ;Raghunathan, R. ;Fun, Hoong-Kun ๐Ÿ“‚ Article ๐Ÿ“… 2007 ๐Ÿ› International Union of Crystallography ๐ŸŒ English โš– 835 KB

The title compound, C~22~H~29~NO~4~S, crystallizes with three independent molecules, __A__, __B__ and __C__, in the asymmetric unit. Each of the three independent molecules adopts a folded conformation, with the phenylsulfonyl group lying over the pyranocyclohexanone ring system, and with the pyrrol