共查询到20条相似文献,搜索用时 15 毫秒
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《Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy》1990,46(6):1027-1033
The 1H and 13C NMR spectra of three isomeric dinaphthothiophenes are recorded. Chemical shift assignments were made on the basis of substituent chemical shift (SCS) effect arguments, coupling considerations, proton—proton auto-correlated homonulcear (COSY) two-dimensional spectroscopy, and proton—carbon heteronuclear correlation (HETCOR) two-dimensional spectroscopy. Some previously published 1H chemical shifts and coupling constants are compared with our data and some divergences are noted. 相似文献
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7,9-Bisdeoxycarminomycinone has been synthesised from 5-hydroxyquinizarin by two annelation routes involving nitronate addition to C-2 and aldol condensation at C-3. 4-Demethoxy-7,9-bisdeoxydaunomycinone has been synthesised efficiently by similar methods. 相似文献
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Zinniol 10, 3 - methoxy - 4 -methyl - 5 (3 - methyl - 2 - butenyloxy) - 1,2 - benzenedimethanol, a metabolite isolated from the pathogenic fungus Alternaria zinniae, has been synthesised. 相似文献
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Metacycloprodigiosin 1, a tripyrrole pigment isolated from Streptomyces longisporus ruber, has been synthesized by condensation of the meta-fused pyrrole 2, prepared from cyclododecanone, with the known methoxybipyrrole aldehyde precursor 3. 相似文献
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Summary The synthesis of vinylpyrrolidone from succinic acid was accomplished without the use of acetylene or increased pressure. 相似文献
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《Tetrahedron》1986,42(6):1621-1631
The first synthesis of pentaprismane, hexacyclo[4.4.0.02,5.03,9.04,8.07,10]decane, is presented with full experimental details. A new and practical synthesis for homopentaprismanone is developed as is methodology for the functionalization of a bridgehead position α to the carbonyl group of this cage compound. The latter uses a mixed acyloin reductive coupling. Favorakii contraction of the bridgehead functionalized homopentaprismanone is employed to enter the pentaprismane ring system. A brief discussion is given of th́e geometry of pentaprismane, of its behavior relative to cubane, and of the future of prismane chemistry. 相似文献
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Hirotaka Kudo Marvin L. Tedjamulia Raymond N. Castle Milton L. Lee 《Journal of heterocyclic chemistry》1984,21(6):1833-1839
The synthesis of phenanthro[1,2-c]dibenzothiophene (6) , phenanthro[4,3-c]dibenzothiophene (10) , phenanthro[2,1-a]dibenzothiophene (14) , phenanthro[3,4-a]dibenzothiophene (16) , phenanthro[1,2-a]dibenzothiophene (19) , phenanthro[2,1-b]dibenzothiophene (20) , 8-methylphenanthro[3,2-a]dibenzothiophene (24) , 7-methylphenanthro[1,2-a]dibenzothiophene (25) , phenanthro[3,4-a]dibenzothiophene (27) , phenanthro[4,3-a]-dibenzothiophene (28) , 6-methylphenanthro[2,3-a]dibenzothiophene (31) , and 5-methylphenanthro[4,3-a]dibenzothiophene (32) is described. 相似文献
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Belén Abarca Rafael Ballesteros Gurnos Jones 《Journal of heterocyclic chemistry》1984,21(6):1585-1588
A synthesis of the methylthieno[3,2-c]cyclohepteno[b]indole 7 from 2-methylthieno[3,2-b]cycloheptanone 3 is described. Unsuccessful attempts to prepare the isomeric thienocycloheptenoindole system present in formula 2 , from the dihydrobenzothiophenone 8 , and from derivatives of 5-(2-thienyl)-4-oxopentanoic acid, 17 and 18 , and from N-benzylcycloheptindol-1-one 22 were unsuccessful. The preparation of 4,5-dihydro-2-phenyl-1-thienylmethyl-3H-pyridazin-3-one 20 and of the 5-aminopyrazole 21 are reported. 相似文献