π-Extended conjugate phenylacetylenes. Synthesis of 4-[(E) and (Z)-2-(4-ethenylphenyl)ethenyl]pyridine. Dimerization, quaternation and formation of charge–transfer complexes
摘要:
The conjugate (E)- and (Z)-(4'-pyridylethenyl)-4-phenylethyne (E-4 and Z-4) has been satisfactorily prepared by two different routes: (a) by dehydrohalogenation of 4'-pyridylethenyl-4-phenyi-beta-chloroethene; (b) by the Wittig reaction between p-(iodobenzyl)(triphenyl)phosphine ylide and 4-pyridinecarboxaldehyde, E/Z isomer separation, and cross-coupling with 2-methyl-but-3-yn-2-ol followed the propanone elimination. The Glaser oxidative dimerization of (Z)-4 yields (Z,Z)-1,4-di[(4'-pyridylethenyl)-4-phenyll-buta-1,3-diyne in good yield, (Z,Z)-5. (E,E)-5 was obtained by phase transfer oxidative dimerisation of (E)-4 in presence of their N-methyl salt (E)-10. Mono-and di-N-methylated salts of conjugate (E,E)-5 and (Z,Z)-5, were obtained by quaternation with iodomethane. The (Z,Z)-5 di-N-methylated salt forms charge-transfer complexes with TCNE, TCNQ and TMPD. (C) 2003 Elsevier Science Ltd. All rights reserved.
Chromophoric Lewis Base Adducts of Methyltrioxorhenium: Synthesis, Catalysis and Photochemistry
作者:Simone A. Hauser、Valentina Korinth、Eberhardt Herdtweck、Mirza Cokoja、Wolfgang A. Herrmann、Fritz E. Kühn
DOI:10.1002/ejic.201000348
日期:2010.9
A series of chromophoricLewisbaseadducts of methyltrioxorhenium (MTO) was examined. The ligands were pyridine derivatives with different size of the aromatic system and variable substituents, thus providing a variation of electronic and steric parameters. The complexes were fully characterised (UV/Vis, IR and NMR spectroscopy, single-crystal X-ray diffraction and elemental analysis) and their stability
研究了一系列甲基三氧铼 (MTO) 的发色路易斯碱加合物。配体是具有不同大小的芳香系统和可变取代基的吡啶衍生物,因此提供了电子和空间参数的变化。对配合物进行了充分表征(UV/Vis、IR 和 NMR 光谱、单晶 X 射线衍射和元素分析),并通过 UV/Vis 光谱测定了它们在二氯甲烷中的稳定性常数。此外,本报告还研究了与 MTO 配位的这些 N-供体配体对 1-辛烯环氧化催化活性的影响。每个化合物测试两次;在避光和日光下进行催化反应。未发现催化性能有显着差异。通过 (17)O-NMR 和 UV/Vis 光谱研究了配合物在紫外光照射下的行为。本文公开的实验旨在探讨 MTO 加合物中发色 N 供体配体的潜在有益作用,因为它们可能通过提供额外的能量来削弱在催化循环中必须断裂的键来激活催化系统。
Shunmugasundaram, A.; Balakumar, S., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1985, vol. 24, # 9, p. 775 - 777
作者:Shunmugasundaram, A.、Balakumar, S.
DOI:——
日期:——
Photo-dehydro-Diels–Alder reaction of 1-phenyl-2-(pyridyl)acetylenes in acidic aqueous solution
The photocycloaddition of 1-(4-R-phenyl)-2-(4-pyridyl)acetylenes (R = H, Br, CH3, Cl) and 1-(4-R-phenyl)-2-(2-pyridyl)acetylenes (R = H, Br, Cl) was carried out in acidic aqueous solution. The unexpected photo-dehydro-Diels-Alder reaction of these monomers was observed, and the results show that two monomers react in a head-to-tail manner and lead to the formation of 2-phenyl-1,3-di(pyridyl)naphthalene derivatives. This reaction presents a direct metal-free method to construct the 1,2,3-triaryl substituted naphthalenes from diarylacetylenes. (C) 2013 Elsevier B.V. All rights reserved.
Shunmugasundaram, A.; Thanulingam, T. Lekshmana; Murugesan, R., Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical and Analytical, 1990, vol. 29, # 9, p. 852 - 855
作者:Shunmugasundaram, A.、Thanulingam, T. Lekshmana、Murugesan, R.