Conversion of tributylstannylferrocene to a variety of heteroaryl ferrocenes
摘要:
Tributylstannylferrocene (Fc-SnBu3) was converted to a variety of heteroaryl ferrocenes, such as 2-thiophenyl, 3-thiophenyl, 3-pyridyl, 3-quinolyl, 4-oxazolyl and 4-isoxazolyl ferrocene, by using Pd-catalyzed reactions. The Stille-coupling catalyst (PdCl2-PPh3) promotes the reaction between Fc-SnBu3 and electron-deficient heterocyclic bromides, while a modified catalyst (Pd-Ph3P-CuO) proves to be the choice for the coupling of Fc-SnBu3 with electron-rich heterocyclic bromides. (C) 2000 Elsevier Science S.A. All rights reserved.
Knoevenagel condensation of ferrocenyl substituted carboxaldehydes with methylene active compounds on inorganic supports and the NLO properties of the resulting push–pull alkenes
作者:Erik Stankovic、Stefan Toma、Roel Van Boxel、Inge Asselberghs、André Persoons
DOI:10.1016/s0022-328x(01)00946-9
日期:2001.12
We report a new method for the condensation of nonamethylferrocenecarboxaldehyde, 3-ferrocenylacrolein, 5-ferrocenylthiophene-2-carboxaldehyde and 5'-ferrocenyl-2,2' -bithienyl-5-carboxaldehyde inorganic supports, with methylene active compounds on the inorganic supports. In this way, conditions leading to very high yield ( > 70%) of the product could be achieved. The effect of sonication during the synthesis of nonamethylferrocenecarboxaldehyde is reported and appears to be of great importance. We also report a new method for the synthesis of 3-ferrocenylacrolein. The second-order non-linear optical (NLO) properties of these ferrocenecarboxaldehyde condensation products are measured with the hyper-Rayleigh scattering (HRS) technique. The results of a similar study made for the condensation products of the above-mentioned aldehydes with malononitrile and indan-1,3-indandione are also given. (C) 2001 Elsevier Science B.V. All rights reserved.