1271-51-8, Name is Vinylferrocene, belongs to iron-catalyst compound, is a common compound. SDS of cas: 1271-51-8In an article, once mentioned the new application about 1271-51-8.
Synthesis, spectra and crystal structure of (E)-(CO)2(NO)Cr[(eta5-C5H 4)-CH=CH(eta5-C5H4)]Cr(CO) 2(NO)
Compounds 1,2-bis[(eta5-cyclopentadienyl)dicarbonylnitrosylchromium]ethene (7) (hereafter called 1,2-dicynichrodenylethene) and 1,2-diferrocenylethene (10) were prepared from formylcynichrodene (3) and formylferrocene (9), respectively, via the McMurry’s low-valent titanium coupling method. Compounds (eta5-vinylcyclopentadienyl)dicarbonylnitrosylchromium (6) and vinylferrocene (11) were obtained by the dehydration of the corresponding alcohols. The structure of 7 was solved by an X-ray diffraction study: space group, P21/c; monoclinic; a=6.379(5), b=11.295(3) and c=11.9352(24); Z=2. It turns out that compound 7 adopts a transoid conformation at the ethenylene bridge and the two cyclopentadienyl rings are coplanar. The nitrosyl group in each cynichrodenyl moiety of 7 is located at the side towards the corresponding ethenylene carbon atom with a twist angle of 46.5. The chemical shifts of H(2)-H(5) protons and C(2)-C(5) carbon atoms of a series of vinyl derivatives of compounds bearing cyclopentadienyl rings have been assigned using two-dimensional HetCOR-NMR spectroscopy. For the derivatives of cynichrodene (1) and ferrocene, it was found that the shielding of C(2,5) and C(3,4) carbon atoms is parallel to the shielding of the ortho- and para-carbon atoms of benzene derivatives. The electron density distribution in the cyclopentadienyl ring is discussed on the basis of 13C-NMR data. Surprisingly, the vinyl group donates electron density to the adjacent cynichrodene moieties rather than withdraws from them.
Synthesis, spectra and crystal structure of (E)-(CO)2(NO)Cr[(eta5-C5H 4)-CH=CH(eta5-C5H4)]Cr(CO) 2(NO)
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Reference£º
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion