Product Details of 80-59-1. In 2019 J ORGANOMET CHEM published article about RAY CRYSTAL-STRUCTURE; SPECTROSCOPIC PROPERTIES; HYDRIDE; ALKYL; CHEMISTRY; HYDROGENATION; NIOBIUM; KETENE; OXYGEN; CP’ in [Antinolo, Antonio; Garcia-Yuste, Santiago; Lopez-Solera, Isabel; Otero, Antonio; Teresa Tercero-Morales, Maria; Carrillo-Hermosilla, Fernando] Univ Castilla La Mancha, Fac Ciencias & Tecnol Quim, Dept Quim Inorgan Organ & Bioquim, Ctr Innovac Quim Avanzada ORFEO CINQA, Campus Ciudad Real,Campus Univ, E-13071 Ciudad Real, Spain in 2019, Cited 24. The Name is (E)-2-Methylbut-2-enoic acid. Through research, I have a further understanding and discovery of 80-59-1.
The reactions of the trihydride niobocene complex [NbCp’H-2(3)] (Cp’ = eta(5)-C5H4SiMe3) (1) with different alpha,beta-unsaturated carboxylic acids have been studied. The reactions with fumaric and maleic acids (A and B) gave a new dinuclear carboxylato-containing niobocene derivative [(NbCp'(2))(2)(mu-kappa O-2,O-OOC-CH2-CH2-COO-kappa O-2,O)] (2), due to the occurrence of two processes, dihydrogen elimination and hydrogenation of the C=C bond of the alpha,beta-unsaturated carboxylic acid. Likewise, the use of an alpha,beta-unsaturated carboxylic acid derivative such as mono-methyl fumarate (ester) (C) gave the mononuclear [NbCp'(2)(OOC-CH2-CH2-COOMe-kappa O-2,O)] (3). When other alpha,beta-unsaturated carboxylic acids with less activated alkenes were used, such as trans-cinnamic acid (F), (E)-2-methyl-3-phenylacrylic acid (G), cyclohex-1-ene-1-carboxylic acid (H), 3-methylbut-2-enoic acid (I), (E)-2-methylbut-2-enoic acid (J) or (E)-pent-2-enoic acid (K), only the complexes [NbCp'(2)(OOCR-kappa O-2,O)], (R = trans-CH = CHPh (4), trans-CMe = CHPh (5), 1-cyclohexenyl (6), (CH = CMe2) (7), (cis-CMe = CHMe) (8), (trans-C(H) = CH-Et) (9)), were isolated, respectively, resulting from a process with dihydrogen elimination and the hydrogenation of the C=C bond do not takes place. Treatment of 2-9 with CO (3 atm) promote that the coordination mode of the carboxylate ligand changes from (kappa O-2,O-OOC-R) to (kappa O-1-OOC-R) and yielding new carbonyl derivatives [(NbCp'(2))(2)(mu-kappa O-1-OOC-CH2-CH2-COO-kappa O-1) (CO)(2)] (10); and [NbCp'(2)(OOCR-kappa O-1) (CO)] (R = CH2-CH2-COOMe (11), trans-CH = CHPh (12), trans-CMe = CHPh (13), 1-cyclohexenyl (14), CH = CMe2 (15), cis-CMe = CHMe (16) and R = trans-CH] CH-Et) (17)). Reaction of 2 with O-2 afford a new diperoxo compound [{NbCp'(2)(O-2-kappa O-2,O)}(2) (mu – kappa O-1-OOC-CH2-CH2-COO-kappa O-1)] (19), through a monoperoxo derivative [NbCp'(2)(O-2-kappa O-2,O) (mu-kappa O-1-OOC-CH2-CH2-COO-kappa O-2,O) NbCp'(2)] (18). All the new complexes were characterized by usual IR and NMR spectroscopic methods and the crystal structure of 16 and 18 were determined by X-ray diffraction studies. (c) 2019 Elsevier B.V. All rights reserved.
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Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles