17854-07-8Relevant articles and documents
ARYLVANADIUM-VERBINDUNGEN. XI. ZUR REAKTION VON TRIMESITYLVANADIUM MIT KETONEN
Kreisel, G.,Seidel, W.
, p. 301 - 306 (1984)
Trimesitylvanadium in solution reacts with a series of ketones.Depending upon the structures of the ketones these reactions yield olefins, alcohols or a radical, respectively.Sterically hindered ketones only form coordination compounds with trimesitylvana
Reductive Homocoupling of Organohalides Using Nickel(II) Chloride and Samarium Metal
Liu, Yongjun,Xiao, Shuhuan,Qi, Yan,Du, Feng
, p. 673 - 678 (2017/03/22)
A homocoupling method for organohalides and organosulfonates promoted by samarium metal and HMPA, and catalyzed by NiCl2 has been developed. Various organohalides (benzyl, aryl, heterocyclic, alkenyl and alkyl halides), α-haloacetophenones, and phenyl organosulfonates were tolerated, and the reaction afforded coupling products with high efficiency. Excellent chemoselectivity was exhibited between halides and other groups, such as ?COOH, ?NO2, halogen, heterocyclic ring, ester, and ketone groups. The stereoselectivity suggested that the reaction mechanism might involve an organosamarium species.
Direct construction of quaternary carbons from carbonyl compounds utilizing low-valent vanadium complexes
Kataoka, Yasutaka,Makihira, Isamu,Akiyama, Hiroaki,Tani, Kazuhide
, p. 9525 - 9540 (2007/10/03)
Direct geminal diallylation of a carbonyl compound with allyl bromide has been achieved in the presence of a low-valent vanadium complex and zinc. The diallylation has been found to proceed stepwise and the two allyl groups were introduced successively. By applying this method, one-pot synthesis of asymmetric quaternary carbons has been accomplished. As the first alkylating reagent a combination of allyl bromide and zinc, a Grignard reagent, or an alkyllithium can be used. The second one should be the combination of a low- valent vanadium(II) complex and allyl bromide, benzyl bromide, or propargyl bromide. Strong oxophilicity of the low-valent vanadium facilitated the deoxygenative allylation.
Reactions of hexacarbonyl derivatives of group 5 metals (V, Nb, Ta) with 9,10-phenanthrenequinone
Calderazzo, F.,Pampaloni, G.
, p. 47 - 60 (2007/10/02)
9,10-Phenanthreneqinone (PQ) derivatives of vanadium, niobim and tantalum of formula V(C14H8O2)3 and Na (M = V, Nb, Ta) have been prepared: (a) by reaction with PQ of the carbonyl derivatives V(CO) and Na (M = V, Nb, Ta) and (b) by reaction of the anhydros metal chlorides VCl3 and M2Cl10 (M = Nb, Ta) with the mono- or di-anion of PQ.Reaction of Na (M = Nb, Ta) with hydrogen chloride has given the protonated species H in good yields.Treatment of V(C14H8O2)3 or Na with sodium sand in THF gave the reduced derivatives of formula Nan (n = 1, 2, 3) which were isolated and identified by elemental analysis and IR spectroscopy.Oxidation of the anionic species by silver ions was examined.The reduced species Na3 (M = V, Nb, Ta) react with benzyl chloride or triphenyl methylchloride in THF to give dibenzyl and hexaphenylethane. respectively.
