Synthesis and Spectroscopic Characterisation of a New Class of Heterobimetallic Homoleptic Diethanolaminate Complexes of Niobium(V) and Tantalum(V)

Abstract

Nine heterobimetallic homoleptic diethanolaminate complexes of the types: [Nb(Rdea) 3 {Ta(Rdea) 2 }] (where Rdea = RN(CH 2 CH 2 O -) 2 and R = H, 2; Me, 3; Bu n , 4; Ph, 5), [Nb(Rdea) 3 {Al(Rdea)}] (R = H, 6; Me, 7; Bu n , 8; Ph, 9), and [Nb(Phdea) 3 {Sb(Phdea)}] 10 have been prepared for the first time by the equimolar reactions of [Nb(Rdea) 2 (RdeaH)] with [Ta(Rdea) 2 (OPr i )] or [Al(Rdea)(OPr i )] or [Sb(Phdea)(OPr i )] in benzene. The structural features of the new complexes have been elucidated by IR and NMR ( 1 H, 27 Al) spectroscopies.

New Complexes of Antimony(III) with Tridentate O,E,O-Ligands (E = O, S, Se, Te, NH, NMe) Derived from N-Methyldiethanolamine

“…Diethanolamine is a widely used compound bearing two electron withdrawing hydroxy moieties and a nitrogen donor atom. Complexes of transition metals with diethanolamine and related ligand molecules have been investigated for decades [ 21 , 22 , 23 , 24 ]. Also, complexes of diethanolamine with tin have been reported [ 25 ] and silatranes were studied extensively, e.g., [ 26 , 27 , 28 , 29 ].…”

Three Component Reaction: An Efficient Synthesis of 3,4‐Dihydropyrimidin‐2(1H)‐ones and Thiones Using Heterogeneous Catalyst

“…9 Dihydropyrimidinones have been prepared by employing protic acids, [10][11][12] Lewis acids, [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] triflates, 29,30 microwave irradiation, [31][32][33][34] ionic liquids 35,36 and clays. 37,38 Unfortunately, many of these processes suffer major or minor limitations, such as drastic reaction conditions, low yields, expensive and toxic reagents, stoichiometric amounts of catalysts, strongly acidic conditions, long reaction time, and incompatibility with other functional groups. Very recently, Sr(NO 3 ) 2 , 39 polyoxometalate catalysts, 40 12-molybdophosphoric acid, 41 silica-supported heteropoly acid, 42 Dowex-50W, 43 modified zeolite-type E4a, 44 and natural HEU type zeolite, 45 aqueous HBF 4 , 46 and polyaniline-HBF 4 -dodecyl hydrogensulfate, 47 have been used for Biginelli cyclocondensation to give dihydropyrimidinones.…”