F. Teixidor, J. Colomer, A. Llobet
Apr 1, 1987
Citations
0
Influential Citations
7
Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract The substitution of a hydrogen atom by other radicals has been achieved in 1,3-bis-(2-hydroxyphenyl) -1,3-propanedione (bhppH 3 ) at the methinic carbon by reacting the Co(II) complex of this β- diketone with different electrophiles. In most of the cases the reaction proceeded further to yield the corresponding flavones. To have a better range of solvents to carry on these reactions the Fe 3+ and Cr 3+ -bhppH 3 complexes were synthesized. The TLC of the solids obtained indicated the existence of several M-bhppH 3 complexes. The crystal structure of the Cr(bhppH 2 ) 3 ·0.5toluene is reported. Triclinic, P 1 , a = 14.282(3), b = 14.127(3), c = 12.240(2) A, α = 123.24(3), β = 94.72(2), γ = 90.87- (2)°, V =2053(1) A 3 , Z =2. Reaction of Fe- (bhppH 2 ) 3 with NBS yielded, after working up with SCN − , mostly dibrominated derivatives. Reaction of 2-diphenylmethyl-1,3-(2-hydroxyphenyl)-1,3- propanedione (dpmbhppH 3 ) with M(AcO) 2 · x H 2 O in pyridine (M=Ni, Co) yielded M3(dpmbhpp) 2 · 6py. The introduction of the R group at the methinic carbon lowers its reactivity.