THE ORGANOMETALLIC CHEMISTRY OF CARBON SUBOXIDE

Carbon suboxide, C3O2, reacts with a great variety of organometallic compounds, yielding, with organosilicon and organoaluminum, sililation and carboalumination products, respectively. Insertion reactions of C=C are performed with compounds having M-H, M-OR, M-NR2, M-PR2 bonds, giving mono-meta derivatives (ketenyl) or di-metal derivatives. Ketenyl, ketenylidene and carbonyl complexes are also obtained

Synthesis of a pyrone derivative from carbon suboxide and acetylacetone catalyzed by acetylacetonate-metal complexes.

Bis(pentane-2,4-dionate)-metal, M(acac)2, (where M = Zn, Co, Ni and Cu) reacts quickly and in high yield with carbon suboxide, C3O2, at the methine position. The reaction produces 1:2 adducts which are insoluble in all organic solvents. The reaction of these adducts with aqueous HCl forms 5-acetyl-2-hydroxy-6-methyl-4-pyrone (AHMP). The above-mentioned metal-acetylacetonates also catalyze the addition of C3O2 to free Hacac, but Cr(acac)3, Fe(acac)3 and Mn(acac)3 do not. The relative catalytic efficiency of these pentane-2,4-dionates was determined. A mechanism for these reactions is proposed

MAGNETIC TREATMENT OF WATER AND SCALING DEPOSIT

A series of experiments confirms that a suitable magnetic field is able to prevent scale deposit on water contining Ca+2 ions and carbonic species. The magnetic field acts inducing the precipitation of CaCO3 in crystalline form, (calcite or aragonite) that does not adhere to the walls and tubes, whereas amorphous CaCO3, which is formed in absence of the magnetic field, is responsible of the scale deposit. The nucleating effect of Fe ions on the formation of crystalline CaCO3, in the presence of the magnetic field, is discussed

THE CRYSTAL-STRUCTURE OF PT(II)-TRANS-[(BIS-TRICYCLOHEXYLPHOSPHINE)-(ETA-1-HYDRO-FORMYL-TER-BUTYL AMIDO)(HYDRIDE)]

The title compound, C43H79O2NPt, crystallizes in the monoclinic system, space group P2(1)/c, with a = 20.444(8) angstrom, b = 12.220(4) angstrom, c = 18.303(7) angstrom, beta = 101.6(4), Z = 4. The coordination of Pt is slightly distorted square-planar, the backbone of the hydro-aldoamidic ligand is almost planar; its mean plane is orthogonal to the coordination plane of Pt. The crystal structure has been refined to R = 0.054 for 3518 observed reflections