Cr acetylacetonate

Gelled Liquid Nitroporaffins, such ad Nitro-methane, cofttg 5—75% NG, some amine and up to 3% of Cr acetylacetonate, may be used as an expl or a propellant, The gels are liquid if small amts of NC are used, and solid if the amts are high Refs H. Maisner, USP 2690964(1954) ... 

NC is sensitized by the addn of some amine. Cr acetylacetonate may be incorporated to obtain easier ignition) k)L.R.Rapp M.P-Strier, Jet Propulsion 27, 401-4(1957) (A... 

It is claimed that Cr acetylacetonate improves the ignition of nirroparaffin gels(Ref 3)... 

List of Chromium Compounds Chromium Acetylacetonate or Chromylacetyl-aeetone. See Vol 1, pA53-R Addnl Ref F.Bellinger et al, IEC 40, 1330 (1948) C.A42, 6115 (1948) [it was found that Cr acetylacetonate added in quantities of about 2% (together with 4% of gasoline) to nitromethane, prevented its detonarion when used a rocket ptcplnt such as for launching a buzz bomb]... 

MP 32,305-7(1950) (Phenyl-/3-naphthylamine as a stabilizer for smokeless propellants) 3a)Degering(1950),199-221 292-321 4)11. Maisner, USP 2, 712,989(1955) CA 49,14325-6(1955) (An organic amine was proposed as an addn to nitroparaffin-gel rocket propellants to make them expl, eg, a rocket propellant consisting of MeNO, blended with 10-50% NC and contg Cr acetylacetonate up to 3% by wi became an expl after incorporating some amin ... 

FIGURE 48 Silica hydrogel before the drying step. Above Spherical gelled silica beads (75% water) Below Silica hydrogel containing Cr(acetylacetonate)3 on left and... 

Unfortunately, integration of carbon spectra is rarely reliable, in part because of the wide range of relaxation times encountered. Relaxation times of carbonyls and other carbons lacking proton substituents are especially long. This means that the nuclei are easily saturated and intensities are low sometimes a paramagnetic complex, such as Cr(acetylacetonate)3, is added to help relax these carbons. 

The first example dealing with the use of paramagnetic species to shorten the relaxation time of the solvent nuclei deals with the very first detection of the NMR phenomenon, as Bloch used iron(III) nitrate to avoid saturation of the water proton signal. Then in the 1970s it was rather common, in organic and orga-nometallic chemistry, to add to the substrate solution a reagent such as Cr(acetylacetonate)3 (Cr(acac)3) or Fe(acac)3 in order to shorten the Tj of and res-... 

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