The addition (4 + 2) of cyclopropenes derived, by photolisis, from pyrazolenines having in position C4 and C5 electroattractive substitutes, is easily achieved on dienes-1,3. They are concerted reactions which are sensitive to steric effects; the Diels-Alder products obtained in this way therefore present a great stereoselectivity.
A. Khemiss, M. Franck-Neumann
Benzylideneamines have been synthesised from aromatic aldehydes and various amines, and tested for their antifungal properties. I.R.1H and 13C RMN studies established the non planar conformation of the benzylideneaniline type molecules.
C. Catusse, R. Catusse, A. Gaset, J.P. Gorrichon
Action of N-Acyl and N-ethoxycarbonyl imidates with diaminoimidates gave purinic derivatives with good yields.
A. Hajjem, M.T. Kaddachi, B. Saccar
Treatment of N-acyl, N-ethoxycarbonyl and N-cyanid imidates with organomagnesium compounds, gave amides and amines with good yields.
M.L. El Efrit, B. Hajjem, B. Baccar
The LiAIH4 action on myrtanolepoxide 3a, myrtanolepoxidemethyle 3b and myrtanolepoxidedimethyle 3c in amine-triethyle, allows respectively the formation of (7a + 8a) and (7b + 8b) and β-ketol 12.
M.M. El Gaied, A. Selmi
Perchloric acid solutions (from 0 to 10 M) were added into nitric aqueous solutions (0-3 M) of uranyl nitrate (roughly 0,1 M). Then Uranium was extracted by 30% TBP in CCl4. These additions yield to a very large increase of the distribution coefficient for uranium. HClO4 "synergic effect" on the extraction of uranium is discussed on the basis of the study of the uranyl ion behaviour in the nitro-perchloric aqueous medium.
By using a 23 factorial design, we have determined the effect of three variables on both the amount of magnesium precipitation in phosphoric acid and the amount of P2O5 losses. While NH4+ appeared to control the form of magnesium precipitate, Al3- and F- appeared to have the greatest effect on the amount of magnesium precipitation.
M. Feki, M, Chaabouni, H.F. Ayedi
We have prepared a cadmiocalcium OH Ap by heating the equimolar mixture of cadmium carbonate and apatitic tricalcium orthophosphate at different temperatures. Then the mixture was analysed by X-Ray, IR and TGA. Results showed that the structure and stability of the obtained cadminocalcium OH Ap depend on the preparation atmosphere.
M. Farhat, A. Hamad, S. Chemlal