1,721,203 research outputs found
Fragrances, drugs, agrochemicals and other fine chemicals by palladium catalyzed alkynes carbonylation
No full textUna banca dati sugli interventi conservativi dei Beni Culturali. L'attività della Federazione delle Società Chimiche Europee (F.E.C.S.). Part II – Scheda per la raccolta dati degli interventi conservativi su manufatti in pietra
No full textMetodolgia per la valutazione di prodotti impiegati come protettivi per materiale lapideo - Parte I - Tests e trattamento dei campioni
No full text
A methodological approach to the study of the deterioration of the statues in the Boboli's Garden (Pitti Palace - Florence). 3. Rapid determination of gypsum on marble by infrared spectroscopy
No full text
XVII Secolo- Cofano in Ambra. L'ambra di uno studiolo risalente agli inizi del XVII secolo: classificazione e considerazioni
No full textON THE MECHANISM OF THE PLATINUM(0)-ACID CATALYZED HYDROGENATION OF ALKENES
No full textThe hydrogenation of styrene promoted by the system [Pt(C2H4)(DPPB)]/acid is strongly affected by the nature of the solvent, the nature of the acid co-catalyst and the Pt/acid molar ratio. The highest catalytic activity is obtained in toluene working with methanesulfonic acid at a Pt/acid ratio = 1 The influence of the temperature and the hydrogen pressure on the catalytic activity has also been studied. The results indicate that at least two different catalytic systems operate. One of these accounts for the catalysis in the temperature range 25-35°C, while the other one is effective above 35°C. The catalytic activity of some model compounds has been also studied. 31P-NMR spectroscopy demonstrates that the complexes [Pt{CH(CH3)(C6H5)}(CH3SO3)(DPPB)] and [Pt(CH3SO3)2(DPPB)] are present in the low-temperature catalytic cycle. © 1994
Idroformilazione Asimmetrica di Stirene con Catalizzatori Contenenti Fosfine Atropoisomeriche
No full text- …
