pH-Selective Hydrogenation of Water-Soluble Carbonyl Compounds and Alkenes with [Cp*IrIII(H2O)3]2+(Cp* =η5-C5Me5) as a Catalyst Precursor in Very Acidic Media

2001 ◽  
Vol 20 (3) ◽  
pp. 497-500 ◽  
Author(s):  
Nobuyuki Makihara ◽  
Seiji Ogo ◽  
Yoshihito Watanabe
Keyword(s):  
Selective Hydrogenation ◽  
Carbonyl Compounds ◽  
Water Soluble ◽  
Catalyst Precursor ◽  
Acidic Media

Visible photostability of some ruthenium and platinum phthalocyanines in water and in the presence of organic substrates

2010 ◽  
Vol 14 (06) ◽  
pp. 499-508 ◽  
Author(s):  
Manuela Carchesio ◽  
Lucia Tonucci ◽  
Nicola d'Alessandro ◽  
Antonino Morvillo ◽  
Piero Del Boccio ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Carbonyl Compounds ◽  
Furfuryl Alcohol ◽  
Phenylacetic Acid ◽  
Water Soluble ◽  
Light Irradiation ◽  
Organic Substrates ◽  
Visible Spectra ◽  
Trapping Agent

Water-soluble, metal-tetrasubstituted phthalocyanines ( -SO3H , MPcS and -COOH , MPcC) of platinum and ruthenium were synthesized and their photostability to visible light irradiation was determined. For the ruthenium phthalocyanines, the characteristic visible Q band of the phthalocyanines was almost totally suppressed after five days of irradiation. The platinum derivatives were instead more resistant to photodegradation, and the Q band did not decrease by more than 25%. The addition of carbonyl compounds to the phthalocyanine solution in water (at concentrations at least 1400-fold those of the phthalocyanines) dramatically accelerated the photobleaching of these phthalocyanine complexes. PtPcS turned from blue to green and to colorless with one day of visible-light irradiation in the presence of acetone. This effect decreased with the increase in molecular weight of the ketones (from acetone to 2-pentanone). The addition of alcohols (i.e. 1-butanol) or other organics (i.e. phenylacetic acid) did not affect the photostability of these metal-tetrasubstituted phthalocyanines. Dioxygen also had an important role, as when the solutions of phthalocyanines were carefully deaerated before irradiation, the visible spectra were preserved. The platinum phthalocyanines, as with the palladium analogs, sensitize the photoproduction of 1O2 , as shown by the formation of endoperoxide and its rearranged products in the presence of furfuryl alcohol (a singlet oxygen trapping agent).

Selective hydrogenation of α,β-unsaturated carbonyl compounds on silica-supported copper nanoparticles

2019 ◽  
Vol 55 (2) ◽  
pp. 179-181 ◽  
Author(s):  
Jorge Mendes-Burak ◽  
Behnaz Ghaffari ◽  
Christophe Copéret
Keyword(s):  
Organometallic Chemistry ◽  
Copper Nanoparticles ◽  
Selective Hydrogenation ◽  
Carbonyl Compounds ◽  
Highly Efficient ◽  
Surface Organometallic Chemistry

Silica-supported copper nanoparticles prepared via surface organometallic chemistry are highly efficient for the selective hydrogenation of various α,β-unsaturated carbonyl compounds yielding the corresponding saturated esters, ketones, and aldehydes in the absence of additives.

scholarly journals Selective Hydrogenation of Unsaturated Carbonyl Compounds

1966 ◽  
Vol 24 (1) ◽  
pp. 54-59 ◽  
Author(s):  
Kazuo YAMAGISHI ◽  
Shinpei HAMADA ◽  
Hideo ARAI ◽  
Hiroshi YOKOO
Keyword(s):  
Selective Hydrogenation ◽  
Carbonyl Compounds
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