Organo cerium

Alkylations of epoxychalcones 2 has been successfully effected using organo-cerium reagents, displaying excellent yields (80-91 %) and moderate diastereo-selectivities (4 1 - 9 1) of the resultant tertiary alcohols, (Scheme 12). 

Reviews of carbanionic reactions in synthesis have addressed the use of organo-cerium compounds and ketone formation by reactions of acyl chlorides with organometallic reagents. ... 

Boussie, T.R., Eisenberg, D.C., Rigsbee, J. et al. (1991) Structures of organo-f-element compounds differing in the oxidation state of the central metal crystal structures of bis([8]annulene) complexes of cerium(lV), ytterbium(III), and uranium(III). Organometallics, 10, 1922. 

Organolanthanide(III) compounds form the bulk of all the known organo-lanthanides. However, in addition to the + 3 oxidation state, the + 2 oxidation state is chemically accessible for samarium, europium and ytterbium (an organocerium(II) [1] and an organoneodynium(II) [2] complex have also been reported but not structurally confirmed) and the +4 oxidation state is accessible for cerium. A few organolanthanide(O) compounds are also known,... 

The chemoselectivity between aldehydes and ketones has been studied by Kauffinann et al Cerium reagents exhibit moderate aldehyde selectivities, although these are much lower than those of the organo-metallic reagents of titanium, zirconium and chrmnium (Scheme 2). ... 

USE OF CERIUM(III) CHLORIDE IN THE REACTIONS OF CARBONYL COMPOUNDS WITH ORGANO-LITHIUMS OR GRIGNARD REAGENTS FOR THE SUPPRESSION OF ABNORMAL REACTIONS 1-BUTYL-1,2,3,4-TETRAHYDRO-1 -NAPHTHOL... 

Cerium compds., organo- (s.a. Cerates) Cerium(III) halides, organo-... 

PO can be made degradable by means of additives. The types of additives include aromatic ketones (benzo-phenone and substituted benzophenones [47], qui-none), aromatic amines (trisphenylamine), polycyclic aromatic hydrocarbons (anthracene, certain dyes such as xanthene dyes), or transition metal organic compounds. The transition metal compounds of Fe, Co, Ni, Cr, Mn are widely used. Organo-soluble acetyl acetonates of many transition metals are photooxidants and transition metal carboxylates are also thermal pro-oxidants. Co acetylacetonate appears to be an effective catalyst for chemical degradation of PP in the marine environment. The preferred photoactivator system is ferric dibutyldithiocarbamate with a concentration range of 0.01. 1%. Scott has patented the use of organometallic compounds hke iron (ferric) dibutyldithiocarbamate or Ni-dibutyl-dithiocarbamate [48]. Cerium carboxylate [49] and carbon black are also used in such materials [50]. 

Ho, D., Corrosion Inhibition Effectiveness of Green Cerinm-organo Compounds Cerium Salicylate and Cerium Di-butyl Phosphate on AA2024 T3 in Both Aqueous and Epoxy Coating Environments, in Materials Engineering. 2007, Monash University Melbourne. 

SOMO catalysis, which has been the subject of considerable attention in recent years, is a unique and versatile activation mode that can participate in bond construction with various n-rich nucleophiles. The first asymmetric intramolecular a-arylation of aldehydes was reported by Nicolaou in 2009 using organo-SOMO catalysis [17a]. The authors applied imidazolidinone 23 as catalyst and cerium ammonium nitrate (CAN) as the oxidant Various 5-oxopentylbenzenes 36, or indole derivatives 38, could furnish the cyclic products 37 or 39, respectively, in good yields and with excellent ees (Scheme 36.11). Later, MacMillan disclosed similar research [17b], and a theoretical study of the intramolecular a-arylation of aldehydes was also reported by the same group via density functional theory [17c],... 

D. Ho, K. M. Nairn, A. J. Hill, J. R. Scully, B. R. W. Hinton and M. Forsyth, Release of cerium organo corrosion inhibitors from primers - role of primer free volume , in Corrosion and Prevention, 71. Australasian Corrosion Association, Sydney, November 2007. 

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