Deoxygenative coupling

Deoxygenative Coupling of Carbonyl Compounds to Olefins McMurry Coupling... 

Density functional theory studies arene chromium tricarbonyls, 5, 255 beryllium monocyclopentadienyls, 2, 75 chromium carbonyls, 5, 228 in computational chemistry, 1, 663 Cp-amido titanium complexes, 4, 464—465 diiron carbonyl complexes, 6, 222 manganese carbonyls, 5, 763 molybdenum hexacarbonyl, 5, 392 and multiconfiguration techniques, 1, 649 neutral, cationic, anionic chromium carbonyls, 5, 203-204 nickel rj2-alkene complexes, 8, 134—135 palladium NHC complexes, 8, 234 Deoxygenative coupling, carbonyls to olefins, 11, 40 (+)-4,5-Deoxyneodolabelline, via ring-closing diene metathesis, 11, 219... 

Deoxygenative coupling of carbonyl compounds leading to substituted olefins is an important process in organic synthesis that can be promoted by low-valent... 

The utility of Sm in deoxygenative coupling of carbonyl compounds has already been discussed [38]. One study has been published on the reaction of acylphos-phonates with another lanthanide metal, Yb [46]. Ytterbium converted a substituted acylphosphonate under mild conditions (THF, HMPA, rt) to 1,2-diphenyl-2-oxoethyl phosphate and l-(phosphoryloxy)-l-phenylmethylphosphonate. The reactivity of Yb was explained in terms of its oxophilicity, leading initially to an acylytterbium complex. 

The reduction-deoxygenation coupling of aromatic amides in the presence of stoichiometric amount of organosi-lanes is catalyzed by Cp2TiX2 (X = F, Me).1249-1251... 

Deoxygenative Coupling of Ketones and Aldehydes by Low-Valent Lanthanides... 

Deoxygenative coupling of amides vic-diamines. This combination (1 2) can effect deoxygenative coupling of amides to form Wc-diaminoalkcncs. 

Deoxygenative coupling of carbonyl compounds to alkenes induced by low-valent titanium ... 

Several other methods for the synthesis of PPVs have been described in the literature. The McMurry reaction, which consists of the deoxygenative coupling of aromatic dialdehydes in the presence of titanium compounds, has been employed to obtain 2,5-dihexyl-PPVs [69], para- and meta-FFV (20) [70], Scheme 11, the latter very unlikely to be prepared by the Wessling-Zinmerman or electrochemical routes, since there is no possibility of forming the required quinodimethane intermediate. Nevertheless, a drawback of this method is the somewhat tedious workup needed for the isolation of insoluble PPVs from the elementary metal powder (Ti and/or Zn), which is also produced. 

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