ISSN:
0009-2940
Keywords:
Allenes
;
Manganese complexes
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Two products, Mn2(CO)7(PMe2Ph)[μ-η2-η2-MeO2C(H)CCC-(H)CO2Me] (1) in 9% yield and Mn2(CO)6(PMe2Ph)[μ-η3-η1-MeO2CC(H)CC(H)CO2Me] (2) in 34% yield, were obtained from the reaction of Mn2(CO)8(PMe2Ph)(MeCN) with MeO2C(H)C=C=C(H)CO2Me. Compound 1 contains a bridging η2-η2-MeO2C(H)CCC(H)CO2Me allene ligand and compound 2 contains a bridging η3-η1-MeO2C(H)CCC(H)-CO2Me allene ligand in which the oxygen atom of one of the carbonyl groups is also coordinated. Compound 1 slowly converts to 2, which establishes that it is a precursor to 2. Compound 2 reacts with NEtH2 to give the mononuclear manganese complex fac-Mn(CO)3(PMe2Ph)[MeO2CCH2-C=C(H)CO2Me] (3) in 96% yield. Compound 3 contains a chelating 1,3-di(methoxycarbonyl)propenyl grouping formed by addition of a hydrogen atom to the allene and the loss of a manganese grouping. Compounds 1-3 were characterized by single crystal x-ray diffraction methods.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19961291208
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