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Metal Carbenes and Carbynes: The Taming of “Non-existing” Molecules

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Landmarks in Organo-Transition Metal Chemistry

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Notes

  1. 1.

    In English: “I think the ways by which people gain knowledge, are almost as wonderful as the nature of the things themselves.”

  2. 2.

    See [32], pp. 8–11.

  3. 3.

    At this point, the reader should be reminded that there are two systems of nomenclature for carbon–metal double and triple bonds. In contrast to Fischer, who named any unit of the general composition CR(R’) a carbene, and analogously any CR unit a carbyne, independent whether or not R and R’ contains a heteroatom such as oxygen, sulfur, nitrogen or chlorine [28–31, 43], Schrock later preferred the names alkylidene for CR(R’) and alkylidyne for CR, provided that R and R’ are either hydrogen, an alkyl, aryl or trimethylsilyl group. With regard to alkylidene he argued that a primary alkylidene CHR is derived from a primary alkyl ligand CH2R and a secondary alkylidene CR2 from a secondary alkyl ligand CHR2 [84]. Nevertheless, up to now both terms carbenes/alkylidenes and carbynes/alkylidynes occur as synonyms in the literature. In this monograph, the terms carbene and carbyne have been preferentially used.

  4. 4.

    It is interesting to note, that apart from the impressive series of transition metal complexes with monodentate NHCs, tetracarbene palladium(II) and platinum(II) as well as hexacarbene iron(III) complexes with bi- and tridentate chelating carbene ligands were prepared.

  5. 5.

    Editor’s page of Chemical & Engineering News, October 10, 2005.

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Werner, H. (2009). Metal Carbenes and Carbynes: The Taming of “Non-existing” Molecules. In: Landmarks in Organo-Transition Metal Chemistry. Profiles in Inorganic Chemistry. Springer, New York, NY. https://doi.org/10.1007/978-0-387-09848-7_8

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