| Abstract
| - CO-promoted sulfuration with elemental sulfur and selenylation with elemental selenium of Fischerbiscarbene complexes of chromium have been achieved by means of in-situ-generated SCO and SeCO,efficiently affording thio- and selenocarboxylates. Intramolecular reactivity inversion of the chromiumcarbene carbon bonds (CrC) in an alkoxy−alkoxy biscarbene complex was realized by replacement ofthe alkoxy group bonded to the more reactive CrC carbon atom with an amino moiety. A strainedcyclobutenyl ring activates the aminocarbene carbon bond, which thus undergoes oxidation, sulfuration,and selenylation under mild conditions. Demetalation of alkynyl, alkenyl, and alkyl Fischer monocarbenecomplexes was also investigated by the same method, from which selenium- or sulfur-insertion complexesand seleno- and thiocarboxylates were obtained.
- CO-promoted sulfuration with elemental sulfur and selenylation with elemental selenium of Fischer biscarbene complexes of chromium have been achieved by means of in-situ-generated SCO and SeCO, efficiently affording thio- and selenocarboxylates under controlled mild conditions. Demetalation of alkynyl, alkenyl, and alkyl Fischer monocarbene complexes was also investigated by the same method.
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