The difluoromethylidene ligand, (M)=CF2, represents an intermediate between the Fischer carbene and Schrock carbene extremes. Account for the observation that the depicted complex C reacts rapidly at the carbenoid C with nucleophiles (Nu) and is completely unreactive towards electrophiles (E¹), while the complex D reacts at the same site rapidly with E but only slowly with Nu. CI CI PPh3 Ru PPh3 с CO :CF2 PPh3 OC. + Ru: CF2 OC PPh3 D

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The difluoromethylidene ligand, (M)=CF2, represents an intermediate between the
Fischer carbene and Schrock carbene extremes. Account for the observation that the depicted
complex C reacts rapidly at the carbenoid C with nucleophiles (Nu) and is completely
unreactive towards electrophiles (E¹), while the complex D reacts at the same site rapidly
with E* but only slowly with Nu
PPh3
CO
£
CI
Ru :CF₂
CI
PPh3
C
OC
OC
PPh3
Ru
PPh3
D
CF₂
Transcribed Image Text:The difluoromethylidene ligand, (M)=CF2, represents an intermediate between the Fischer carbene and Schrock carbene extremes. Account for the observation that the depicted complex C reacts rapidly at the carbenoid C with nucleophiles (Nu) and is completely unreactive towards electrophiles (E¹), while the complex D reacts at the same site rapidly with E* but only slowly with Nu PPh3 CO £ CI Ru :CF₂ CI PPh3 C OC OC PPh3 Ru PPh3 D CF₂
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