Reaction of cyclomanganated aryl ketones with CS 2 proceeds with insertion into the Mn-C bond to

SynopsisPhCH 2 Mn(CO) 5 reacts with 1,4-di-aryl-1-aza-1,3-butadienes in the presence of unsaturated substrates to give products based on a cyclomanganated intermediate.PhCH 2 Mn(CO) 5PhC CH PhNCO CH 2 =CHCOOMe CO 2 Abstract.Reaction of PhCH 2 Mn(CO) 5 with 1,4-di-aryl-1-aza-1,3-butadienes gave substituted pyrrolinonyl rings which were 4 -coordinated to a Mn(CO) 3 group. These are formed by intramolecular CO insertion into a (non-isolated) cyclomanganated intermediate, followed by cyclisation. Other unsaturated reagents (PhC>CH, CH 2 =CHCOOMe, PhNCO) gave products arising from insertion of these, including a structurally characterised tri-aryl-5 -azacyclohexadienyl-Mn(CO) 3 complex from the reaction with the alkyne.

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