Z MX Z Y O MC O R C O O MS O R O Ssulphinate iminoacyl acyl Migratory insertion of CO general reaction of MC bonds important in the ID: 297563
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1 Insertion / Deinsertion 1,1-insertion / deinsertion because both M and Y end up bound to the atom in position 1 (XSpecific examples: YM Z MX Z Y O MC O R C O O MS O R O S-sulphinate iminoacyl acyl Migratory insertion of CO general reaction of M-C bonds important in the Oxo hydroformylation process and the Monsanto acetic acid process (next section) The classic example: C C C O O O O O PMePMe C C C C O O O O C C C O O O O O C C C C C O O O O O vacuumSuggests that direct CO insertion from the gas phase is NOT involved 1,2-insertion / deinsertion because M ends up bound to the atom in position 1 (X) while Y ends up bound to the atom in position 2 (Z Alkene and alkyne insertion into M-H (or M-C) bonds X Z Y M H M H 18 e- agostic 16 e-M H M H a vinyl complex M-H 60 kcal/molM-C 35 kcal/mol-C=C 64 C-H 98 H bond, do not eliminate rapidly: C R R R R rel. eliminationrate polymerization of alkenes ( R R RCH=CH RCH=CH repeat high polymer Recognized as a major class of reaction for metal-alkyls in cases of doing oxidative-addition/reductive elimination sequences: metals (Sc and some p-block metals, especially but not believed to be very important with late transition metals that can do redox chemistry