It exhibits carbenoid behavior after the addition of a catalytic amout of pyridine.

mechanism:

remarks:

• The Tebbe's reagent transfers a methylene group (CH2) efficiently to various carbonyl compounds to afford olefins.
  
• See also: Petasis olefination
  

references:

J. Org. Chem. 2006, 71, 5457.
J. Am. Chem. Soc. 1997, 119, 7483.
J. Am. Chem. Soc. 1993, 115, 10400.
J. Org. Chem. 1985, 50, 1212.
J. Am. Chem. Soc. 1978, 100, 3611.