Kowalski ester homologation

The Kowalski ester homologation is a chemical reaction for the homologation of esters.

[1][2] This reaction was designed as a safer alternative to the Arndt–Eistert synthesis, avoiding the need for diazomethane.

The Kowalski reaction is named after its inventor, Conrad J. Kowalski.

The mechanism is disputed.

[further explanation needed] By changing the reagent in the second step of the reaction, the Kowalski ester homologation can also be used for the preparation of silyl ynol ethers.