The Wittig reaction is the reaction of a Wittig reagent with an aldehyde or a ketone to afford an alkene as the organic product.

eg:

Mechanism:

OCHEMPAL IS NOW IN THE FORM OF A BOOK

Title: The Elements of Organic Chemistry; Subtitle: A Compendium of Terminology, Definitions, and Concepts for the Beginner.

Available at  Amazon or the publisher’s website: http://linusbooks.com/?wpsc-product=the-elements-of-organic-chemistry

 The book contains everything on OChemPal except some recent additions, a few biochemical terms, and the Mastery Check feature. So, if you prefer reading a book to reading a screen, the book is for you