I am going to teach the Wittig in my review session, and I think it is worth mentioning the Tebbe's reagent, and its synthetic utility when one has a sterically hindered carboxylic acid derivative such an amide or ester groups. Never run the reaction myself, but the professor of their class said any alternative synthesis with reagents not spoken about in the lecture is grounds for bonus points. Just so I do not teach it to them wrong, I understand the reaction to proceed in pyridine? Any other points would be greatly appreciated. I have already done a literature review, and it seems like a pretty kick-arse little trick for methyleneation of an otherwise "deactivated" carbon.