Now Erkkila and Pihko are quite concerned about reaction times because they are thinking of industry applications. However, for the average chemist that does a lot of work overnight (whilst at home in bed) it isn't essential that it's done in 1 hour. We found that if you do these reactions overnight no heating is required and the products are of very high purity. Very clean reactions indeed. Here's four examples from the paper:
As it turns out the chemistry works really well for most systems using catalyst 1. However, some aldehydes require catalyst 2 to give a good result, eg. entries 3 and 4. The only compounds tested in this paper that failed completely were aldehydes that exist predominantly in a hemiacetal form, eg. 5-hydroxy-valeraldehyde. So there you have it. Maybe something you should consider giving a go next time it's alpha-methylenation time. D!