I'd like to clarify my thoughts on the matter. I don't think that
most companies like Flavor West are actually manufacturing by mixing individually sourced, pure chemicals. That is a difficult and expensive endeavor, that would seem to be above such a company's 'pay grade'. I think that they manufacture blends of other pre-made blends of chemicals from flavor companies that are higher up the chain, such as these:
Flavor & Fragrance Industry - Top 10
Category:Flavor companies - Wikipedia, the free encyclopedia
I admit that I could be wrong, but it's hard to say, as secrecy is highly prized in such an industry. If they are using such 'flavors' from bigger companies, then they may not know what, exactly, is in their own flavor blends, as that is proprietary information protected by the business that is supplying them.
I've found a couple of the articles that have intrigued me in the past, about this subject. They both have interesting tidbits about this higher echelon of the industry:
How Flavor Chemists Make Your Food So Addictively Good
The Flavorists: Tweaking tastes and creating cravings - CBS News
It makes perfect sense to me that most smaller flavoring companies probably do not engineer their flavors absolutely from scratch, as that would essentially be reinventing the wheel. They probably source simple flavors from bigger companies who have already done the R&D, and put their own spin on them by blending different ones together. If so, then these 'raw materials' would actually be mixtures of dozens of chemicals, and protected as intellectual property.
They will probably never tell, though, so I suppose that it's our lot to speculate, and poke them with sticks when we get angry, in the hopes that they may spout out a truth, accidentally.
Just to add another nugget of diacetyl-related info, it appears that one of these top flavoring companies had some grief over allegations of poor handling of the huge amounts that they use:
Sensient Technologies - Wikipedia, the free encyclopedia
Ugh.