What part of the brain is important for chemists?

It would be the cerebral cortex and the left hemisphere.More specifically the parietal and frontal portions.

(Neurotransmitters and synapses are the mechanisms by which a brain works, they are not regions of the brain but found throughout the brain).

(Hormonal production in the hypothalamus have nothing to do with ability to apply logic and structure)

I would think language processing might be a factor as well. I was always a very strong math student. I did well in philosophy and formal logic courses, but I struggled more with chemistry due, in part, with keeping all of the suffixes straight. I also struggled with foreign language, so I think there’s a language processing component to the neurology that is needed in addition to logic and reasoning.

I would be surprised if a complex discipline like chemistry has a specific “part” of the brain. I may be mistaken, but I thought the different “parts” of the brain had more specific roles, which we then coordinate in various ways to be able to do more complex things.

I expect the most important part of the brain for learning chemistry (or any discipline/skill) is the brain’s neuroplasticity—our ability to learn new things.

Generally speaking, the more broadly you engage your brain in learning something new, the better you learn that thing in the long run.

I’m taking a guess here (may be wrong), but: assuming you know mathematics and physics well, and are currently learning chemistry, finding conceptual connections/comparisons between chemistry and those other disciplines could be a good way for you to approach learning chemistry. I would imagine there are many conceptual connections/comparisions to be found, and you would be using your pre-existing “schema” for each math and physics to strengthen your learning of chemistry (and potentially of math and physics as well).