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Why is HS- a stronger nucleophile than H3CS-? I would think the H3C would act as an EDG and therefore push electron density onto the S, therefore making it more able to give up electrons as a nucleophile
Why is HS- a stronger nucleophile than H3CS-? I would think the H3C would act as an EDG and therefore push electron density onto the S, therefore making it more able to give up electrons as a nucleophile
The strength of a nucleophile determines how fast it would react. So the stronger the nucleophile, the faster it would react in a reaction. The reason why HS- is a stronger nucleophile is because it experiences less of a steric hindrance than H3CS- (react faster).
What is incorrect about seeing the methyl group as an EDG that would increase available electrons for S donate?
Thank you, that seems pretty detailed. So what allows you to determine that the steric hindrance effect is greater? Is that something I should know? I may have to look up hyperconjugation to try and understand thisNothing particularly wrong but it's a weak effect. To see that, you have to understand how the methyl group pushes electron density, aka hyperconjugation. So the methyl carbon usually donates electron density via an MO pushing towards an empty p orbital of the adjacent atom. With carbon and sulfur, the sulfur p orbital is one energy level higher than the carbon orbitals and thus the overlap is not too good. So you wouldn't expect much delocalization via hyperconjugation here.
What is incorrect about seeing the methyl group as an EDG that would increase available electrons for S donate?
It's wrong because the methyl group is not donating anything to S. Answer this: what makes methyl an "electron donating group?"
That aside, -SH is a better nucleophile due to the same reason that -OH is a better nucleophile than an ether.
I initially thought, as aldol mentioned above, that through hyperconjugation, CH3 pushes electron density onto the SHBut why? Why don't you question that but question that fact the -SH is a better nucleophile?
Electron donating to what?
It's wrong because the methyl group is not donating anything to S. Answer this: what makes methyl an "electron donating group?"
I initially thought, as aldol mentioned above, that through hyperconjugation, CH3 pushes electron density onto the SH