Thanks your videos are so helpful!! I like that the playlist for organic chemistry is in order of how I'm actually learning it so far so that's mega useful too!!
Hm...it seems as though you should have explained that although catalytic hydrogenation is stereospecific in the sense that the addition always occurs in a syn fashion, the syn addition can still occur on either face of the molecule and thus produce a mixture of enantiomers. Of course, in this case, a meso compound is formed and that discussion is irrelevant, but that's not always true.
Professor Dave Explains Your videos are really straightforward, clear, and useful by the way! So please don't take my first comment as a heavy criticism. It was just a thought I had while watching it.
Actually I read in a book which stated that, ' Attack of nucleophile is a fast step so every present nucleophile will attack on Carbocation that means nucleophilic attack is quantitative not qualitative' What does this mean??
I had already commented in other video... Sorry haha but this is the right one I guess. Teacher please help me: when you have ethene and chlorine reacting occours and electrophilic addition. Why? Is there any video explanning this kind of reaction? I thought that would happen a homolytic addition, but no. Im from Brazil and in RU-vid I didnt find any video explanning this in my language so im trying to search in other languages. Could you help me please?
when there is a tetrahedral geometry , is there is a specific rule that I can follow in order to know in what direction is each projecting group (wedge \dash)?
wedge is coming at you, dash is pointing away. if the catalyst is a solid, that is heterogeneous catalysis, since its a different phase than the reactant which is in solution.
so every addition reaction has its own mechanism, so it's a case by case basis. something like a dihalogenation is an anti addition because the second step is an SN2. but in general there is no telling which side of a planar molecule a nucleophile will attack from, that's why there tends to be multiple stereoisomeric products.
well i pepper in that kind of analysis all through this series, but in general sterics discourage nucleophiles from approaching bulky portions of a substrate, and that's a kinetic effect, whereas electronics are more of a thermodynamic effect, because they tend to dictate what product has the lowest energy. i think i talk more about this in my zaitsev vs. hoffman clip.
if the example you gave was a Syn addition reaction, how do we know when it could be anti? I understand you added H2 and the methyl group shifted to become dashes (away from you) but what happens when one is dashed and one is wedged? Does it depends on the substituents being added?
it depends on the reaction mechanism. some additions are always syn, some are always anti. keep going through the series and you'll see more examples of both!
