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Is this Weigeltisaurus reptile in this family Rhynchocephalia. Would that statement be true to say. Its for this article Johannes Weigelt. There is source that states it but I don't know how accurate it is. scope_creep Talk 21:23, 9 June 2024 (UTC)
The reaction between a Grignard reagent () and an alkyl halide () gives what product? I see some sources saying there would be substitution reaction thus forming , whereas other source says there would be transmetallation thus forming . Thanks for your time, ExclusiveEditor Notify Me! 12:19, 12 June 2024 (UTC)
@ Vanadium-3065, Michael D. Turnbull, and 2402:800:639D:9B0A:C9C4:BA57:2B8:DC89: To clarify, I am not an advanced chemistry student, so I don't realize things which really require deep insights. However one thing I would mention is that the statement that R-R' would not be formed but transmetallation would happen is written in Clayden [1] (available at pg 189 at pdfs available online.). Maybe this would help clear any confusion, or if the publisher should be informed that the strict language that R-R' would not be formed is wrong. Reply appreciated, ExclusiveEditor Notify Me! 16:13, 21 June 2024 (UTC)
So I think my question could be summarized as, what product do we get, if we conducted Kumada coupling without any catalyst, and the answer supposedly is that we get transmetalation (or metal–halogen exchange as said by DMacks) per Clayden. It is only if we use some transition metal like Ni/Pd as catalyst, that we get a carbon-carbon bond (R-R'). ExclusiveEditor Notify Me! 18:41, 21 June 2024 (UTC)
even if the coupling were successful, three coupled products will be formedas if it were the main reason not to try the reaction R1CH2MgBr + R2CH2Br -> R1CH2CH2R2 (i.e. because you would also get R1CH2CH2R1 and R2CH2CH2R2) whereas in fact the main reason this sort of coupling is unsuccessful is that the rate of any useful reaction is too low. Mike Turnbull ( talk) 11:16, 22 June 2024 (UTC)
http://doi.org/10.1007/978-94-017-9861-7_22
Does anyone have access to this? If so, does it make any reference to the diet or hunting behaviour of Euthyrhynchus floridanus? Such claims were added without reference to this insect's article four years ago ( [1]), and later someone dumped in a reference to this book. Nyttend ( talk) 21:15, 12 June 2024 (UTC)
Science desk | ||
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< June 11 | << May | June | Jul >> | June 13 > |
Welcome to the Wikipedia Science Reference Desk Archives |
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The page you are currently viewing is a transcluded archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
Is this Weigeltisaurus reptile in this family Rhynchocephalia. Would that statement be true to say. Its for this article Johannes Weigelt. There is source that states it but I don't know how accurate it is. scope_creep Talk 21:23, 9 June 2024 (UTC)
The reaction between a Grignard reagent () and an alkyl halide () gives what product? I see some sources saying there would be substitution reaction thus forming , whereas other source says there would be transmetallation thus forming . Thanks for your time, ExclusiveEditor Notify Me! 12:19, 12 June 2024 (UTC)
@ Vanadium-3065, Michael D. Turnbull, and 2402:800:639D:9B0A:C9C4:BA57:2B8:DC89: To clarify, I am not an advanced chemistry student, so I don't realize things which really require deep insights. However one thing I would mention is that the statement that R-R' would not be formed but transmetallation would happen is written in Clayden [1] (available at pg 189 at pdfs available online.). Maybe this would help clear any confusion, or if the publisher should be informed that the strict language that R-R' would not be formed is wrong. Reply appreciated, ExclusiveEditor Notify Me! 16:13, 21 June 2024 (UTC)
So I think my question could be summarized as, what product do we get, if we conducted Kumada coupling without any catalyst, and the answer supposedly is that we get transmetalation (or metal–halogen exchange as said by DMacks) per Clayden. It is only if we use some transition metal like Ni/Pd as catalyst, that we get a carbon-carbon bond (R-R'). ExclusiveEditor Notify Me! 18:41, 21 June 2024 (UTC)
even if the coupling were successful, three coupled products will be formedas if it were the main reason not to try the reaction R1CH2MgBr + R2CH2Br -> R1CH2CH2R2 (i.e. because you would also get R1CH2CH2R1 and R2CH2CH2R2) whereas in fact the main reason this sort of coupling is unsuccessful is that the rate of any useful reaction is too low. Mike Turnbull ( talk) 11:16, 22 June 2024 (UTC)
http://doi.org/10.1007/978-94-017-9861-7_22
Does anyone have access to this? If so, does it make any reference to the diet or hunting behaviour of Euthyrhynchus floridanus? Such claims were added without reference to this insect's article four years ago ( [1]), and later someone dumped in a reference to this book. Nyttend ( talk) 21:15, 12 June 2024 (UTC)