It's a beauty, isn't it? I mean, look at that monster! And it packs 4 palladium atoms per catalyst too. It just appeared in Organometallics (DOI: 10.1021/om7005613). They actually coupled together iodobenzene and styrene. The cool thing about this is that they could tune the reactivity of the catalyst by changing the metal complexed in the middle of the porphyrin. With M=MnCl it took almost 400 minutes for the reaction to complete, but with M=Mg it only took about 200 minutes. Ok, seriously. I don't mean to pick on Bart M. J. M. Suijkerbuijk, Sara D. Herreras Martínez, Gerard van Koten, and Robertus J. M. Klein Gebbink, but I really don't understand what the purpose of this research is. I guess you can get some understanding about the electronic nature of pincer ligands, but no one in their right mind would ever use something like this for a Heck reaction. It is pretty though. It even weighs 10 times more than your substrate. I guess that makes for easy weighing. Let's say you use 10 mol% of the catalyst. You can just use the same mass as iodobenzene and you're good to go.
Showing posts with label Palladium. Show all posts
Showing posts with label Palladium. Show all posts
Monday, February 4, 2008
A new precatalyst for Heck Reactions
It's a beauty, isn't it? I mean, look at that monster! And it packs 4 palladium atoms per catalyst too. It just appeared in Organometallics (DOI: 10.1021/om7005613). They actually coupled together iodobenzene and styrene. The cool thing about this is that they could tune the reactivity of the catalyst by changing the metal complexed in the middle of the porphyrin. With M=MnCl it took almost 400 minutes for the reaction to complete, but with M=Mg it only took about 200 minutes. Ok, seriously. I don't mean to pick on Bart M. J. M. Suijkerbuijk, Sara D. Herreras Martínez, Gerard van Koten, and Robertus J. M. Klein Gebbink, but I really don't understand what the purpose of this research is. I guess you can get some understanding about the electronic nature of pincer ligands, but no one in their right mind would ever use something like this for a Heck reaction. It is pretty though. It even weighs 10 times more than your substrate. I guess that makes for easy weighing. Let's say you use 10 mol% of the catalyst. You can just use the same mass as iodobenzene and you're good to go.
Thursday, October 4, 2007
Tetrakis Talk
{greg the chemist dialing the phone}
{ring}
AA: "Hello, this is Gregory from Alfa Aesar Technical Assistance. May I help you?"
GTC: "Yes, Hi. We have just received our order for 2 g of palladium tetrakis triphenylphospine. The shipment we received is sealed in an ampule but has a dark green color. Can we replace it with some good catalyst?"
AA: "Well, our palladium tetrakis comes in three different colors; yellow, green and brown."
GTC: "But this should be bright yellow."
AA: "We have analyzed our product and chemically it is the same. It should work fine for you."
GTC: "Palladium Tetrakis should be bright yellow."
AA: "I can see that you don't want our product. I will issue a refund and you can send it back to us."
GTC: "Um. Great. Thank you very much."
{click}
GTC: "What the hell? Three different colors? No thanks. Why didn't we order from Strem in the first place?"
{sorry for the poor photos}
{ring}
AA: "Hello, this is Gregory from Alfa Aesar Technical Assistance. May I help you?"
GTC: "Yes, Hi. We have just received our order for 2 g of palladium tetrakis triphenylphospine. The shipment we received is sealed in an ampule but has a dark green color. Can we replace it with some good catalyst?"
AA: "Well, our palladium tetrakis comes in three different colors; yellow, green and brown."
GTC: "But this should be bright yellow."
AA: "We have analyzed our product and chemically it is the same. It should work fine for you."
GTC: "Palladium Tetrakis should be bright yellow."
AA: "I can see that you don't want our product. I will issue a refund and you can send it back to us."
GTC: "Um. Great. Thank you very much."
{click}
GTC: "What the hell? Three different colors? No thanks. Why didn't we order from Strem in the first place?"
{sorry for the poor photos}
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