Nickel-Catalyzed Mizoroki–Heck Reaction of Aryl Sulfonates and Chlorides with Electronically Unbiased Terminal Olefins: High Selectivity for Branched Products**
| Title: | Nickel-Catalyzed Mizoroki–Heck Reaction of Aryl Sulfonates and Chlorides with Electronically Unbiased Terminal Olefins: High Selectivity for Branched Products** |
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| Authors: | Sarah Z. Tasker; Dr. Alicia; C. Gutierrez; Prof Timothy; F. Jamison; Timothy F. Jamison |
| Contributors: | The Pennsylvania State University CiteSeerX Archives |
| Source: | http://dspace.mit.edu/bitstream/handle/1721.1/94650/Jamison_Nickel-catalyzed.pdf%3Bjsessionid%3D2852B008810E2091AE79A8D5CC9B3A49?sequence%3D1. |
| Collection: | CiteSeerX |
| Subject Terms: | alkenes |
| Description: | Achieving high selectivity in the Heck reaction of electronically unbiased alkenes has been a longstanding challenge. Using a nickel-catalyzed cationic Heck reaction, we were able to achieve excellent selectivity for branched products (≥19:1 in all cases) over a wide range of aryl electrophiles and aliphatic olefins. A bidentate ligand with a suitable bite angle and steric profile was key to obtaining high branched/linear selectivity, while the appropriate base suppressed alkene isomerization of the product. Though aryl triflates are traditionally used to access the cationic Heck pathway, we have shown that by using triethylsilyl trifluoromethanesulfonate (TESOTf), we can effect a counterion exchange of the catalytic nickel complex such that cheaper and more stable aryl chlorides, mesylates, tosylates, and sulfamates can be used to yield the same branched products with high selectivity. Keywords |
| Document Type: | text |
| File Description: | application/pdf |
| Language: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1027.7706 |
| Availability: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1027.7706; http://dspace.mit.edu/bitstream/handle/1721.1/94650/Jamison_Nickel-catalyzed.pdf%3Bjsessionid%3D2852B008810E2091AE79A8D5CC9B3A49?sequence%3D1 |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| Accession Number: | edsbas.B70B2857 |
| Database: | BASE |