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5,6-Dihydrodibenzo[c,e][1,2]azaphosphinine-Based PNP Ligands, Cr(0) Coordination, and Cr(III) Precatalysts for Ethylene Oligomerizationстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Nifant’ev Ilya E., Vinogradov Alexander A., Vinogradov Alexey A., Roznyatovsky Vitaly A., Grishin Yuri K., Ivanyuk Alexey V., Sedov Igor V., Churakov Andrei V., Ivchenko Pavel V.
- Журнал: Organometallics
- Год издания: 2018
- Издательство: American Chemical Society
- Местоположение издательства: United States
- DOI: 10.1021/acs.organomet.8b00427
- Аннотация: We elaborated a synthetic approach to a new family of PNP ligands that involves assembling sequential molecules based on the rigid 5,6-dihydrodibenzo[c,e][1,2]-azaphosphinine backbone (−Z−). This approach allowed us to obtain PNP-type ligands of the general formula Ar2P−Z−Ar′(Ar, Ar′ = Ph, o-MeOC6H4) with high yields and without the formation of PPN byproducts. Ar2P−Z−Ar′/Cr(acac)3 (acac = acetylacetonate) adducts activated by modified methylalumoxane(MMAO-12) effectively catalyzed ethylene oligomerization; the number of ortho-methoxyphenyl fragments n controls the direction of the process, from slow polymerization (n = 0)to rapid oligomerization (n = 3), thereby producing a mixture of 1-hexene and 1-octene in ∼2:1 ratio with very low formation of polyethylene (∼0.6%).
- Добавил в систему: Нифантьев Илья Эдуардович