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Towards NHC stabilized alkylgallium alkoxide/aryloxide cations – The advances, the limitations and the challenges
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SYSNO ASEP 0474178 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Towards NHC stabilized alkylgallium alkoxide/aryloxide cations – The advances, the limitations and the challenges Tvůrce(i) Dabrowska, A. M. (PL)
Hurko, A. (PL)
Dranka, M. (PL)
Varga, Vojtěch (UFCH-W) RID
Urbańczyk, M. (PL)
Horegland, P. (PL)Zdroj.dok. Journal of Organometallic Chemistry. - : Elsevier - ISSN 0022-328X
Roč. 840, JUL 2017 (2017), s. 63-69Poč.str. 7 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova carbene ; cations ; gallium Vědní obor RIV CF - Fyzikální chemie a teoretická chemie Obor OECD Physical chemistry CEP GA14-08531S GA ČR - Grantová agentura ČR Institucionální podpora UFCH-W - RVO:61388955 UT WOS 000401126700008 EID SCOPUS 85018325928 DOI 10.1016/j.jorganchem.2017.03.046 Anotace Here we describe and discuss an approach to the synthesis of alkylgallium alkoxide and aryloxide cations stabilized with N-heterocyclic carbenes (NHCs). The reaction of methyl abstracting agent B(C6F5)3 with Me2Ga(OAr,CNHC) complexes stabilized by aryloxide ligands with N-heterocyclic carbene functionalities (1 and 2) has led to the formation of cationic complexes [MeGa(OAr,CNHC)]22+ (32+ and 42+). [3][MeB(C6F5)3]2 and [4][MeB(C6F5)3]2, which are the first examples of alkylgallium aryloxide cationic complexes, have been isolated and characterized by both spectroscopic and X-ray techniques. In contrast, the reaction of alkoxide derivative Me2Ga(O,CNHC) (5) with B(C6F5)3 and [Ph3C][B(C6F5)4] has led to the formation of adducts Me2Ga(O,CNHC)·B(C6F5)3 (6) and [Me2Ga(O,CNHC)·Ph3C]+. Although, the reactions of B(C6F5)3 with Me2Ga(OC6H4OMe)(SIMes) (7) or Me2GaOMe(SIMes) (8) (SIMes = 1,3-bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene) have resulted in the formation of cationic species [MeGaOR(SIMes)]+, as evidenced by spectroscopic techniques, the side reactions resulting in the formation of (SIMes)B(C6F5)3 and boron alkoxide species have also been observed. Cationic complexes [3][MeB(C6F5)3]2 and [4][MeB(C6F5)3]2 are poor catalysts for the ring-opening polymerization of cyclic esters and are essentially not active in the low pressure polymerization of ethylene. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2018
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