Fluoride adducts of niobium(V): Activation reactions and alkene polymerizations

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• 作者：Mohammad Hayatifar ; Fabio Marchetti ^{fabmar@dcci.unipi.it} ; Guido Pampaloni ; ^{pampa@dcci.unipi.it} ; Yogesh Patil¹ ; Anna Maria Raspolli Galletti
• 关键词：Niobium ; Fluoride ; Activation ; Olefin polymerization
• 刊名：Inorganica Chimica Acta
• 出版年：2013
• 出版时间：1 April, 2013
• 年：2013
• 卷：399
• 期：Complete
• 页码：214-218
• 全文大小：284 K

文摘

Fluoride coordination derivatives of niobium(V) were tested for their activation capabilities with respect to acetone and to olefins. Activation of acetone (formation of mesityloxide) was observed with NbF₄(OMe). Several fluoride coordination derivatives of niobium(V) of different nature (neutral or ionic) and nuclearity, i.e. NbF₅L [L = Et₂O, 4, thf, 5 (thf is tetrahydrofuran), MeOH, 6, EtOH, 7], (NbF₄L₂)(NbF₆) [L = dmf, 8 (dmf is dimethylformamide), dme, 9 (dme is dimethoxyethane)], (NbF₄L₄)(NbF₆) [L = thf, 10, Et₂O, 11, MeCN, 12], [S(NMe)₃][NbF₆], 13, NbF₄OMe, 1, NbF₄OPh, 3), NbF₃(OPh)₂, 14, NbF₂(OPh)₃, 15 and NbF₂(OEt)₃, 16, promoted the polymerization of ethylene using AlMe₃-depleted methylaluminoxane as cocatalyst. Highly linear polyethylene was obtained. Compound 3, upon activation with methylaluminoxane, promoted ring-opening metathesis polymerization (ROMP) of norbornene, affording polymers with a slight excess of trans content.