Polyethyl substituted weakly coordinating carborane anions: a sequential dehydrogenative borylation-hydrogenation route.
نویسندگان
چکیده
Polyethylated carborane monoanions based on [closo-CB11H12]- with up to five B-ethyl groups can be prepared by a sequential Rh-catalysed dehydrogenative borylation then hydrogenation.
منابع مشابه
Triflyloxy-substituted carboranes as useful weakly coordinating anions.
New carborane anions carrying one or three triflyloxy substituents are described. The mono-triflyloxy substituted carborane can be halogenated to give pentabromo and decachloro derivatives with preservation of the B-OTf linkage. The use of [HCB11Cl10OTf](-) as a weakly coordinating anion is demonstrated.
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Unlike the "parent" carborane anion CHB(11)H(11)(-), halogenated carborane anions such as CHB(11)H(5)Br(6)(-) can be readily C-functionalized in high yield and purity, enhancing their utility as weakly coordinating anions.
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Iridium hydridophosphine complexes of general formula [Ir(PR3)2H2(anion)](PR3= PPh3, PMe2Ph; anion =[1-closo-CB(11)H(6)Cl(6)]-, [1-closo-CB(11)H(6)I(6)]-, [BAr(F)4]-) have been prepared by hydrogenation of cyclooctadiene precursor complexes. Solid-state structures of selected examples of these complexes reveal intimate contacts between the carborane anion and cation, with the anion binding thro...
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The reportedly unprotonatable pentacyano-cyclo-pentadienide ion, C(5)(CN)(5)(-), can be protonated and silylated at the cyano N atom using electrophilic reagents derived from weakly coordinating carborane anions.
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The weakly coordinating carborane anion in ion-like trialkylsilyl species R3Si(CHB11Cl11) can be displaced by nucleophiles as weak as ortho-dichlorobenzene, SO2 and trialkylsilanes, the latter forming nearly linear hydride bridges in R3Si-H-SiR3+ cations.
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عنوان ژورنال:
- Chemical communications
دوره 28 شماره
صفحات -
تاریخ انتشار 2005