Trifluoromethanesulfonate ligands

The chiral titanium complexes modified by the perchlorate or trifluoromethanesulfonate ligand such as (R)-l,l -bi-2,2 -naphthotitanium diperchlorate (BIN0L-Ti(C104)2) or (7 )-l,l -bi-2,2 -naphthotitanium ditriflate ((I )-BINOL-Ti(OTf)2) can easily be prepared by the addition of Silver(I) Perchlorate or Silver(I) Trifluoromethanesulfonate (2 equiv) to BINOL-TiCl2 (eq 2). ... 

Ene Cyclization, " The asymmetric catalysis of the intramolecular carbonyl-ene reaction not only of type (3,4) but also (2,4) employs the BINOL-derived titanium complexes [(I )-BINOL-TiX2 X = C104 or OTf], modified by the perchlorate and trifluoromethanesulfonate ligands. The tmns-... 

A series of diastereomeric platinum(II) complexes of the type c -[PtL2Y2]2+ (L - 3-bromopyr-idine, quinoline, isoquinoline Y = PEt3, Y2 = dppp, (/ )-(I )-2,2 -bis(diphenylphosphino)-l, l -binaphthyl (R-( I )-binap)) have been prepared by the reaction of c -[PtY2(OTf)2] (OTf=tri-trifluoromethanesulfonate) with two equivalents of the N-donor ligand.207 Related complexes have also been studied, for example when L = pyridine.208 Restricted rotation about the Pt—N bonds in many of the complexes is usually detected by NMR spectroscopy, with only [Pt(dppp)(isoquinoline)2]2+ (65) exhibiting dynamic behavior at ambient temperatures. The PEt3... 

Vahrenkamp and co-workers formed a number of chelate-stabilized ketone complexes with pyridylphenyl ketone. Octahedral complexes formed with a 2 1 ratio of ligand to zinc were formed with trifluoromethanesulfonate, chloride, and bromide anions. 1 1 reactions resulted in the formation of square pyramidal [ZnL2X]+ with X = Br, I, and a trigonal-bipyramidal dimer [L2Zn(NCS)2]2 with thiocyanate bridges.350... 

Facile C-H bond activation by Pt(II) metal centers seems to require at least one labile ligand in the coordination sphere of platinum. One of the earliest intermolecular examples of this is the activation of C-D bonds in benzene-f/, by 0 an.S -(PAIe .) Pt(neopentyl)(OTf) at 133 °C, where trifluoromethanesulfonate (triflate, OTf) provides the labile group (Scheme 7, A) (26). 

The facially coordinating l,4,7-tiimethyl-l,4,7-triazacyclononane (Cn) ligand forms stable methylrhodium(III) complexes, such as [Rh(Me)3Cn], [Rh(Me)2Cn]OTf and [Rh(Me)Cn](OTf)2 (OTf=trifluoromethanesulfonate) and the latter two have rich aqueous chemistry. When dissolved in water, [Rh(Me)Cn] readily coordinates two water molecules to form the... 

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