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p -(Difluoroiodo)toluene (p -TolIF2) is a versatile fluorinating agent that acts as both a surrogate for elemental fluorine, and as a source of 'electrophilic' fluorine. Described here is a detailed three-step synthesis of p -TolIF2 , carried out on a 50 mmol scale, that consistently provides high-quality product that is suitable for long-term storage. The reactions employ inexpensive, readily available starting materials and reagents, and uses the commodity chemical 48% aqueous HF as the source of fluorine atoms. [ABSTRACT FROM AUTHOR]

p -(Difluoroiodo)toluene (p -TolIF2) is a versatile fluorinating agent that acts as both a surrogate for elemental fluorine, and as a source of 'electrophilic' fluorine. Described here is a detailed three-step synthesis of p -TolIF2 , carried out on a 50 mmol scale, that consistently provides high-quality product that is suitable for long-term storage. The reactions employ inexpensive, readily available starting materials and reagents, and uses the commodity chemical 48% aqueous HF as the source of fluorine atoms. [ABSTRACT FROM AUTHOR]

A rapid, mild and metal-free intermolecular cyclopropanation between iodonium ylides and alkene-containing substrates mediated by PhI(OAc)2·Bu4NI is reported. Iodonium ylides of cyclic and acyclic 1,3-dicarbonyls were reacted with a variety of mono-, di-, tri- and tetra-substituted alkenes of various structural types to give 29 cyclopropanes in up to 97% yield. [ABSTRACT FROM AUTHOR]

The cover picture shows the proposed sequence of events for the borosilicate glass‐activated gem‐difluorination of phenyl diazoacetate using the hypervalent iodine reagent (difluoroiodo)toluene (TolIF2). Progress from diazo to gem‐difluoride involves two distinct fluorination events and the evolution of nitrogen gas. Quantum chemical calculations of a borosilicate‐like cluster show that the boron atom is sufficiently Lewis‐acidic so as to spontaneously abstract fluoride from TolIF2. The role of borosilicate glassware, which is the most effective activator discovered to date, was confirmed experimentally. Details are discussed in the Communication by W. S. Hopkins, G. K. Murphy et al. on p. 4603 ff. [ABSTRACT FROM AUTHOR]

New high-resolution visible Fourier transform emission spectra of the A (2)Π → X (2)Σ(+) and B' (2)Σ(+) → X (2)Σ(+) systems of (24)MgD and of the B' (2)Σ(+) → X (2)Σ(+) systems of (25,26)MgD and (25,26)MgH have been combined with earlier results for (24)MgH in a multi-isotopologue direct-potential-fit analysis to yield improved analytic potential energy and Born-Oppenheimer breakdown functions for the ground X (2)Σ(+) state of MgH. Vibrational levels of the ground state of (24)MgD were observed up to v" = 15, which is bound by only 30.6 ± 0.10 cm(-1). Including deuteride and minor magnesium isotopologue data allowed us also to determine the adiabatic Born-Oppenheimer breakdown effects in this molecule. The fitting procedure used the recently developed Morse/Long-Range (MLR) potential energy function, whose asymptotic behavior incorporates the correct inverse-power form. A spin-splitting radial correction function to take account of the (2)Σ spin-rotation interaction was also determined. Our refined value for the ground-state dissociation energy of the dominant isotopologue ((24)MgH) is D(e) = 11,104.25 ± 0.8 cm (-1), in which the uncertainty also accounts for the model dependence of the fitted D(e) values for a range of physically acceptable fits. We were also able to determine the marked difference in the well depths of (24)MgH and (24)MgD (with the deuteride potential curve being 7.58 ± 0.30 cm(-1) deeper than that of the hydride) as well as smaller well-depth differences for the minor (25,26)Mg isotopologues. This analytic potential function also predicts that the highest bound level of (24)MgD is v" = 16 and that it is bound by only 2.73 ± 0.10 cm(-1).