Photolysis of [Mn(C^N)(CO)4] (C^N = bis-(4-methoxyphenyl)methanimine) in heptane solution results in ultra-fast CO dissociation and ultimate formation of a rare Mn-containing dinitrogen complex fac-[Mn(C^N)(CO)3(N2)].
Manganese-mediated borylation of aryl/heteroaryl diazoniums alts emerges as ag eneral and versatile synthetic methodology for the synthesis of the corresponding boronate esters. The reactionp roved an ideal testing ground for delineating the Mn species responsible for the photochemical reactionp rocesses, that is, involving either Mn radical or Mn cationic species, which is dependent on the presence of as uitably strong oxidant. Our findingsa re important for ap lethora of processes employing Mn-containing carbonyl speciesa si nitiators and/or catalysts, which have considerable potential in synthetic applications. Scheme1.Light mediated borylation of aryl diazoniums.
The influence of various physical and chemical factors on the swelling of polystyrene and PEG based resins in greener organic solvents has been systematically investigated. In general, chemical factors: the nature of the functionality/linker and the degree of loading were found to have a far larger influence on the swelling of the resins than physical parameters such as bead size. The results are interpreted in terms of Hansen solubility parameters for the solvents and there is evidence that some solvents interact with the polymeric core of a resin whilst others interact with the functionality. The results are extended to a study of the changes in resin swelling observed during both deprotection and chain elongation reactions during solid phase peptide synthesis.
Correction for ‘Time-resolved infra-red spectroscopy reveals competitive water and dinitrogen coordination to a manganese(i) carbonyl complex’ by Jonathan B. Eastwood et al., Dalton Trans., 2020, DOI: 10.1039/c9dt04878b.
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