Highly Efficient and Selective CH Activation in Gallium‐Containing Molten‐Salt Systems

Mononuclear Organometallic Platinum(II) Complexes and Platinum(II)−Copper(I) Mixed Complexes from Symmetrical 3,5-Bis(iminoacetyl)pyrazolate Ligands

“…Mp: ≥133 °C (dec) {lit. 100 °C}. 1 H NMR (CDCl 3 , 300 MHz): δ 7.37 (dd, 3 J (H−H) = 7.9 Hz, 5 J (H−H) = 1.4 Hz, 3 J ( 195 Pt−H) = 72.1 Hz, 4H, PtArH 2,6 ) 7.00−6.86 (m, 4H, PtArH 3,5 ), 6.80−6.73 (m, 2H, PtArH 4 ), 2.11 (s, 3 J ( 195 Pt−H) = 23.6 Hz, SCH 3 ).…”

“…As a matter of fact, C-H bond activation has been observed for a range of different transition metals. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] In particular, organometallic complexes of platinum incorporating N-donor ligands have been shown to activate the C-H bonds of benzene [20][21][22][23][24][25][26][27] and methane [28][29][30][31] to form phenyl or methyl complexes, respectively. Higher alkanes can also be activated to give dehydrogenation products.…”

“…The selective activation and functionalization of alkyl and aryl C−H bonds under mild conditions is a major challenge for today’s chemists. − The versatile chemistry of transition metals, which are able to bind to alkanes and arenes and form strong M−C and M−H bonds, is likely to play an important role in this field. As a matter of fact, C−H bond activation has been observed for a range of different transition metals. − In particular, organometallic complexes of platinum incorporating N-donor ligands have been shown to activate the C−H bonds of benzene − and methane − to form phenyl or methyl complexes, respectively. Higher alkanes can also be activated to give dehydrogenation products. − The mechanism of some of these transformations has been extensively studied by several groups, ,,,,− including ours. − These reactions are thought to proceed through the initial complexation of a σ C−H bond to a Pt(II) center, followed by oxidative addition to form a transient Pt(IV) phenyl (or alkyl) hydride complex.…”

A Combinatorial Approach towards a Library of Chiral γ-Lactams and 2,3-Disubstituted Pyrroles

“…24 Beforehand only a limited number of transition-metal-catalyzed reactions in ionic liquids proceeding via C-H activation steps have been reported, including activation of methane, dehydrogenation of cyclooctadiene, isomerization of alkenes, or C-H activation of terminal alkynes. [25][26][27][28][29] Unfortunately, this reaction does not work in ionic liquids if the multi-reactor station shown in Figure 1 is employed. This is most probably due to the low solubility of CO in ionic liquids 30 in combination with the small surface, which is caused by the slim layout of the autoclaves.…”