Search

The hydrido silyl iron complex (o-Ph2PC6H4SiMe2)Fe(PMe3)3H (2) was obtained via the activation of the Si–H bond of the bidentate silyl ligand o-Ph2P(C6H4)SiMe2H (1) by Fe(PMe3)4. 2 showed good to excellent catalytic activity in both the reduction of aldehydes/ketones and the dehydration of benzamide. In addition, with complex 2 as a catalyst, α,β-unsaturated carbonyls could be selectively reduced to the corresponding α,β-unsaturated alcohols. The mechanisms of the formation of 2 and the catalytic dehydration process are proposed and partly experimentally verified. [ABSTRACT FROM AUTHOR]

Two novel cobalt Schiff base complexes 3 and 4, ((2-PPh2)C6H4)C=N(C10H7)Co(PMe3)2 (3) and ((2-PPh2)C6H4)CH=N(C6H5)Co(PMe3)2 (4) with η2(C–H) coordination, were synthesized by the reactions of Schiff base preligands ((2-PPh2)C6H4)CH=N(C10H7) (1) and ((2-PPh2)C6H4)CH=N(C6H5) (2) with CoMe(PMe3)4via sp2 C–H bond activation. Under similar reaction conditions, the reactions of Co(PMe3)4 with 1 and 2 gave rise to the simple π-(C=N)-coordinated cobalt(0) complexes ((2-PPh2)C6H4)CH=N(C10H7)Co(PMe3)2 (5) and ((2-PPh2)C6H4)CH=N(C6H5)Co(PMe3)2 (6). Complex ((2-PPh2)C6H4)C=N(C10H6)CoI(PMe3)2 (7) was obtained through the reaction of 3 with iodomethane via the activation of the second C–H bond in 1. The substitution reaction of complex 3 with carbon monoxide afforded the dicarbonyl cobalt(i) complex ((2-PPh2)C6H4)C=N(C10H7)Co(CO)2(PMe3) (8). The molecular structures of 4, 5, 7 and 8 were determined by single-crystal X-ray diffraction. [ABSTRACT FROM AUTHOR]

A catalytic system of regioselective synthesis of allyl sulfides via hydrothiolation of terminal arylallenes with arylthiols has been developed using nickel(0) complex Ni (PMe3)4 as a catalyst. In most cases the excellent to moderate yields were obtained under mild conditions. A catalytic mechanism was suggested and partially‐experimentally verified. To the best of our knowledge, this is the first example of regioselective addition of thiophenols to terminal arylallenes catalyzed by nickel(0) complex. It was noteworthy that this catalytic system was only applicable to thiophenol compounds with terminal arylallenes. [ABSTRACT FROM AUTHOR]

A catalytic system of regioselective synthesis of allyl sulfides via hydrothiolation of terminal arylallenes with arylthiols has been developed using nickel(0) complex Ni (PMe3)4 as a catalyst. In most cases the excellent to moderate yields were obtained under mild conditions. A catalytic mechanism was suggested and partially‐experimentally verified. To the best of our knowledge, this is the first example of regioselective addition of thiophenols to terminal arylallenes catalyzed by nickel(0) complex. It was noteworthy that this catalytic system was only applicable to thiophenol compounds with terminal arylallenes. [ABSTRACT FROM AUTHOR]