Synthesis of Rh(I) diamine complexes and their exploitation for asymmetric hydrogen transfer processes

Iridium complexes of chiral diamines containing carbon and nitrogen stereocentres: synthesis, structure and evaluation as transfer hydrogenation catalysts

“…Jones recently described two Rh(I) complexes of N,N-dibenzyl-(1R,2R)-diaminocyclohexane and N,N-diferrocenyl-(1R,2R)diaminocyclohexane where the N atoms in both examples acquired opposite absolute configurations and a syn relationship between the nitrogen substituents. 7 Relatively strong heteronuclear hydrogen bonding interactions N(1)HÁ Á ÁF between the amine group and the BF 4 À anion are also observed, with an HÁ Á ÁF distance of 2.09 A ˚. X-Ray analysis of Rh complex 3 gave a structure similar to that of Ir complex 4.…”

“…[a] 20 D À42.8 (c 0.025, CHCl 3 ); IR (KBr, cm À1 ) 3232, 3199,3058,3025,2957,2918,1625,1499,1471,1448,1379,1311,1284 cm À1 ; 1 H NMR (400 MHz, CDCl 3 ) d = 0.68 (3H, d, J 7.3 Hz, CH 3 ), 0.77-1.33 (6H, m, CH 2 CHCHCH 2 ), 0.92 (3H, d, J 7.3 Hz, CH 3 ), 1.53 (15H, s, C 5 (CH 3 ) 5 ), 1.79 (3H, d, J 7.4 Hz, CH 3 ), 1.80 (3H, d, J 7.6 Hz, CH 3 ), 3.02-3.12 (1H, m, CH), m,CH),m,2ÂCH),4.98 (1H,d,J 11.2 Hz,NH),6.22 (1H,d,J 10.8 Hz,NH) X-Ray crystallography of (S N1 ,S N2 ,R C1 ,R C2 ,R C4 ,R C5 , S C7 ,S C15 )-(À)-4. C 36 H 51 BCl 7 F 4 N 2 Ir, M = 1038.95, orthorhombic, space group P2(1)2( 1)2( 1), Z = 4, a = 13.5451 (7), b = 17.3548(10), c = 18.4163(10) A ˚, a = 901, b = 901, g = 901, V = 4329.2(4) A ˚3, r calcd 1.594 mg m À3 , m(MoKa) = 3.561 mm À1 (max./min. transmission 1.0000/0.7678), T = 93(2) K. Of 28 479 measured data, 7939 were unique (R int = 0.0423) and 7663 observed [I 4 2s(I)] to give R = 0.0290, wR2 = 0.0570.…”

Synthesis, characterization, spectroscopic and crystallographic investigation of Cobalt(III) schiff base complex with two perpendicular diamine coumarin ligands

“…For example, complexes based on chiral diamines have been employed for chiral hydrogenations and transfer hydrogenations [22]. Both homogeneous and heterogeneous diamine complexes have proved highly effective in enantioselective catalysis [23,24].…”

Crystal structure of a hybrid salt–cocrystal and its resolution by preferential crystallization: ((±)trans-N,N′-dibenzyldiaminocyclohexane)(2,3-dichlorophenylacetic acid)4

“…trans-N,N 0 -Dibenzyldiaminocyclohexane (compound B) was prepared according to Jones and Mahon, 28 which was applied with modifications (Fig. 15).…”