Propanediamine complexes

Cobalt, tris(l,2-propanediamine)-complexes structure, 1, 25 conformation, 1,25 nomenclature, 1, 129 stereonotation, 1,129... 

The N,N -dimethyl-l,3-propanediamine complex of cellulose, prepared from ramie, requires a large unit-cell, with a - 3.364 nm, b (chain axis) = 1.026 nm, c = 3.040 nm, and /3 = 32.74°. One diamine molecule per two /3-D-Glcp residues exists in the complex. 

Primary nitroparaffins react with two moles of formaldehyde and two moles of amines to yield 2-nitro-l,3-propanediamines. With excess formaldehyde, Mannich bases from primary nitroparaffins and primary amines can react further to give nitro-substituted cycHc derivatives, such as tetrahydro-l,3-oxa2iaes or hexahydropyrimidines (38,39). Pyrolysis of salts of Mannich bases, particularly of the boron trifluoride complex (40), yields nitro olefins by loss of the amine moiety. Closely related to the Mannich reaction is the formation of sodium 2-nitrobutane-1-sulfonate [76794-27-9] by warming 1-nitropropane with formaldehyde and sodium sulfite (41). 

Propanediamine, V-[2-(2-aminoethyl)amino]ethyi-metal complexes, 2, 51... 

Cyanoaminecobaltate(II) catalysts (/, p. 150) were initially studied in relation to the well-known activity of Co(CN)53 (/, p. 106). Use of such catalysts with optically active amines (1,2-propanediamine and N.N-dimethyl-1,2-propanediamine), thought to be bridged in complexes such as [(CN4)Co-amine-Co(CN4)]4 , led to asymmetric hydrogenation of atro-pate [Eq. (55)] to a 7% ee (309). 

Absorption and c.d. spectra of the complex formed between oxovanadium-(iv) and the Schiff base derived from (J )-l,2-propanediamine and two moles of acac indicate that the co-ordinated Schiff base moiety is close to planarity. The lack of spin-spin coupling between metal centres in iViV -propy-lenebis(salicyliminato)oxovanadium(iv) molecules (// = 1.78BM) has been discussed. Some seven new oxovanadium(iv) complexes with iV-(2-hydroxy-... 

Kx for copper (II)-diamine complex is 10.36 and 9.45 for 1,2-ethanediamine and 1,3-propanediamine, respectively (-2)]. The large difference in the stabilities of the two copper (II)-diamine complexes is attributed to an unfavorable entropy effect associated with an increase in the size of the metal-chelate ring (2). Extrapolating to the / -ketoimine derivatives, it seems reasonable to expect that the stability of bisacetylacetonetrimethylenediiminocopper(II) would be less than that of the ethylenediamine analog and to suspect that the former compound is less stable than bis-(4-iminopentane-2-ono) copper (II). That this is reasonable is... 

Complexes with 1,3-propanediamine (tmd) are less stable in water than those of en only complexes of the type Ni(tmd)3(C104)2 and Ni(tmd)2py2(C104)2 have been isolated in the solid state.682,683... 

The reaction of bis(salicylaldehydato)nickel(II)-2H20 with /w-xylenebis-2-(l,3-propanediamine) in EtOH results in the formation of the dinuclear complex (365).2621 This complex undergoes a quasi-reversible two-electron reduction at -1.47 V vs. SCE attributable to the formation of the corresponding dinuclear Ni1 complex. EPR measurements do not indicate any interaction between the two nickel(I) paramagnetic centres. The dinuclear nickel(I) complex forms adducts with CO and MeCN. 

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