Über Darstellung und Spaltung des Razemischen 1,2‐Diphenyl‐1,2‐Diaminoaethans (Stilbendiamin)

Visible light mediated homo- and heterocoupling of benzyl alcohols and benzyl amines on polycrystalline cadmium sulfide

“…24 Diamine 17d, obtained as a mixture of diastereomers, results from dehydrodimerization of 16d through a possible formation of an aminobenzyl radical, similarly to the above discussed homocoupling of benzyl alcohols and substituted benzyl amines.…”

“…The conversion of benzyl amine (16d) on CdS is less selective and irradiation leads to a product mixture of compounds 16c, 17c, 18c and 17d. 24 Diamine 17d, obtained as a mixture of diastereomers, results from dehydrodimerization of 16d through a possible formation of an aminobenzyl radical, similarly to the above discussed homocoupling of benzyl alcohols and substituted benzyl amines.…”

Substituted salen and baen tetradentate Schiff-base ligands. Synthesis, characterization, and electrochemistry of cobalt(III) complexes

“…Ethylenediamine, propylenediamine, l,2-diamino-2methylpropane, DL-isoamarine, and dibenzoylmethane were purchased from Aldrich Chemical Co. Salicylaldehyde was purchased from K & K Laboratories, Inc. 2,3-Diamino-2,3-dimethylbutane was prepared by the method of Sayre.30 The slightly yellow product was used without further purification. Racemic l,2-diamino-l,2-diphenylethane was prepared by a modification (see below) of the method of Lifschitz and Bos 31. Benzoylacetaldehyde was obtained from the Cu(II) complex following the procedure of Buelow and Sicherer.32 All solvents used in the syntheses were analytical grade reagents.…”

A Convenient Preparation of Enantiomerically Pure (+)‐(1R,2R)‐ and (−)‐(1S,2S)‐1,2‐Diamino‐1,2‐diphenylethanes

“…[10] Instead, the conjugation in the amidine sub-unit must be broken by conversion to a hydrolysable N-acetylamidine, followed by a twostep hydrolysis procedure to racemic diamine 1. [7,11] The enantiomers can then be resolved by diastereomeric salt formation with tartaric acid or mandelic acid followed by fractional crystallisation and formation of the free bases. Notwithstanding the activation-hydrolysis protocol followed by the resolution of the racemic diamine, the iso-amarine route to diamine 1 is inherently attractive because of the inexpensive nature of the starting materials and reagents viz., benzaldehyde and ammonia, the ease of conversion of amarine 3 into isoamarine 4, and the lack of need for any chromatographic purifications.…”