Electric dipole moments and molecular conformations of benzophenones, benzils, benzhydrols, and benzoins

Rotational dynamics of molecules containing phenyl groups. A 13C spin‐lattice relaxation study

“…This comparison, which tests the validity of the model, has been used in earlier relaxation experimentsIh to probe the relative order of magnitude of internal motion in diphenyl dichalcogenides. Assuming the benzil molecule in its most probable transconformation, 11,21,22 with planar PhCO units bisected by an angle of 98", a calculated Tl ratio of 1.194 was obtained, which is in very good agreement with the experimental ratio of 1.133. This demonstrates that phenyl internal rotation in benzil is severely hindered by an strong conjugation interactions in each PhCO unit, in accord with earlier findings."…”

Enantioselective Synthesis of α-Hydroxy Ketones via Benzaldehyde Lyase-Catalyzed C−C Bond Formation Reaction

“…[24] , mp 60 ± 628 C for (R)-1,2-Bis(2-chlorophenyl)-2-hydroxyethan-1-one (2c) Colorless solid; yield: 80% (97% ee); mp 57 ± 618 C [Lit. [30] , (R)-2-Hydroxy-1,2-bis(2-methoxyphenyl)ethan-1-one (2e) Colorless solid; yield: 87% (> 99% ee); mp 998 C [Lit. [25] , mp 98 ± 998 C for …”

“…[24] , (R)-1,2-Bis(4-chlorophenyl)-2-hydroxyethan-1-one (2l) Colorless solid; yield: 95% (> 99% ee); mp 898 C [Lit. [28,30] , mp 87 ± 888 C for (R)-1,2-Bis-(4-bromophenyl)-2-hydroxyethan-1-one (2m) Colorless solid; yield: 83% (> 99% ee); mp 85 ± 878 C [Lit. [29] , mp 95 ± 988 C for (R)-2-Hydroxy-1,2-bis(4-methylphenyl)ethan-1-one (2o) Colorless solid; yield: 94% (> 99% ee); mp 908 C [Lit.…”

“…[29] , mp 95 ± 988 C for (R)-2-Hydroxy-1,2-bis(4-methylphenyl)ethan-1-one (2o) Colorless solid; yield: 94% (> 99% ee); mp 908 C [Lit. [30] , (R)-2-Hydroxy-1,2-di(2-naphthalenyl)ethan-1-one (2q) Colorless solid; yield: 98% (> 99% ee); mp 1278 C [Lit. [31] , mp 125 ± 1268 C for (R)-1,2-Di(2-thienyl)-2-hydroxyethan-1-one (2s) Colorless solid; yield: 73% (91% ee); mp 1078 C [Lit.…”

Molecular conformations of ortho-substituted benzophenones

“…Calculations Tlie conformational preferences of substituted benzophenones have been investigated by n variety of experimental techniques: uv (1, 2), ir (2,3), and nmr spectroscopy (4-6) and dipole moments (3,7). Theoretical studies have been reported on benzophenone (8,9) anct on some of its ,net(/-and porn-derivatives (10).…”