A New Atropisomeric Molecular Structure for Efficient Enantiodifferentiation

Abstract

iodine cell Fig. 2. Diagram of the experimental setup: MCP, multichannel plates; TR. transient recorder; PC, dedicated computer H P QS/20; PD, photodiode; INT, integrator: SMS, control of the stepping motor for frequency-doubling crystal. the detected ZEKE signal on the laser wavelength gives information on the rovihronic states of the ionized molecule.

Crystalline Complexes of 2,2′-Bis(9-hydroxy-9-fluorenyl)biphenyl Host with Oligofunctional and Conjugate Functional Group Guests

“…. O1 2.700(2)-2.869(5)Å ], which is also present in the previous structures involving this host compound [13][14][15][16][17][18][19]. Although the phenyl rings are arranged nearly orthogonal to each other (t 1 ¼ 90.0-93.98), the torsion angles t 2 and t 3 range between 216.58 and 29.58, and 215.38 and 28.18, respectively, indicating conformational freedom of the fluorenyl moieties with regard to their adjacent phenyl rings.…”

“…The host compound 1 was prepared as described in the literature [13,14]. The crystalline inclusions 1a-d were obtained by recrystallization of 1 from the respective guest solvent.…”

“…The host compound 1 was synthesized according to the literature procedure [13,14]. Crystals of the inclusion compounds 1a -d suitable for X-ray investigations were obtained by slow evaporation of solutions of 1 in the respective guest solvent.…”

“…In many cases, they feature two bulky carbinol moieties being attached to a rigid central unit [12]. A well known exponent of this structure type is represented by the host compound 2,2 0 -bis(9-hydroxy-9-fluorenyl)biphenyl [13,14] given with formula 1 (Scheme 1).…”

2,2′-Bis(9-hydroxy-9-fluorenyl)biphenyl–ethyl acetate (1/1)

“…For related literature, see: Barbour et al (1993); Ibragimov et al (2001); Sardone (1996); Sumarna et al (2003); Weber et al (1993). Hydrogen-bond geometry (Å , ).…”