By V Ramamurthy; Kirk S Schanze

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Solid state .. dlamlnes and metals tested: dlamlne • en, tn, (±)·or (R,R)·t-chxn, c-chxn M • Mg, Ca, Sr, Ba, Zn head-to-tall head-to-head mixed CCO+ ~ .. · AN exafl1)1e: DAN h-to·t mixed 16 5 •Dried In vacuo HHDHA OAQ DHA 5 2 2 .. z• DAN 0 .. photostable (9·Ac-)z(c-ctlxnHl+)(EtOH)z. s• AN HH 7 42 3 3 0 AQ 9-AC 2 98 % 2 67 3 97 3 34 at 70 OC. of the hydrogen bond network, which tends to be preserved in the course of the isomerization [85]. An interesting dimerization reaction was reported for the crotonic acid salt (Scheme 53) [86].

This difference may be ascribed to their short c1 .. · C2' (and c1 .. 8 A). For the cocrystal17 · g, the stereocenter in R-(- )-2-phenylpropionic acid (g) was retained to a certain extent in the course of the decarboxylative condensation. Thanks to the exploratory work of Schmidt et al. [42], the concept of absolute asymmetric induction starting from chiral crystals of achiral molecules is now very commonly known [1,43]. A 1:1 hydrogen-bonded cocrystal of acridine and diphenylacetic acid 17·h is chiral (space group P2 12121).

AN exafl1)1e: DAN h-to·t mixed 16 5 •Dried In vacuo HHDHA OAQ DHA 5 2 2 .. z• DAN 0 .. photostable (9·Ac-)z(c-ctlxnHl+)(EtOH)z. s• AN HH 7 42 3 3 0 AQ 9-AC 2 98 % 2 67 3 97 3 34 at 70 OC. of the hydrogen bond network, which tends to be preserved in the course of the isomerization [85]. An interesting dimerization reaction was reported for the crotonic acid salt (Scheme 53) [86]. IX. SOLID MIXTURES Despite a large number of reports on the solid-state bimolecular photoreactions (photodimerization) of cinnamic acids [2], bimolecular photoreactions between different organic compounds in the solid state had been little studied when the present author undertook investigations about the bimolecular photoreaction of solid mixtures [87].

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