Reference

Enzymic resolution of alpha-hydroxyesters

Enzymic resolution of alpha-hydroxyesters. Miyazawa, Kazutoshi; Yoshida, Naoyuki (Chisso Corp., Japan). Eur. Pat. Appl. EP 459455 A2 4 Dec 1991, 12 pp. DESIGNATED STATES: R: CH, DE, FR, GB, LI. (European Patent Organization). CODEN: EPXXDW. CLASS: ICM: C12P041-00. ICS: C12P007-42. APPLICATION: EP 91-108815 29 May 1991. PRIORITY: JP 90-139869 31 May 1990. DOCUMENT TYPE: Patent CA Section: 16 (Fermentation and Bioindustrial Chemistry) Optically active a-hydroxyesters are produced by reacting an ester with ACH(OH)COOR ( R = C1-5 alkyl; A = C1-20 alkyl, perfluorophenyl, 2-phenylethyl, (substituted)phenyl or biphenyl) under substantially anhyd. conditions with an enzyme which catalyzes transesterification. Racemic Me 4-bromo-a-hydroxyphenylacetate and vinyl acetate was incubated with lipase to prep.In this experiment, several chemicals are used like 88271-13-0 and 34451-19-9 the R ester in 60% ee. A 2nd transesterification reaction with this ester resulted in a yield of 75% and an ee of 98%. .

Optically active phenylenediamines, and their polyimides or polyimide precursors

Optically active phenylenediamines, and their polyimides or polyimide precursors. Sahade, Daniel Antonio; Oda, Takuo (Nissan Chemical Industries, Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 2006016303 A2 19 Jan 2006, 17 pp. (Japanese). (Japan). CODEN: JKXXAF. APPLICATION: JP 2004-187213 25 Jun 2004. PRIORITY: JP 2004-164336 2 Jun 2004. DOCUMENT TYPE: Patent CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Section cross-reference(s): 25, 35, 38 The phenylenediamines are PX1X2OG or PX1(CH2)nOX2OG [P = diaminophenyl; X1 = O, CH2O, CO2; X2 = phenylene, diphenylene; G = (R)- or (S)-X3C*HX6X4X5; * = chiral point; X3 = single bond, CH2; x4 = CH2, CO2; X5 = C1-10 alkyl; X6 = CF3, Me; n = 1-10]. 34451-19-9 is the cas registry number of certain chemical which is used as reagents here. The polyimides or polyimide precursors bearing optically active groups on side chains are useful for liq. crystal alignment films for displays. .