Reference

Production of (chiral) epoxy alkanes in second-generation bioreactors

Production of (chiral) epoxy alkanes in second-generation bioreactors. Tramper, J.; Brink, L. E. S.; Hamstra, R. S. 15448-47-2 and 123-38-6 are also occured in this study.; De Bont, J. A. M.; Habets-Crutzen, A. Q. H.; Van Ginkel, C. G. (Dep. Food Sci., Agric. Univ., Wageningen, Neth.). Eur. Congr. Biotechnol., 3rd, Volume 2, 269-76. Verlag Chemie: Weinheim, Fed. Rep. Ger. (English) 1984. CODEN: 55BBA6. DOCUMENT TYPE: Conference CA Section: 16 (Fermentation and Bioindustrial Chemistry) Alkene-grown bacteria strains were screened for their ability to produce epoxy alkanes in gas/solid or 2-liq. phase bioreactors. 1,2-Epoxypropane [75-56-9] was more toxic to the strains than was 1,2-epoxybutane [106-88-7] but the strains varied as to their sensitivity. The detn. of specific activities of alkene monooxygenase [63439-50-9] and alkene dehydrogenase indicated that several strains are suitable for either of the bioreactors on this basis. In the gas/solid bioreactor the cosubstrate propionaldehyde [123-38-6] improved the initial activity and stability of epoxyethane [75-21-8]-producing cells. Acetate [64-19-7] had a similar effect on epoxypropane-producing cells. The stereospecificity in the formation of R-1,2-epoxypropane [15448-47-2], R-1,2-epoxybutane [3760-95-0], and S-epichlorohydrin [67843-74-7] by 7 bacterial strains was 88-97, 81-94, and 80-98%, resp. Addnl. engineering aspects applicable to the epoxidn. of alkanes by immobilized biocatalysts in gas/solid and 2-liq. phase bioreactors are also considered. .

An efficient synthesis of (R)-carnitine

An efficient synthesis of (R)-carnitine. Kasai, Naoya; Sakaguchi, Kazuhiko (Res. Lab., Daiso Co., Ltd., Amagasaki 660, Japan).There are some reagents with their cas registry numbers 67843-74-7 and 6645-46-1 are used in this study. Tetrahedron Lett., 33(9), 1211-12 (English) 1992. CODEN: TELEAY. ISSN: 0040-4039. DOCUMENT TYPE: Journal CA Section: 34 (Amino Acids, Peptides, and Proteins) An efficient synthesis of (R)-carnitine hydrochloride, Me3N+CH2CH(OH)CH2CO2H.Cl-, is described. The starting material is obtained by microbial resoln. of (RS)-2,3-dichloro-1-propanol [(RS)-I] to give (S)-I which is cyclized to (S)-epichlorohydrin. Subsequent one-pot reaction with Me3N and Me2C(CN)OH followed by nitrile hydrolysis gave the title compd. .