Manufacturing processes for Se-methyl-L-selenocysteine
申请人:Sami Labs Limited
公开号:US06794537B1
公开(公告)日:2004-09-21
Convenient processes are described for the synthesis of L-Se-methyselenocysteine from chloroalanine derivatives. The process is easily extendable to other selenium substituted amino acids. DL-Se-methyselenocysteine is easily obtained by a benzaldehyde-catalyzed racemization of L-Se-methyselenocysteine.
Multiphoton dissociation dynamics of dimethyl selenide
作者:Joseph J. BelBruno、Jennifer Spacek、Elizabeth Christophy
DOI:10.1021/j100171a036
日期:1991.9
Dimethyl selenide photofragmentation by means of two-photon excitation through the structured, but dissociative, B1A1 state hsa been studied via multiphoton-ionization time-of-flight mass spectrometry, UV spectrophotometry, and 2 + 1 REMPI. Atomic resonances indicating the formation of Se atoms were observed, and the formation of these atoms appeared to result from competitive dissociation channels. One of these channels involved the neutral fragmentation of the parent molecule followed by ionization of the fragments, while the second was characterized by direct ionization of the dimethyl selenide with subsequent fragmentation. Estimates of the rate constants for these processes were obtained from model calculations.