Separation and Identification of Volatile Components in the Fermentation Broth of Trichoderma atroviride by Solid-Phase Extraction and Gas Chromatography--Mass Spectrometry
作者:A. Keszler、E. Forgacs、L. Kotai、J. A. Vizcaino、E. Monte、I. Garcia-Acha
DOI:10.1093/chromsci/38.10.421
日期:2000.10.1
A preseparated fermentation broth of Trichoderma atroviride strain 11 is analyzed by gas chromatography followed by mass-spectral detection using a FinniganMAT GCQ apparatus. After preseparation in a C18 and a silica gel column, nineteen pyrone and dioxolane derivatives and two aliphatic esters are obtained, respectively. Among these, the four dioxolane derivatives have not been identified previously
通过气相色谱分析随后分离的阿魏木霉菌株11的发酵肉汤,然后使用Finnigan MAT GCQ仪器进行质谱检测。在C18和硅胶柱中进行预分离后,分别获得十九个吡喃酮和二氧戊环衍生物以及两种脂族酯。其中,四种二氧戊环衍生物先前尚未鉴定。发现主要成分为5,5'-二甲基-2H-吡喃-2-on。用于确定保留时间和峰面积(以离子数测量)的相对标准偏差分别为0.1%和4.5%。
Modular Asymmetric Synthesis of 1,2-Diols by Single-Pot Allene Diboration/Hydroboration/Cross-Coupling
作者:Nicholas F. Pelz、James P. Morken
DOI:10.1021/ol0616891
日期:2006.9.1
Chiral allyl vinyl boronates are generated by catalytic enantioselective diboration of prochiral allenes. They may then be reacted, in situ, with a hydroborating reagent to form a novel triboron intermediate. The least hindered and most reactive C-B bond then participates in cross-coupling wherein the coupling is brought about by the same catalyst as that which catalyzed the diboration reaction. The
Preparation and Reactions of Optically Active 4-Hydroxy-1,3-dioxolanes: 2-Hydroxy Aldehyde Equivalents
作者:Hwa-Ok Kim、Dirk Friedrich、Ed Huber、Norton P. Peet
DOI:10.1080/00397919608003750
日期:1996.9
Abstract The preparation and reactions of optically and chemically stable (S)-4-hydroxy-1,3-dioxolane 3 as a 2-hydroxy aldehyde equivalent were explored. Hydroxydioxolane 3 was prepared by reduction of ketodioxolane 2 which was obtained from (S)-2-hydroxycarboxylic acid 1. The reactions of 3 with triethyl phosphonoacetate and organometallic reagents were carried out. These and other conversions gave