Reference

Occurrence of a High Concentration of Spider Pheromones in the Ascomycete Fungus Hypoxylon truncatum

Occurrence of a High Concentration of Spider Pheromones in the Ascomycete Fungus Hypoxylon truncatum. Quang, Dang Ngoc; Hashimoto, Toshihiro; Toyota, Masao; Asakawa, Yoshinori (Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan). Journal of Natural Products, 66(12), 1613-1614 (English) 2003 American Chemical Society.There are some reagents with their cas registry numbers 3976-69-0 and 1117-10-8 are used in this study. CODEN: JNPRDF. ISSN: 0163-3864. DOCUMENT TYPE: Journal CA Section: 10 (Microbial, Algal, and Fungal Biochemistry) A large amt. of sex pheromones of the European spider Linyphia triangularis, 3R-hydroxybutyric acid (1), its dimer 3R-(3R-hydroxybutyryloxy)butyric acid (2), and trimer 3R-[3R-(3R-hydroxybutyryloxy)butyryloxy]butyric acid (3) were isolated from the EtOAc ext. of the Japanese inedible mushroom Hypoxylon truncatum. .

Enantio-differentiating hydrogenation of methyl acetoacetate over modified Raney nickel catalysts prepared by two-step modifications

All Rights Reserved. Enantio-differentiating hydrogenation of methyl acetoacetate over modified Raney nickel catalysts prepared by two-step modifications. Osawa, Tsutomu; Yoshino, Kenji; Takimoto, Kosuke; Takayasu, Osamu; Harada, Tadao (Faculty of Science, University of Toyama, Gofuku, Toyama 930-8555, Japan).Some commonly used reagents like 3976-69-0 and 7647-15-6 are used in this experiment. Catalysis Letters, 112(3-4), 167-171 (English) 2006 Springer. CODEN: CALEER. ISSN: 1011-372X. DOCUMENT TYPE: Journal CA Section: 45 (Industrial Organic Chemicals, Leather, Fats, and Waxes) Section cross-reference(s): 23 Two-step modifications of Raney nickel were examd. for the enantio-differentiating hydrogenation of Me acetoacetate. The combination of pre-modification with disodium tartrate and NaBr in water and in-situ modification with tartaric acid resulted in the highest optical yield (84%) of hydrogenation product. This modification process is greener [environmentally benign] process than conventional modification carried out under weakly acidic conditions, because this process generated almost no Ni2+ ions. The pre-modification with tartrate and NaBr preferentially eliminated Al3+ from Raney nickel surface. .