Detail of "6089-09-4"

Reference

Metal complexation in the synthesis of medium-ring acetylenic lactones

Metal complexation in the synthesis of medium-ring acetylenic lactones. Najdi, Samir D.; Olmstead, Marilyn M.; Schore, Neil E. (Dep. Chem., Univ. California, Davis, CA 95616, USA). J. Organomet. Chem., 431(3), 335-58 (English) 1992. CODEN: JORCAI. ISSN: 0022-328X. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) Section cross-reference(s): 27, 75 The hexacarbonyl dicobalt complexes, e.g., I, of several appropriately designed acetylenic lactone precursors have been prepd., and lactones, e.g., II, contg. Co2(CO)6-complexed triple bonds in seven-, ten-, and eleven-membered rings obtained. The latter were best obtained through a retro-Dieckmann fragmentation of 2-(hydroxybutynyl) derivs. of 1,3-cyclohexanedione. Attempts to extend this reaction to cyclohexanones bearing other anion-stabilizing groups in the 2-position or to 1,3-cyclopentanediones were unsuccessful. 6089-09-4 which is the cas registry number is also used here. Decomplexation afforded the metal-free 11-ring lactone III, characterized crystallog. Treatment of this system with basic reagents led to dimerization. In the case of the smaller rings, cyclization of the complexed acetylenic hydroxy acids under Mukaiyama conditions (2-chloro-N-methylpyridinium iodide, CH2Cl2, reflux) succeeded in modest yields. .

Synthesis and chain helicity of a poly(1-butyne) containing L-leucine (1S,2R,5S)-(+)-menthyl ester pendants

Synthesis and chain helicity of a poly(1-butyne) containing L-leucine (1S,2R,5S)-(+)-menthyl ester pendants. Lai, Lo Ming; Lam, Jacky Wing Yip; Tang, Ben Zhong (Department of Chemistry, Center for Display Research, Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Hong Kong, Peop. Rep. China).There are some reagents like 6089-09-4 is used in this study. PMSE Preprints, 93, 569-570 (English) 2005 American Chemical Society. CODEN: PPMRA9. ISSN: 1550-6703. DOCUMENT TYPE: Journal; (computer optical disk) CA Section: 35 (Chemistry of Synthetic High Polymers) Poly(1-butyne) with L-leucine (1S,2R,5S)-(+)menthyl ester pendants is prepd. by rhodium catalysts and has Mw ￡2.7 x 104 in satisfactory yields. The polymer shows intense backbone CD bands in THF and toluene indicating that the main chain is chiral owing to a predominant helical screw sense. .