Reference

Formation of a discrete helical assembly and packing pattern through charged hydrogen bonds and van der Waals interactions

All Rights Reserved. Formation of a discrete helical assembly and packing pattern through charged hydrogen bonds and van der Waals interactions. Lee, Ho Yong; Kim, Hae-Jo; Lee, Kyoung Jae; Lah, Myoung Soo; Hong, Jong-In (Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-747, S. Korea). CrystEngComm, 9(1), 78-83 (English) 2007 Royal Society of Chemistry. URL: http://www.rsc.org/ej/CE/2007/b610512b.pdf. CODEN: CRECF4. ISSN: 1466-8033. DOCUMENT TYPE: Journal; (online computer file) CA Section: 22 (Physical Organic Chemistry) Section cross-reference(s): 75 The authors report the selective formation of a self-assembled discrete helical assembly with handedness through charged hydrogen bonds in aq. soln. and solid state. A helical assembly is obtained by simply mixing tris(imidazoline) (1) and (rac)-trans-cyclohexane-1,2-dicarboxylic acid (2) in a 2: 3 ratio in water and methanol. The formation of an ion aggregate is fully supported by NMR, MALDI-TOF mass spectroscopy, and x-ray anal. Helicity of the 2: 3 complex is detd. by the chirality of 2. For example, (1R,2R)-trans-cyclohexane-1,2-dicarboxylic acid (2RR) induces M helicity in [12×23] and vice versa. Each complex is enantiomerically pure as equal amts.In this experiment, several chemicals are used like 204689-15-6 and 2305-32-0 of the P and M helical complexes are formed with racemic 2. P- and M-helical assemblies are stacked by turns because PMPM stacking is denser than PP or MM stacking. .

Iodopropargylcarboxylic acid esters

Iodopropargylcarboxylic acid esters. Maurer, Fritz; Brandes, Wilhelm; Reinecke, Paul (Bayer A.-G. , Fed. 2305-32-0 and 3668-43-7 are also occured in this study. Rep. Ger.). Ger. Offen. DE 3227220 A1 2 Feb 1984, 20 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C07C069-74; C07C069-75; C07C067-14; A01N037-08. APPLICATION: DE 82-3227220 21 Jul 1982. DOCUMENT TYPE: Patent CA Section: 24 (Alicyclic Compounds) Section cross-reference(s): 5 ICYCCH2O2CZCO2CH2CYCI [Z = (un)substituted cycloalkylene] were prepd. and shown to be better fungicides than, e.g., Zn ethylenebis[dithiocarbamate]. Thus, trans-3,3-dimethyl-1,2-cyclopropanedicarboxylic acid was treated with SOCl2 to give the diacid dichloride, which with ICYCCH2OH gave the ester I. The unsubstituted C4 and C6 analogs, and the substituted C5 analog II were also prepd. .