Detail of "24398-88-7"

Reference

Unidirectional Cis-trans photoisomerization of cis-3,3'-bis(diphenylhydroxymethyl)stilbene in inclusion complex crystals

Unidirectional Cis-trans photoisomerization of cis-3,3'-bis(diphenylhydroxymethyl)stilbene in inclusion complex crystals. Tanaka, Koichi; Hiratsuka, Takaichi; Ohba, Shigeru; Naimi-jamal, M. Reza; Kaupp, Gerd (Department of Applied Chemistry, Faculty of Engineering, Ehime University, Ehime 790-8577, Japan). Journal of Physical Organic Chemistry, 16(12), 905-912 (English) 2003 John Wiley & Sons Ltd. CODEN: JPOCEE. ISSN: 0894-3230. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Section cross-reference(s): 74, 75 When a 1:1 complex of cis-3,3'-bis(diphenylhydroxymethyl)stilbene (1) with acetone was irradiated in the solid state at room temp. using a high-pressure mercury lamp with a Pyrex filter for 6 h, a 1:1 complex of the trans-isomer (2) with acetone was obtained without losing the guest acetone mols. Similar results were obtained without a guest or in the presence of other guests. Internal rotation around the double bond bearing the very large triphenylhydroxymethyl substituent is hardly imaginable in the confinement of the crystal. Therefore, the geometrically easier "hula-twist" (HT) mechanism with its movements primarily in the mol. plane provides a viable mechanistic alternative for the cis-trans isomerization. The solid-state mechanism of the reaction was studied by x-ray and at. force microscopy (AFM) analyses. Face-selective efflorescence formed a protective cover on (100) and can be related to the crystal structure. Further mol. migration was not detected with the sensitivity of AFM and the crystal of 1×acetone did not lose its clarity and microscopic shape. The cis-trans conversion profits from cages that are present in the crystal lattice. X-ray structural anal. confirmed a strong loss of crystallinity upon the photochem.In this experiment, several chemicals are used like 651724-15-1 and 24398-88-7 conversion of 1×acetone which precludes a definitive conformational proof of HT by x-ray diffraction. The formation of the amorphous phase excludes a topotactic reaction. .

Features of the polarographic reduction of some aromatic halo-derivatives in an aprotic medium

Features of the polarographic reduction of some aromatic halo-derivatives in an aprotic medium. Reishakhrit, L. S.; Argova, T. B.; Veshcheva, L. V.; Kartuzova, L. T.; Temnikova, T. I. (Leningr. Gos. Univ. im. Zhdanova, Leningrad, USSR). Nov. Polyarogr., Tezisy Dokl. Vses. Soveshch. Polyarogr., 6th, 27. Edited by: Stradins, J. "Zinatne": Riga, USSR.There are some commonly used reagents with their cas registry numbers 24398-88-7 and 2001-29-8 in this article. (Russian) 1975. CODEN: 34DIA8. DOCUMENT TYPE: Conference CA Section: 72 (Electrochemistry) Section cross-reference(s): 22, 25 PhCOCH2Ph and BzOEt substituted by Cl and Br in 3- and 4-positions give 3 diffusion waves in the polarog. redn. in DMF. The redn. of the halogen-carbon bond precedes the redn. of the carbonyl group. .