Solvent-free synthesis of benzothiazole-based quaternary ammonium salts: precursors to ionic liquids
作者:Sohail Nadeem、Munawar A. Munawar、Saeed Ahmad、Marcin Smiglak、David M. Drab、Khizar I. Malik、Rana Amjad、Chaudhry M. Ashraf、Robin D. Rogers
DOI:10.3998/ark.5550190.0011.703
日期:——
series of 13 benzothiazolium iodide salts have been prepared in solvent-free conditions by optimizing the reaction. An additional 26 benzothiazolium salts with bistrifluoromethanesulfonimide and trifluoromethylsulfonate were prepared via simple metathesis reactions from the iodide precursors. Out of a total of 39 prepared salts, 26 were identified as ionicliquids, with melting points as low as 42 o
HEMICYANIN STYRYL THIOL/DISULFIDE DYE, COMPOSITION COMPRISING HEMICYANIN STYRYL THIOL/DISULFIDE DYE, AND METHOD FOR LIGHTENING KERATIN MATERIALS USING HEMICYANIN STYRYL THIOL/DISULFIDE DYE
申请人:GREAVES Andrew
公开号:US20090211038A1
公开(公告)日:2009-08-27
The present disclosure relates to a novel dye composition for the dyeing and/or lightening of keratin materials, such dye comprising a hemicyanin styryl chromophore thiol or disulfide dye of formula (I) or (II):
the organic or mineral acid salts thereof, optical isomers and geometric isomers thereof, and the solvates thereof such as hydrates. The present disclosure further relates to a dyeing process with a lightening effect on keratin materials, in particular keratin fibers, including human keratin fibers such as the hair, using said composition. This composition makes it possible to obtain a coloring with a lightening effect which is particularly resistant and visible on dark keratin fibers.
作者:Toshio Koizumi、Nadeem Bashir、Alan R. Kennedy、John A. Murphy
DOI:10.1039/a906684e
日期:——
Diazadithiafulvalenes act as excellent electron donors to arenediazonium salts. The diazadithiafulvalenium radical cations trap primary carbon radicals successfully. However, the diazadithiafulvalenium salts which form, undergo rapid ring fragmentation in contrast to their tetrathia counterparts.
Synthesis and Evaluation of Novel Rhodacyanine Dyes That Exhibit Antitumor Activity
作者:Masayuki Kawakami、Keizo Koya、Toshinao Ukai、Noriaki Tatsuta、Akihiko Ikegawa、Keizo Ogawa、Tadao Shishido、Lan Bo Chen
DOI:10.1021/jm9702692
日期:1997.9.1
synthesized and evaluated as novel antitumor agents. Rhodacyanine dye consists of two heteroaromatic rings such as thiazoles at both termini of the conjugate systems and 4-oxothiazolidine (rhodanine) in the middle of it. Compounds with such a unique double-conjugate structure were found to inhibit the growth of several tumor cell lines, such as colon carcinoma CX-1, and to exhibit relatively low toxicity against
Alkylation of Benzothiazolines and the Stevens Rearrangement of the Resulting 2,3,3-Trisubstituted Benzothiazolinium Salts
作者:Kin-ya Akiba、Yoshio Ohara、Naoki Inamoto
DOI:10.1246/bcsj.55.2976
日期:1982.9
(3). The configuration of two alkyl groups on the nitrogen was assigned by NMR spectra and NOE measurement. In the Stevens rearrangement of 3 with lithium diisopropylamide ethyl group showed a much larger migratory aptitude (Et:Me≥20 :1) than methyl group irrespective of the configuration of 3, and cyclic ammonium ylide with planar π-type carbanion was proposed as an intermediate. 3 suffered nucleophilic