Detail of "2870-38-4"

Reference

Benzoselenazole monomethinecyanines

Benzoselenazole monomethinecyanines. Ezekiel, Aaron David (Ciba-Geigy A.Several substances are used for example 66935-08-8 which is its cas registry number.-G., Switz.). Brit. GB 1495048 14 Dec 1977, 4 pp. (English). (United Kingdom). CODEN: BRXXAA. CLASS: IC: C09B023-04. APPLICATION: GB 75-10930 17 Mar 1975. DOCUMENT TYPE: Patent CA Section: 40 (Dyes, Fluorescent Whitening Agents, and Photosensitizers) Section cross-reference(s): 74, 28 The prepn. is described of the title compds. I (R, R3 = lower alkyl; R1, R5 = H, Cl, Br, lower alkyl, lower alkoxy, optionally substituted Ph; R2, R4 = H, Cl, Br, lower alkyl, lower alkoxy; X- = anion), useful as blue light sensitizers for photog. material. Thus, I (R = Me, R1 = R2 = R4 = H, R3 = Et, R5 = OMe, X- = iodide) [66935-08-8] was prepd. by refluxing 3-methyl-2-(methylthio)benzoselenazolium toluene-p-sulfonate [62667-39-4] with 3-ethyl-5-methoxy-2-methylbenzoselenazolium iodide [2870-38-4] in EtOH, and boiling the resulting soln. with Et3N for 0.5 h. Ten I were prepd. and tested as optical sensitizing dyes in a photog. emulsion. .Except for chemicals metioned above, 66935-08-8 is also used..