17665-72-4Relevant academic research and scientific papers
Observations on the synthesis of photochromic naphthopyrans
Gabbutt, Christopher D.,Heron, B. Mark,Instone, Alicia C.,Thomas, David A.,Partington, Steven M.,Hursthouse, Michael B.,Gelbrich, Thomas
, p. 1220 - 1230 (2007/10/03)
1-Naphthol reacts with 1,1-diarylprop-2-yn-1-ols 5a,b, under alumina catalysis, by two pathways to give the photochromic naphtho[1,2-b]pyrans 6a,b, together with the propenylidenenaphthalenones 7a,b, representatives of a new class of merocyanine dyes. With 2-methyl-1-naphthol, formation of the photochrome is suppressed; the only products are merocyanines 7c,d. The cyclocondensation of 2-naphthol with 5a,b proceeds much more efficiently, to give the naphtho[2,1-b]pyrans 14a,b. Pyran formation is not suppressed from either 1-bromo- or 1-(4 -methoxyphenyl)-2-naphthol; reaction with 5a,b merely results in expulsion of the C-1 substituent. An alternative pathway supervenes in the reaction of 1-methyl-2-naphthol with 5a to give the benz[e]indanone 17, the constitution of which was determined by X-ray crystallography. Reaction of the 1,3,3-triarylpropynols 19a,b with 1-naphthol affords the naphthopyrans 20 together with merocyanines 21, whilst the isomeric pyrans 23 are efficiently produced from 2-naphthol. The configuration of merocyanines 7a and 21a was unequivocally established by X-ray crystallography. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
Polymethine dyes suitable for optical recording media
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, (2008/06/13)
Polymethine dyes suitable for use in optical recording medium, which are soluble in alcohol and have a nucleus of the general formula: in which:, n is 0 or an integer,R1 and R2 independently represent alkyl groups of up to 30 carbon atoms with the proviso that either at least one of R1 and R2 contains more than 4 carbon atoms or R1 and R2 together represent the necessary atoms to complete a cyclic structure including the nitrogen atom to which they are attached,each Y is the same and represents a hydrogen atom, an alkoxy group of up to 12 carbon atoms or a dialkylamino group which is different to the group,and, X?represents an anion.
1,1,4,4-tetraphenyl-1,3-butadiene derivative and electrophotographic light-sensitive material using the same
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, (2008/06/13)
A 1,1,4,4-tetraphenyl-1,3-butadiene derivatives represented by formula (I): STR1 wherein R1 represents a di-lower alkylamino group, and R2 represents a hydrogen atom or a di-lower alkylamino group, is disclosed, which has useful characteristics such as excellent static charge retention ability. An electrophotographic light-sensitive material using the foregoing derivative can satisfy the requirements, e.g., for high sensitivity, low residual potential, less light fatigue even after repeated use, and excellent durability.
Thermal Cycloaddition Reactions of ?-Delocalized Singlet Vinylcarbenes: Three-Carbon 1,1-/1,3-Dipoles. The Thermal Three-Carbon + Two-Carbon Cycloaddition
Boger, Dale L.,Wysocki, Ronald J.
, p. 3408 - 3421 (2007/10/02)
Full details of investigations defining new aspects of the scope and mechanism of the three-carbon + two-carbon cycloaddition reaction of ?-delocalized singlet vinylcarbenes (three-carbon 1,1-/1,3-dipoles generated in a reversible, thermal ring opening of cyclopropenone ketals) are detailed.
