Extremely stable carbocations, tris(6-methoxy-1-azulenyl)methyl, bis(6-methoxy-1-azulenyl)(4-methoxyphenyl)methyl, and (6-methoxy-1-azulenyl)bis(4-methoxyphenyl)methyl cations were prepared and their pKR+ values were determined spectrophotometrically as >14.0, >14.0, and 13.2, respectively. The extreme stability of these methyl cations are attributable to dipolar structures of azulene rings in addition
Push-pull azulene-based chromophores with nonlinear optical properties
作者:Gabriel Iftime、Pascal G. Lacroix、Keitaro Nakatani、Alexandru C. Razus
DOI:10.1016/s0040-4039(98)01495-6
日期:1998.9
A new chromophore 6-methoxy-1-[2-(4-nitrophenyl)ethenyl]-azulene was synthesized and tested for the Second Harmonic Generation (SHG) in solid state by the Kurtz powder technique. This compound was sis times more efficient (58 times than the urea standard) than the unsubstituted compound 1-[2-(4-nitrophenyl)ethenyl]-azulene (10 times than the urea). (C) 1998 Elsevier Science Ltd. All rights reserved.
Synthesis and Properties of Extremely Stable Tris(6-methoxy-1-azulenyl)methyl Cation and a Series of Di(1-azulenyl)phenylmethyl and (1-Azulenyl)diphenylmethyl Cations Stabilized by Methoxy Substituents
tris(6-methoxy-1-azulenyl)methyl (8), bis(6-methoxy-1-azulenyl)(4-methoxyphenyl)methyl (9a), and (6-methoxy-1-azulenyl)bis(4-methoxyphenyl)methyl (10a) cations and a series of di(1-azulenyl)phenylmethyl and (1-azulenyl)diphenylmethyl cations having methoxy substituents on each phenyl group, i.e., di(1-azulenyl)(4-methoxyphenyl)methyl (9b) and (1-azulenyl)bis(4-methoxyphenyl)methyl (10b) cations and 3-methyl-1-azulenyl