Polyacetylenverbindungen, XVIII. Mitteil.: Über die Lichtabsorption von Polyin‐Carbonsäurenitrilen

Abstract

Es werden einige Polyin‐Nitrile dargestellt und ihre UV‐ und IR‐Spektren gemessen. Es ergibt sich, daß die CN‐Bindung in ihrem spektralen Verhalten weitgehend der CC‐Bindung entspricht.

Low Temperature Synthesis and Phosphorescence of Methylcyanotriacetylene

“…bottom) presents the relevant system of bands identified as due to CH 3 C 7 N. A UV absorption feature reported by Bohlmann31 for an ether solution of CH 3 C 7 N (centered at 44 740 cm -1 ), remains in reasonable agreement with present data. The first strong band of the excitation spectrum is located at 43 150 cm -1 (5.35 eV or 231.7 nm), very close to the predicted origin of ‫ܧ‬ 1 A 1 -ܺ 1 A 1 transitions (5.40 eV, see…”

“…Vibrational frequencies computed for the selected electronic states (of interest to the analysis of IR spectra or of vibronic features) are collected in Table . The only available IR absorption spectrum of CH 3 C 7 N was measured over 60 years ago by Bohlmann and Mannhardt for a CCl 4 solution; digitization of the published figure points to band maxima at approximately 2290, 2240, 2210, and 2190 cm –1 . Our DFT results predict two very intense IR transitions, ν 3 and ν 4 , at, respectively, 2208 and 2187 cm –1 , i.e., matching the two of those observed.…”

“…The first report to mention CH 3 C 7 N (methylcyanotriacetylene, 6-methyl-1-cyanohexa-1,3,5-triyne, octa-2,4,6-triynenitrile) discussed its difficult synthesis, and provided infrared, as well as UV absorption spectra (for an ether solution) . Microwave transitions were subsequently investigated. ,, Theoretical results are available for rotational constants, molecular geometry, polarizability, and electric dipole moment. , …”

Agrocybynes A–E from the culture broth of Agrocybe praecox

“…Although this compound has been synthesized, this is its first reported isolation from a natural source. 12,13 Agrocybyne E (5) We are now trying to synthesize these compounds and planning cultivating experiments of strawberry fruits using them.…”

N-(3-Cyanoprop-2-ynyl)carbazole: synthesis, crystal structure, and solid-state reactivity

“…Initially colorless, they darken in light, but no products were characterized. 7 The first cyanoalkyne chosen for study is the new compound N-(3-cyanoprop-2-ynyl)carbazole (1), which was synthesized by reaction of N-(3-bromoprop-2-ynyl)carbazole (2) 8 with CuCN in tetrahydrofuran (THF ), or by the reaction of lithiated prop-2-ynylcarbazole with 1-cyanobenzotriazole.…”