We now report our observations on the synthesis of pyrano- and furoquinolines by a one-pot three-component coupling of anilines (1), benzaldehydes (2), and 3,4-dihydro-2H-pyran or 2,3-dihydrofuran (3a,b) catalyzed by nano silica
chromic acid (nano-SCA) at room temperature (Scheme 1).
Tafel plots for two electrodes were similar in H2SO4 but in
chromic acid plots were not clearly defined.
Polymer substrates were first treated with
chromic acid. Figure 3a showed the water contact angles of PC substrates after
chromic acid treatment for various time periods.
The primary objective of the current research has been to investigate the effect of thermal aging on the interphase region of FM-5 bonded to
chromic acid anodized titanium substrates.
(A) mg OC determined by
chromic acid digestion (Heanes 1984).
A very mild solution of either
chromic acid or gentian violet can be applied to the infected areas.
Although this article focuses on Cr VI, a similar process has been undertaken for Chromium Trioxide (CAS 1333-82-1) used in many surface treatments including, for aerospace applications,
chromic acid anodising.
Waste generated included ferric chloride, mineral spirits,
chromic acid rinse water and sludge,
chromic acid, sulfuric acid, trichloroethylene and tetrachloroethylene.
Reaction of
chromic acid with lignin model compounds such as guaiacol and catechol indicates that
chromic acid photostabilizes wood by reacting with lignin to create photostable lignin complexes enabling energy transfer or energy emittance from wooden surfaces.
Emergency services were alerted just after 7.30amto reports of a
chromic acid leak from a pipe in the airplane parts factory.
The Eaglescliffe site, which now employs around 118, ended production of
chromic acid and chrome sulphate and concentrates on chrome oxide and sodium dichromate.
