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.
Tenders are invited for Contract for treatement for neutralization of cyanide and chromic acid
based effluents and all other connected jobs as per annexure
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
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.