Reference

Spectrophotometric determination of ferric ions by 2,6-dihydroxyacetophenone and 2,4,6-trihydroxyacetophenone

Spectrophotometric determination of ferric ions by 2,6-dihydroxyacetophenone and 2,4,6-trihydroxyacetophenone. Desai, M. N.; Desai, B. M.; Gandhi, M. H. (Univ. Sch. Sci., Gujarat Univ., Ahmedabad, India). J. Inst. Chem. (India), 48, Pt. 4, 178-9 (English) 1976. CODEN: JOICA7. DOCUMENT TYPE: Journal CA Section: 79 (Inorganic Analytical Chemistry) Section cross-reference(s): 68 Fe(III) was detd. spectrophotometrically by measuring the absorbance of its 1:1 complex with 2,6-dihydroxyacetophenone (I) (at pH 2.3-2.6) or 2,4,6-trihydroxyacetophenone (II) (at pH 2.7-2.95) at 500 or 510 nm, resp. (molar absorptivity 8.25 .times. 102 or 1.25 .times. 103, resp.). 7439-89-6 and 699-83-2 are cas registry numbers of chemicals which are used as reagents here. Beer's law was obeyed for 1.0-56.0 ppm Fe. The stability consts. are 1.46 .times. 103 and 1.63 .times. 103 and the Sandell sensitivities are 1.12 and 0.84 .mu.g Fe/cm2 with I and II, resp. Citrate, oxalate, F-, and PO43- interfere. II is a more selective reagent than I. The method was used to det. Fe in an iron ore. .

Regioisomeric acetoxy derivatives of 8-aza-D-homogona-12,17a-dione

Regioisomeric acetoxy derivatives of 8-aza-D-homogona-12,17a-dione.Several substances are used for example 254888-58-9 and 699-83-2 which are their cas registry numbers. Annelation of 1-methyl-3,4-dihydro-isoquinoline with 4-acetoxy-2-acetylcyclohexane-1,3-dione. Gulyakevich, O. V.; Zaitsev, V. G.; Mikhal'chuk, A. L. (Institute of Bioorganic Chemistry, National Academy of Sciences, Minsk 220141, Belarus). Chemistry of Heterocyclic Compounds (New York, NY, United States)(Translation of Khimiya Geterotsiklicheskikh Soedinenii), 40(3), 315-319 (English) 2004 Kluwer Academic/Consultants Bureau. CODEN: CHCCAL. ISSN: 0009-3122. DOCUMENT TYPE: Journal CA Section: 27 (Heterocyclic Compounds (One Hetero Atom)) Section cross-reference(s): 32 Annelation ([2+4] cyclocondensation) of 1-methyl-3,4-dihydroisoquinoline with 4-acetoxy-2-acetylcyclohexane-1,2-dione leads to a mixt. of regioisomeric acetoxy derivs. of 9-methyl-8-aza-D-homogona-12,17a-dione. The reaction is stereoselective, as only the 9,17 and 9,15 trans (4; shown as I) diastereomers of the acetoxy derivs. are isolated. .