Acetate, determination

Recently, 2,6-dioxabicyclo[2.2.1 Jheptane 33 and 2,7-dioxabicyclo[2.2.1 Jheptane 34 were synthesized, and their rates of acidic solvolysis were compared293. Table 1 summarizes the data, along with those for relevant bicydic acetals determined in a similar manner. Tremendous differences in reactivity among these compounds are noteworthy. The approximate relative reactivities under these conditions spun more than five powers of ten. These differences are attributable to ring strain and anomeric... [Pg.59]

ISO 1600 1990 Plastics - Cellulose acetate - Determination of light absorption on moulded specimens produced using different periods of heating ISO 13468-1 1996 Plastics - Determination of the total luminous transmittance of transparent materials - Part 1 Single-beam instrument ISO 13468-2 1999 Plastics - Determination of the total luminous transmittance of transparent materials - Part 2 Double-beam instrument ISO 14782 1999 Plastics - Determination of haze for transparent materials... [Pg.179]

After cooling, add 45 mL of glacial acetic acid, and titrate the excess perchloric acid with 0.1 N sodium acetate, determining the endpoint potentiometrically. Perform a blank determination (see General Provisions), and make any necessary correction. Each milliliter of 0.1N perchloric acid is equivalent to 10.53 mg of C6H14N402 HC1. [Pg.35]

Selective deprotection of acetals—determined by the relative rate of hydrolysis as influenced by steric, inductive, and stereoelectronic effects... [Pg.72]

Biosynthetic studies feeding [l- c]- and [l,2-13c2]-acetate determined that 79 contained a tetraketide unit (Scheme 1). [Me-13C]-methionine supplied the branched carbon on the side chain and the two methoxy carbons. The origin of the remainder of the pyridone ring has yet to be established [218],... [Pg.203]

The structure-activity study of the antifeedant action of the test alkaloids showed that the C-13 and C-15 hydroxyl groups are essential features of the active molecule for S. littoralis (compounds 27 and 31), while the presence of a C-13 hydroxy and/or a C-15 acetate determined their antifeedant effect... [Pg.870]

Cohen, N., Scott, C.G., Neukom, R.J., Lopresti, G., Weber, G. and Saucy, G. (1981) Total synthesis of all eight stereoisomers of alpha-tocopheryl acetate. Determination of their diastereoisomeric and enantiomeric purity by gas chromatography. Helv. Chim. Acta 64 1158-1173. [Pg.484]

FIGURE 3.19 An integrated spectrum of benzyl acetate determined on a 300-MHz FT-NMR. [Pg.120]

ISO 1.599. Plastics Cellulose acetate Determination of viscosity lf>ss on moulding. 1990. [Pg.372]

DS/EN ISO 1597 1999 Plastics - Unplasticized cellulose acetate - Determination of acetic acid yield... [Pg.94]

Plastics - Cellulose acetate — Determination of viscosity loss on moulding Plastics - Cellulose acetate — Determination of light absorption on moulded specimens... [Pg.95]

ISO 1875 1982 Plastics — Plasticized cellulose acetate — Determination of matter extractable by diethyl... [Pg.95]

SFS-ISO 1875 Plastics. Plasticized cellulose acetate. Determination of matter extractable by diethyl ether SFS-EN ISO 2554 Plastics. Unsaturated polyester resins. Determination of hydroxyl value (ISO 2554 1997)... [Pg.98]

XLVI) have activity against W 256. The constitution of euparotin acetate was established by x-ray analysis of bromoacetate (XLVb), and the structure of eupachlorin acetate determined by conversion to euparotin acetate [190]. Eupachlorin acetate is the first example of a naturally-occurring chloro-sesquiterpene. [Pg.29]

FIA in spectroscopic methods is the most commonly used approach in studies on acetic acid and acetate determination. The determination of acetic acid/acetate employing the FIA methodology generally requires a combination of techniques to achieve good results. However, the methods used suffer severe interference from CO2 and some acids (i.e., lactate) present in the sample. [Pg.196]

If a low figure is obtained in the Bomer test a search for wo-oleic acid must be made and the melting-point of the sterol acetates determined. If these tests preclude the presence of hydrogenated oils and fats, the adulterant is beef fat (or mutton or horse fat), and an approximate measure of... [Pg.768]

Abate, determination of 261, 262 Acetate, determination of 60-62 Aliphatic amines, determination of 287-289... [Pg.489]

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