FFAP

If V(R) is known and the mahix elements ffap ate evaluated, then solution of Eq. nO) for a given initial wavepacket is the numerically exact solution to the Schrddinger equation. 

The purity of the product was determined by the checkers by GLC analysis using the following column and conditions 3-nm by 1.8-m column, 5% free fatty acid phase (FFAP) on acid-washed chromosorb W (60-80 mesh) treated with dimethyldichlorosilane, 90 C (1 min) then 90 to 200 C (15°C per rain). The chromatogram showed a major peak for methyl 2-methyl-l-cyclohexene-l-carboxylate preceded by two minor peaks for methyl 1-cyclohexene-l-carboxylate and l-acetyl-2-methylcyclohexene. The areas of the two impurity peaks were 5-6% and 0.5-2% that of the major peak. The purity of the product seems to depend upon careful temperature control during the reaction. The total amount of the two impurities was 14-21% in runs conducted at about -15 to -20°C or at temperatures below -23°C. 

The submitters state that the distilled product was about 97% pure as shown by GLC analysis on a 6.4-nm x 1.4-m column packed with 15% FFAP on Chromosorb W, 60-80 mesh and operated at HC C. The retention time Is about... 

Benzene, propyl acetate, allyl acetate, 1-pentanol, cyclohexanone, cyclohexanol, dicyclohexyl ether, cyclohexyl valerate, butyric acid, valeric acid, caproic acid, 1,5-pentanediol, dicyclohexyl succinate, and dicyclohexyl glutarate 30 m DB-FFAP column, 60-200° at 67min. 

Superox FA FFAP-CB HP-FFAP DB-FFAP 007-FFAP Stabilwax DA BP-21 NUKOL 220°... 

General conditions for separation of amides 30 m FFAP-DB column, 80-220° at 127min. 

The products of the oxidation reaction were analysed by gas chromatography (Hewlett Packard, 5880 A), employing a FID detector and equipped with a capillary column (50 m x 0.25 mm crosslinked methyl silicone gum). The reactants and products of n-hexane oxidation were analysed by gas chromatography (Hewlett Packard, 5890) equipped with a FFAP column (30 m X 0.25 mm). The identity of the products was further confined by GC-MS (Shimadzu QCMC-QP 2000A). 

For gas-chromatographic analysis, orbencarb and I are detected with good peak shapes with a column using as liquid phases silicone SE-30, Thermon-3000, FFAP and PEGA, but NPGS is superior for separation from impurities. 

If interfering peaks hinder sample quantitation on the gas chromatogram, better resolution could be obtained by using an FFAP or DB-17 gas chromatographic column. 

FFAP A teflon-based material Highly polar... 

Column packed, 3% FFAP, 2 m in length Carrier gas flow rate 20 mL per min... 

Chromosorb is the trade name given to diatomaceous earth, the decayed silica skeletons of algae. It is the substrate material on which the liquid stationary phase is adsorbed in packed columns. Low-molecular-weight alcohols are highly polar, thus FFAP or Casterwax would be useful in their separation. 

The oxidation of n-octane and the epoxidation of 1-hexene were performed in a 25 ml Parr reactor using 30% aqueous H2O2 as an oxidant and acetone as solvent at 100 °C and 80 °C, respectively and stirred at 500 RPM. Prior to product analysis, the product mixtures were diluted with acetone in order to obtain a single liquid-phase. The products were analyzed on a HP 5890 Series II GC equipped with a 25 m long HP-FFAP (polar) capillary column. 

GC and GC-MS Analyses. The concentrated extracts were analyzed on an Intersmat IGC 120F gas chromatograph with an ICR IB integrator using an SGE FFAP quartz capillary column (free fatty acid phase, 50 m x 0.22 mm i.d.) injection temperature 250°C, oven temperature 60°C for 8 min, operating temperature 230°C (temperature gradient 2°C/min). 

Examples of aldehydes used to obtain the respective heterocycles are mentioned directly in the text. This work. KIP values are Kovdts indices on a polar column (FFAP) the values in parentheses are estimates based on additivity of index increments. Base peak and main fragments. Unless indicated otherwise, the mass spectra were obtained in this work and are in agreement with the literature data (see the ref.). %ot reported. Literature data. First isomer. Second isomer. Found by Ledl (33) after the reaction of acetaldehyde with hydrogen sulfide. 

The influence of the sensitivity of the assessors on AEDA has been studied [11], with the result that the differences in the FD factors determined by a group of six panellists amount to not more than two dilution steps (e.g. 64 and 256), implying that the key odorants in a given extract will undoubtedly be detected. However, to avoid falsification of the result by anosmia, AEDA of a sample should be independently performed by at least two assessors. As detailed in [6], odour threshold values of odorants can be determined by AEDA using a sensory internal standard, e.g. ( )-2-decenal. However, as shown in Table 16.6 these odour threshold values may vary by several orders of magnitude [8] owing to different properties of the stationary phases. Consequently, such effects will also influence the results of dilution experiments. Indeed, different FD factors were determined for 2-methyl-3-furanthiol on the stationary phases SE-54 and FFAP 2 and 2 , respectively. In contrast, 5-ethyl-3-hydroxy-4-methyl-2(5H)-furanone showed higher FD factors on FFAP than on SE-54 2 and 2, respectively. Consequently, FD factors should be determined on suitable GC capillaries [8]. However, the best method to overcome the limitations of GC-O and the dilution experiment is a sensory study of aroma models (Sect. 16.6.3). 

Column packing WG 11 (FFAP) Column temp. isothermic 100 °C ... 

A pentane (450 mL) solution of 5.6-dimethylenebicyclo[2.2.1]heptan-2-one was degassed at 20 "C with dry N2 for 30 min. After cooling to — 30 C, the stirred solution was irradiated (253.7 nm, Hanau TNN 15/32) in a quartz vessel for 24 h. The slightly yellow solution contained starting material ( 28%), 2,3-dimethylenebicyclo[2.1.1]hexane (26%) and polymers (46%, partially precipitated at — 30 C). The solution was concentrated by distillation. The residue was combined with four other residues obtained under the same conditions. Distillation afforded the crude diene yield 490-500mg (36% based on reacted ketone) bp 80 C/2 Torr. The diene was purified by preparative GC (FFAP 10% or SE 30 10% on WAW Chromosorb, 60/80 mesh). 

A gas chromatograph of the Hewlett-Packard 5890 series with a HP 7673A injector and a flame ionisation detector can be used. A capillary free fatty acid phase (Hewlett-Packard FFAP 19091F-105) column (50 m x 0.20 mm x 0.33 pm) is cut into two equal 25-m lengths, which are used for the separation, provided that a capillary pre-column (J W Scientific Altech 93493) with a 50% phenyl silicone DB 17 coating (1.35 m of a 15 mx0.25 mmx0.25 pm column) is installed. 

Separated by preparative GLC on a column using 5% FFAP on Chromosorb G. [Lewis et al. JACS 108 2818 19861. 

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