Mass spectra of pyrrolidine and DMOX derivatives of saturated fatty acids have less prominent molecular ions, and a base peak at m/z 113 that is the McLafferty ion, followed by ions 14 amu apart. Sign in to download full-size image Figure 9.8. Mass spectrum of picolinyl hexadecanoate. ...
The infra-red (IR) spectrum showed an OH (3536 cm−1) and one γ-lactone carbonyl peak (1761 cm−1). In the upper part of the structure of 1 (Fig. 1), the aromatic furan was characterised by 1H NMR signals at δ 6.47 (H-14), δ 7.54 (H-15) and δ 7.61 (H-16) (...
The compound in the peak at 35th fraction was separated by C18-HPLC to afford a crude compound 1. It was further purified by 12 cycles of C18-recycle HPLC and 5.5 mg of 1 as colorless amorphous was obtained (Table 1). The other compound in the peak at 28th fraction was purified by ...
The experimental results for geometric parameters and values of peak position in IR spectra have found to match excellently with the computational studies performed by GAMESS software package. Theoretically, twelve new analogs of 1 were prepared and their comparative reactivity (HOMO-LUMO energy) and ...
Our results indicated that succinimide resin with 4.08 % nitrogen content,2.51% residual chlorine content and maximal value in weight was reached by reacting 12 h,it was found stronger peak of amide carbonyl group in IR spectra at 1 640 cm-1. It showed good catalytic stability in the ...
Furthermore, FT-IR analysis of the spent catalyst showed a decrease in the carbonyl peak intensity, confirming decarboxylation on the surface of the zeolite catalyst (Fig. 3). The resonance frequency was monitored to analyze changes in the catalyst bed in real-time. The shifts in resonance ...
The structure of the obtained polymer P-1 was con- firmed by the IR and 1H NMR spectroscopy. In the IR spectrum of the polymer film, the absorption peak at 992 cmÀ1 assignable to the cyclic C–O–C stretching from oxetane ring decreased, and showed a new ap- pearance of ...
The FT-IR methyl ester spectrum gives a specific absorption peak for group C=O ester at wave number 1743 cm-1. Methyl esters are converted to diethanolamide through an amidation process. The resulting diethanolamide has an acid number of 9.7 mg KOH/g and a saponification number of 3.08 ...
For unsub- stituted polymers a single, broad peak at 1725 cm - 1 corresponding to ester carbonyl was observed. However, FT-IR spectra of this sample shows that this peak can be deconvo- luted into two peaks corresponding to hard and soft segment ester carbonyl (Figure 2b). In substituted...
The term "essentially pure" as referred to an antibiotic substance of the present disclosure, refers to substances having an HPLC titre greater than 95% (percent peak areas, at the pre-determined--254 nm--UV wavelength), a water and solvents content from 10% to 15% (by weight) and an ...