was very successful. Although the recovery percentage is small (8.07%), but the fact is that is alkaloids represent 9% of the total mass of the pepper, doesn’t appear to be a big deal . In addition, the NMR was helpful in identifying different hydrogens but with uncertainty. That’s why a 400 NMR was needed. To improve the results in the future, a nitrogen stream should be used to dry the product to eliminate any H2O contaminant. Also, an increase in the time of the refluxing process would produce
which contains both S and R-isomers.7 The S-isomer is active as it is attached to four different compounds meanwhile the R-isomer is inactive. The chiral center of the S-isomer is the sulfur which is located in the middle of the compound bonded to two carbon atoms on either side of the sulfur. The sulfur also has a double bonded oxygen atom, and two lone pairs of electrons indicating that it has a tetrahedral bond angle hence chirality.11 Figure 2: The structure of esomeprazole magnesium trihydrate
and Kealy, as they were trying to make fulvalene. More generally, these compounds can be classified as sandwich complexes. In a sandwich complex the metal centre lies between two pi bonded ligands. The metal centre in ferrocene is bonded to all 5 carbon atoms of the Cp ligand. To prepare ferrocene, the cyclopentadienyl
of the pyrrole, 2,4-diethoxycarbonyl-3,5-dimethylpyrrole, was achieved using an α-amino ketone, ethyl acetoaminoacetate and reacting it with its predecesso r, ethyl acetoacetate in a double condensation reaction . The product was analysed by 1H NMR, 13C NMR, mass spectrometry and IR spectroscopy giving positive results . Introduction Pyrrole has been a molecule of great interest due to its heterocyclic aromatic properties. The lone pair on the nitrogen is delocalised within the ring, causing the
Chapter-2 Efficient ZnO NPs catalyzed Friedlander annulations in the synthesis of diverse quinolin-2(1H)-ones 2.1.1 INTRODUCTION OF QUINOLINONES AND QUINOLINES The quinolinone and quinoline ring is highly prevalent in natural compounds. There are synthetic and potential agents, which show various pharmacological properties (Priya et al., 2012). Quinolinones are important structural intermediates for synthesis of functionalized quinolines (Baston et al., 2000). Quinolines have demonstrated various
NASA's Contribution to Technological Advances on Earth Abstract NASA is more than just a space administration; it shows itself everyday in the world although at first it might not be apparent. There are not many people that know the variety of what it has brought to everyday life. NASA is not limited to just aerospace technology. The three main fields of development have been medical, environmental and consumer products. Each field is equally important to technological development. NASA’s
Castor oil is one of the most versatile plant oils. The various grades of the oil and its derivatives are currently used in over a dozen diverse industries. In future, with the rising environmental concerns and the need for bio-based products to replace synthetic feedstocks, castor oil and castor oil oleochemicals have the potential to be used in many newer industries, Many derivatives and oleochemicals of castor oil require relatively simple methods for their production, while higher generation
Chlorine is a greenish yellow gas which combines directly with nearly all elements. Chlorine is a respiratory irritant. The gas irritates the mucous membranes and the liquid burns the skin. As little as 3.5 ppm can be detected as an odour, and 1000 ppm is likely to be fatal after a few deep breaths. It was used as a war gas in 1915. It is not found in a free state in nature, but is found commonly as NaCl (solid or seawater). Table: basic information about and classifications of chlorine. • Name: