Page 1 of 16 - About 154 Essays
  • Advantages And Disadvantages Of Tri-O-Acetyloride

    and Morin, 1980), acid chlorides (Mishra and Misra, 1986, and references therein), or alkyloxycarbonylbenzotriazoles (Himmelsbach et al., 1984). (5) Site-selective incorporation and removal of N-acyl protecting groups have also been achieved by enzymatic methods (Prasad and Wengel, 1996). (6) Selective acylation of nucleosides has also been carried out by N-acyltetrazole (Bhat et al., 1998) and carboxylic acids activated in situ with carbonyldiimidazole (Sinha et al., 1995). (7) N-Benzoyltetrazole has been developed as a mild and selective reagent for the monobenzoylation of the exocyclic amino groups in adenine and cytosine nucleobases (Bhat et al., 1997). In a related report, 1-acetyl-4-nitrobenzotriazole readily acetylated the exocyclic amine of cytidine (Reid et al., 2006). This one step-strategy is…

    Words: 1630 - Pages: 7
  • Formation Of Carboxylic Acid Group

    Thus, a successful surface modification with amino groups can be confirmed by the coexistence of bands at about 3200, 1650 and 1150 cm−1, which means it corresponded to the N–H, –C(=O)–N–H secondary amine bond and C–N–C secondary amine moiety, respectively. The formation of the secondary amine bond may be attributed to the attachment between amine groups and the carboxyl groups 13,14. Moreover, as it is revealed by the FT-IR spectra, the copolymers showed no absorption in the characteristic C=C…

    Words: 2030 - Pages: 9
  • Analysis Of Apricot

    Raw material: Two sweet varieties of Apricot (Prunus Armeniaca L.) namely Marghulam and Halman fully ripened fruits were collected from Gilgit Baltistan region in Northern Areas of Pakistan. Apricots were sun dried under open condition (26-34+4 C, RH 41-52%) for 16-19 days. The sun dried Apricots were packed in polyethylene bags containing 01Kg of dried fruit. Further The dried samples obtained were ground to a fine powder and stored at 5°C in air-tight containers prior to further analysis.…

    Words: 1299 - Pages: 6
  • Broiler Chickenss: A Case Study

    The aim of this paper was model the amino acid intake of broiler chickens for optimum economic in different scenarios with MC how to example. The second objective was described in software R the scripts for modeling the optimum amino acid intake for broiler. In addition, we considered the price of whole birds and DL-methionine cost according to Economic scenario. The dilution technique was used to allow formulates the experimental diets with the same balance of amino acids for all treatments…

    Words: 1263 - Pages: 5
  • Friedel-Crafts Synthesis Of Glyoxylates

    We were further interested to elaborate our catalytic conditions to the Friedel-Crafts reaction of indoles with α-amido sulfone 8 as a precursor of N-Boc α-imino ethyl glyoxylate. The use of imino derivatives of glyoxylates as electrophiles in aza-Friedel–Crafts reaction afforded the corresponding 3-indolyl glycine derivatives, an important class of nonproteinogenic amino acids useful for synthetic intermediates and building blocks for natural products such as dragmacidins.[14] Although some…

    Words: 843 - Pages: 4
  • Gabriel Amine Vs Pyrrole Lab Report

    Thus only NB atom can be protonated. Gabriel Amine Synthesis (Preparation of 1o amines) The Gabriel Amine synthesis is a three-step organic reaction that converts an alkyl halide to a primary amine. The advantage offered by Gabriel Amine synthesis is that it avoids poly-alkylation. Step 1: acid-base reaction. The acidic phthalimide molecule gets deprotonated by a strong base. The strength of an acid depends on the stability of the conjugate base. The negative charge on the conjugate base…

    Words: 1349 - Pages: 6
  • Polarimetry Resolution Of Phenylethylamine Lab Report

    the creation of the racemic mixture of phenylethylamine-(+)tartaric acid was made last week. (-)-ɑ-Phenylethylamine (+)-tartarate (+)-ɑ-Phenylethylamine (+)-tartarate This allowed the (+) enantiomer to be soluble in methanol while the (-) crystallized out in methanol. The methanol and solute where separated from the crystals. The crystals were then dissolved in 75 ml of 8% NaOH to separate the amine from the tartaric acid. Ethyl acetate was used to separate the amine from the…

    Words: 866 - Pages: 4
  • Paracetamol Lab Report

    Paracetamol is one of the world’s most beneficial and resourceful analgesic and is widely used in present day. An analgesic, can be defined, as a chemical compound that relieves pain, reduces fever and inflammation. It works by hindering the enzyme cyclooxygenase which acts a catalyst to convert fatty acids to prostaglandins. Prostaglandins cause pain and inflammation to peripheral and central points in the nervous system2. Paracetamol, or Acetaminophen is created by the synthesis and…

    Words: 651 - Pages: 3
  • Photochemical Reduction Of Co2 Essay

    Secilia Peraza A renewable amine for photochemical reduction of CO2 Summary Photochemical reduction of CO2 to produce formic acid is high in demand for renewable energy sources that create energy to produce transportable fuel by photosynthesis Artificial photosynthesis is a step forward for chemists in the photochemical reduction of carbon dioxide. Nevertheless, an often-neglected necessary ingredient for photochemical CO2 reduction is a sacrificial electron donor, such as a tertiary amine…

    Words: 918 - Pages: 4
  • Explain Why Propan-2-Ol Is Formed During The Reaction Between Propane

    thestructural difference between an aldehyde and a ketone? (A.C. 3.1) Aldehydes are known as the organic molecules that has a carbonyl group which is bonded to one hydrogen atom(at least) whereas in ketone is known as an organic compound that hold a carbonyl group that are attached and bonded to 2atoms of carbon. Their main difference is the location of the carbonyl group. Distinguish clearly between an amino group (in amines) and an amido group (in amides). A.C. 3.1) Amides are carboxylic acids…

    Words: 706 - Pages: 3
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