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Browsing by Author "Perera, K. Sarath. D."

Browsing by Author "Perera, K. Sarath. D."

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  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2020-01)
    Isomers (compounds with the same chemical formula) can be broadly classified into (i) stereoisomers (e.g. geometrical and optical) with the same connectivity but having different spatial arrangements and (ii) structural ...
  • Perera, K. Sarath. D. (Institute of Chemistry, 2021-06)
    Mass spectrometry is an analytical technique used to obtain information on the structure and molecular weight/accurate mass of a given compound. The main components of the mass spectrometer are the ion source, mass ...
  • Perera, K. Sarath. D. (Institute of Chemistry, 2020-09)
    Carbon monoxide is a good π-acceptor and the M-C bond in metal carbonyls [M(CO)n ] has a significant π character. Thus, the M-C bond is strengthened and the carbon oxygen bond is weakened with the increase in back bonding.
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2021-04)
    We know that main group hydrides such as LiAlH4 and NaBH4 are the common reducing agents used by organic chemists to reduce aldehydes, ketones and carboxylic acids. Transition metal hydrides act as ...
  • Perera, K. Sarath. D. (Institute of chemistry Ceylon, 2022-10)
    Metathesis of simple salts is a double replacement reaction as shown below. AX + BY → AY + BX In Greek, “Metathesis” is known as the change of position or transposition. Olefin metathesis (OM) is the catalytic scission ...
  • Perera, K. Sarath. D. (Institute of Chemistry, 2021-06)
    In 1960, chemists at BASF developed the carbonylation of methanol into acetic acid. CH3 OH + CO CH3 COOH Monsanto process Monsanto Company introduced a new catalytic system in 1966. It is now known as the Monsanto ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2021-09)
    Organic chemistry is basically the study of synthesis, reactions, properties, and structures of carbon-containing compounds. Organic reactions can be classified into four main types: addition, elimination (E), substitution, ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2020-05)
    Coordinatively unsaturated metal centres (Mn+) (valence electron count, VEC<18) may undergo oxidative addition reactions to form saturated metal complexes by cleaving the X-Y bond of a molecule (e.g. H2 , O2 , ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2023-01)
    Palladium complexes catalyze many types of organic reactions. It is particularly useful in forming carbon- carbon bonds.
  • Perera, K. Sarath. D.; Theeshya Dulmini, A. D. (Institute of Chemistry Ceylon, 2021-09)
    Ancient Sri Lanka was well known as it was situated at the centre of the Silk Road. Ceylon cinnamon has become one of the main exports over a long period of time. According to “Mahavamsa” or the great chronicle of Sri ...
  • Perera, K. Sarath. D.; Theeshya Dulmini, A. D. (Institute of chemistry Ceylon, 2022-10)
    Nowadays people feel the need to enhance their immunity by consuming various nutritional food and beverages. From ancient times, Asian women have been using spices, not only to boost the taste and aroma, but also to ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2020-09)
    Reductive elimination (R.E.) is the opposite or the reverse of oxidative addition (O.A.), in which X-Y oxidatively adds on to Ln Mn+ to give Ln (X)(Y)M(n+2)+. LnM Y (n+2)+ X R.E. O.A. LnM n+ + X Y X and Y ...
  • Perera, K. Sarath. D. (Institute of chemistry Ceylon, 2023-06)
    Boron hydrides are a class of electron deficient compounds that have unusual bonding behavior and form cages and clusters. The electron deficient BH3 is the simplest boron hydride which exists as a dimer B2 H6 ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2020-05)
    A good knowledge in coordination and organometallic chemistry is very useful to a student, who wish to understand chemical transformations taking place around in nature and industry. It also helps to design synthetic ...
  • Perera, K. Sarath. D. (Institute of Chemistry Ceylon, 2020-01)
    Metal centres of d-block form coordination compounds with ligands which can donate a pair of electrons. These ligands are known as sigma donors or Lewis bases. Some ligands that consist of suitable vacant orbitals ...
  • Perera, K. Sarath. D.; Malawalaarachchi, Ovini N. (Institute of Chemistry Ceylon, 2020-09)
    Water is a truly amazing resource on Earth that nature offers us absolutely free of charge, and it is ranked second only to oxygen as being essential for life. More than 70% of the Earth’s surface is covered with ...