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ADDITION REACTIONS TO POLARIZED MULTIPLE BONDS The electron flow paths for addition The AdE2 Reaction: Electron Flow Pathways AE + A N

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BASIC RULES FOR MECHANISM STUDIES IN ORGANIC CHEMISTRY Carbon has 4 bonds – it is neutral. If it has 3 bonds, then look at number of electrons. None – positive - carbocation 1 electron – no charge – free radical 2 electrons – negative - carbanion Curly arrow : Atom where the arrow comes from – becomes less negative or positive. If it was an anion – atom becomes neutral

Many authorities predict that applications of nanotechnologies will ultimately pervade virtually every aspect of life and will enable dramatic advances to be realized in most areas of communication, health, manufacturing, materials and knowledge-based technologies. Even if this is only partially true, there is an obvious need to provide industry and research with suitable tools to assist the development, application and communication of the technologies. One essential tool in this armoury will be the harmonization of the terminology and definitions used in order to promote their common understanding and consistent usage. This terminology includes terms that are either specific to the sector covered by the title or are used with a specific meaning in the field of nanotechnology. It is one of a series of terminology PASs covering many different aspects of nanotechnologies. This terminology attempts not to include terms that are used in a manner consistent with a definition given in the Oxford English Dictionary [1], and terms that already have well established meanings and to which the addition of the prefix “nano” changes only the scale to which they apply but does not otherwise change their meaningThe multidisciplinary nature of nanotechnologies can lead to confusion as to the precise meaning of some terms because of differences in usage between disciplines. Users are advised that, in order to support the standardization of terminology, this PAS provides single definitions wherever possible