Alkynen: Additie van Water

Additie van water op een alkyn

Dit is een mogelijke reactie om ketonen mee te bereiden.
Toevoegen van Kwik (Hg) kan de reactiesnelheid doen toenemen (enkel bij eindstandige alkynen).

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Alkylhalides: Introduction

Alkylhalides: an initiation Background information Alkylhalides are compounds (in this case salts ) that consist of an alkyl group and an halogen (seventh row in the table of Mendeljev). Alkylhalides have good leaving groups , these groups are the atoms (or the atom) that will be substituted or eliminated during elimination or substitution reactions on the molecule. This fenomenon is caused by the polar bond formed between the halogen and the alkyl group, making the halogen more afferent to be attacked (substituated / eliminated) by a nucleophile. Nucleophile substitution reaction ( SN2 reaction) A nucleophile 'attacks' the alkylhalide, the leaving group - in this case the halogen - will be taken of the compound and will be replaced (SUBSTITUTED) by the nucleophile (hense the reaction its name). This reaction however is characterized and depended by several factors including: the solvent in which the reaction is taking place the reactivity or acti...

Coca-Cola: Life - myth or truth?

"Coca-Cola Life" Recently the Coca-Cola company released a new beverage: the Coca-Cola Life drink. It should contain less sugar than the normal Coca-Cola drink; a part of the sugar is replaced with the recently approved sweetener from the Stevia plant (stevioglycosides). It's being sold as a 'natural' drink, but those stevioglycosides are as natural as the chemical sweetener aspartame found in Light and Zero drinks. However it is true that the amount of sugar is much lower (being reported as 33%, some say it's around 20%); yet approximately still 3-4 sugar cubes / 33 cl can (5-6 in a normal can). I bought it myself and found that the flavor has not really changed from the original Coca-Cola, however it does taste more "flat" - but definitely true it yourself. The outside of the can has the colour green. I personally do not associate this "healthy - natural" colour with Coca-Cola, but it's growing on me. In sum...

Painkillers: brand names for paracetamol (= acetaminophen) in foreign countries

Do you ever need a medication when in a foreign country, but in this country the medication you need is not available under a certain name? It's useful to know the active compound of the medication! In this case, I will present to you a list of brand names which contain paracetamol (= acetaminophen) throughout the world. When you are in the local pharmacy, ask about the active compound ("paracetamol" or "acetaminophen") and they will know immediately what you mean! If you talk about a brand from your own country it can take a while until the pharmacist knows what you mean. Useful : in almost all countries, generic brands are available, usually under the name of the active compound, so just ask for "paracetamol" or "acetaminophen" if you would like the cheapest product. Paracetamol = Acetaminophen EUROPE Austria: Ben-u-ron, Mexalen Belgium: Algostase, Dafalgan Croatia: Daleron, Lekadol, Plicet Czech Republic/Czechia: Paralen ...

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