jueves, 26 de junio de 2008

REMEMBER GRIGNARD REAGENTS ??


Do you remember Grignards Reagents from your Organic Chemistry class????

Grignard reagents (R-Mg-X) are highly versatile tools for building carbon skeletons of complex organic molecules. While the chemistry of Grignard reagents has been known for over 100 years, their use in synthetic organic chemistry has never been more popular. As a producer of numerous specialty organic compounds, let us put our experience with Grignard reagents to work for you and your application!
Grignard Reagents are currently available from GFS Chemicals:
To use chart at right: Locate the desired 'R' (alkyl) group by row and halogen 'X' by column. The letters correspond to available solvents; T = tetrahydrofuran; E = diethyl ether.
As with all GFS Chemicals products, you'll enjoy the flexibility of being able to buy exactly how much material you need, from bottles to bulk – No more adapting your needs to the limitations of other suppliers' package offerings!
GFS Chemicals also carries a full line of anhydrous solvents suitable for Grignard systems, as well as materials for use as Grignard initiators:
Solvents: Ethyl ether, anhydrous (#916) Tetrahydrofuran (#2492) MTBE (#2268) n-butyl ether (#2639)
Initiators: cerium(III) chloride, anhydrous (#2902) iodine, prills (#2748)

Publicado por EMILIO MALAGUTI en 7:04

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GREEN CHEMICALS

The Green Seal certification is granted by the organization with that name and has a great number of members contributing with the requirements to pass a raw material or a chemical product as "green". Generally for a material to be green, has to comply with a series of characteristics like: near neutral pH, low volatility, non combustible, non toxic to aquatic life, be biodegradable as measured by oxygen demand in accordance with the OECD definition.
Also the materials have to meet with toxicity and health requirements regarding inhalation, dermal and eye contact. There is also a specific list of materials that are prohibited or restricted from formulations, like ozone-depleting compounds and alkylphenol ethoxylates amongst others. Please go to http://www.greenseal.com/ for complete information on their requirements.
For information on current issues regarding green chemicals, see the blog from the Journalist Doris De Guzman, in the ICIS at: http://www.icis.com/blogs/green-chemicals/.
Certification is an important — and confusing — aspect of green cleaning. Third-party certification is available for products that meet standards set by Green Seal, EcoLogo, Energy Star, the Carpet & Rug Institute and others.
Manufacturers can also hire independent labs to determine whether a product is environmentally preferable and then place the manufacturer’s own eco-logo on the product; this is called self-certification. Finally, some manufacturers label a product with words like “sustainable,” “green,” or “earth friendly” without any third-party verification.
“The fact that there is not a single authoritative standard to go by adds to the confusion,” says Steven L. Mack M.Ed., director of buildings and grounds service for Ohio University, Athens, Ohio.
In www.happi.com of June 2008 edition, there is a report of Natural formulating markets that also emphasises the fact that registration of "green formulas" is very confused at present, due to lack of direction and unification of criteria and that some governmental instittion (in my opinion the EPA) should take part in this very important issue.