Organic Help http://organicchemistrymessageboard.yuku.com/forums/1 en-us Copyright 2006, Yuku feeds@yuku.com (FeedMaster) webmaster@yuku.com (WebMaster) Sat, 07 Nov 2009 06:51:59 GMT Yuku Feeds 1.0 http://blogs.law.harvard.edu/tech/rss 60 Yuku http://static.yuku.com//feed/bypass/images/button-yuku.png http://organicchemistrymessageboard.yuku.com/forums/1 Yuku - free hosted forums and profiles 88 31 {pics-1.1 "http://www.icra.org/ratingsv02.html" l gen true for "http://yuku.com" r (nz 1 vz 1 lz 1 oz 1 cz 1 ) "http://www.rsac.org/ratingsv01.html" l gen true for "http://yuku.com" r (n 0 s 0 v 0 l 0 )) Search Search Domain q http://yuku.com/search/direct/ <![CDATA[ Cyromazine-insecticide and an acaricide ]]> http://organicchemistrymessageboard.yuku.com/topic/1687/t/Cyromazine-insecticide-and-an-acaricide.html Cyromazine is is a cyclopropyl derivative of melamine.It is a triazine insect growth regulator used as an insecticide and an acaricide.
Cyromazine works by affecting the nervous system of the immature larval stages of certain insects.In veterinary medicine, cyromazine is used as a ectoparasiticide. ]]> feeds@yuku.com (sunnye) http://organicchemistrymessageboard.yuku.com/topic/1687 Fri, 06 Nov 2009 07:52:21 GMT <![CDATA[ a Antihypertensive Drug-Cilnidipine ]]> http://organicchemistrymessageboard.yuku.com/topic/1686/t/a-Antihypertensive-Drug-Cilnidipine.html Cilnidipine is a dual blocker of L-type voltage-gated Ca2+ channels in vascular smooth muscle and N-type Ca2+ channels in sympathetic nerve terminals that supply blood vessels.
Cilnidipine has been developed as a slow-onset and long-lasting antihypertensive drug in Japan.
Recent electrophysiological data indicate that cilnidipine might be a dual-channel antagonist for peripheral neuronal N-type and vascular L-type... ]]> feeds@yuku.com (sunnye) http://organicchemistrymessageboard.yuku.com/topic/1686 Fri, 06 Nov 2009 07:51:06 GMT <![CDATA[ Dimethoate ]]> http://organicchemistrymessageboard.yuku.com/topic/1685/t/Dimethoate.html Dimethoate is a widely used organophosphate insecticide used to kill insects on contact. It was patented and introduced in the 1950s by American Cyanamid. Like other organophosphates, dimethoate is an anticholinesterase which disables cholinesterase, an enzyme essential for central nervous system function.

]]> feeds@yuku.com (sunnye) http://organicchemistrymessageboard.yuku.com/topic/1685 Fri, 06 Nov 2009 07:49:37 GMT <![CDATA[ Sodium bicarbonate ]]> http://organicchemistrymessageboard.yuku.com/topic/1684/t/Sodium-bicarbonate.html Sodium bicarbonate(144-55- is a white crystalline solid material and odorless. It is widely used in the food industry, in making rubber; in pharmaceuticals; as an antacid; in fire extinguishers, soap and detergents, rug cleaners, animal feeds, and textiles; in leather preparation; in soap, detergent, and paper manufacturing; for flue-gas scrubbing; and... ]]> feeds@yuku.com (sunnye) http://organicchemistrymessageboard.yuku.com/topic/1684 Fri, 06 Nov 2009 07:24:59 GMT <![CDATA[ 1H NMR & IR : unknown structure determination ]]> http://organicchemistrymessageboard.yuku.com/topic/1679/t/1H-NMR-IR-unknown-structure-determination.html
I was struggling in solving this question which is a part of a practice exam, and I need you to be patient with me and teach me step by step how to figure out the structure and how to read and analyze the spectra.

I attached the two 1H NMR & IR spectra so you will be able to know what structure I'm talking about.

I started with finding the saturation number which is 5 so I know that at least I have aromatic ring and double bond(s)
I predicted... ]]> feeds@yuku.com (dead actor) http://organicchemistrymessageboard.yuku.com/topic/1679 Sun, 01 Nov 2009 17:59:51 GMT <![CDATA[ Benzene ]]> http://organicchemistrymessageboard.yuku.com/topic/1675/t/Benzene.html Does 1,4 dimethylbenzene have to be orginized like this or can it be written on top right and bottom left
]]> feeds@yuku.com (Jason123) http://organicchemistrymessageboard.yuku.com/topic/1675 Sat, 31 Oct 2009 19:36:47 GMT <![CDATA[ asymmetric hydrogenation of olefin prochiral substrate ]]> http://organicchemistrymessageboard.yuku.com/topic/1672/t/asymmetric-hydrogenation-of-olefin-prochiral-substrate.html Dear all,

Now I am doing a research about producing chiral compound from olefin base prochiral substrate. I have tried to utilize short chain of olefin substrate such as dimethyl itaconate until dibutyl itaconate, but the results were not satisfying enough. Actually I want to try other olefin substrate with more bulky group which usually contain phenyl group. But I face a problem that usually the more bulky olefinic compounds exist in carboxylic acid form. Then I have to convert to... ]]> feeds@yuku.com (kiky) http://organicchemistrymessageboard.yuku.com/topic/1672 Thu, 29 Oct 2009 00:30:12 GMT <![CDATA[ structures of minor/major products ]]> http://organicchemistrymessageboard.yuku.com/topic/1666/t/structures-of-minor-major-products.html The question i'm working on asks: 2-methyl-1-butene can be formed by dehydrating two different alcohols (A and B) of molecular formula C5H12O. When A undergoes dehydration, 2-methyl-1-butene is formed as the only product of dehydration. Draw the structure of A. (what do i draw??? so confused. )

]]> feeds@yuku.com (ds90) http://organicchemistrymessageboard.yuku.com/topic/1666 Wed, 21 Oct 2009 23:25:49 GMT <![CDATA[ Acid/Base Extractions ]]> http://organicchemistrymessageboard.yuku.com/topic/1665/t/Acid-Base-Extractions.html feeds@yuku.com (isuckatchem) http://organicchemistrymessageboard.yuku.com/topic/1665 Wed, 21 Oct 2009 21:06:24 GMT <![CDATA[ Mass spec. Unexpected mass. ]]> http://organicchemistrymessageboard.yuku.com/topic/1664/t/Mass-spec-Unexpected-mass-.html Hi guys,

Been racking my brains over this for sometime - really still have no idea about what exactly I've got.
Attached is what I should have:

http://i53.photobucket.co...schmodie/20102009226.jpg

The molecular weight for this is 731.08.

Here are the two electrospray MS

feeds@yuku.com (schmo) http://organicchemistrymessageboard.yuku.com/topic/1664 Tue, 20 Oct 2009 03:07:59 GMT <![CDATA[ Unknown IR ]]> http://organicchemistrymessageboard.yuku.com/topic/1658/t/Unknown-IR.html Hello, my colleagues and I are grad students trying to come up with a structure for an unknown for a class. We need help trying to assign the IR bands, or some good literature that would help us do so. We have never seen a set of bands so intense past 3000 wn. Any help with the IR spectrum would be greatly appreciated.

Other information - MS mass 156 with the first fragment at 138.


feeds@yuku.com (Jnorthrup) http://organicchemistrymessageboard.yuku.com/topic/1658 Fri, 09 Oct 2009 06:56:18 GMT <![CDATA[ Unknown IR - sorry double post ]]> http://organicchemistrymessageboard.yuku.com/topic/1657/t/Unknown-IR-sorry-double-post.html Hello, my colleagues and I are grad students trying to come up with a structure for an unknown for a class. We need help trying to assign the IR bands, or some good literature that would help us do so. We have never seen a set of bands so intense past 3000 wn. Any help with the IR spectrum would be greatly appreciated.

Other information - MS mass 156 with the first fragment at 138.


... ]]> feeds@yuku.com (Jnorthrup) http://organicchemistrymessageboard.yuku.com/topic/1657 Fri, 09 Oct 2009 06:48:25 GMT <![CDATA[ elemental analysis ]]> http://organicchemistrymessageboard.yuku.com/topic/1655/t/elemental-analysis.html (methoxybenzene) before it "failed" elemental analysis according to JOC standards.

I started this by finding the theoretical amounts, but not sure where to go from there. Help pls!
]]> feeds@yuku.com (chiral224) http://organicchemistrymessageboard.yuku.com/topic/1655 Sat, 03 Oct 2009 11:25:13 GMT <![CDATA[ Skeletal formula of major product ]]> http://organicchemistrymessageboard.yuku.com/topic/1653/t/Skeletal-formula-of-major-product.html
Bromine in carbon tetrachloride (an inert solvent)______________________- ]]> feeds@yuku.com (nicnic300) http://organicchemistrymessageboard.yuku.com/topic/1653 Thu, 24 Sep 2009 13:30:22 GMT <![CDATA[ unknown need help please. ]]> http://organicchemistrymessageboard.yuku.com/topic/1651/t/unknown-need-help-please-.html Compound B is a slightly yellowish solid, which melts at 111-114 oC. When a small spatula-full of B is added to 5 mL of water, it appears to be very slightly soluble. Litmus is... ]]> feeds@yuku.com (organicfailure) http://organicchemistrymessageboard.yuku.com/topic/1651 Wed, 26 Aug 2009 18:59:38 GMT <![CDATA[ the anti-heroic protagonist ]]> http://organicchemistrymessageboard.yuku.com/topic/1650/t/the-anti-heroic-protagonist.html District 9, last month along with some ideas and questions about alien interaction and humanity. I hate to say it but with what I saw in the trailers, I was not surprised by much of the movie at all. Its outcome was never in doubt but I absolutely enjoyed watching HOW the movie took place even though I had predicted the general behavior of mankind... ]]> feeds@yuku.com (sunnye) http://organicchemistrymessageboard.yuku.com/topic/1650 Tue, 25 Aug 2009 03:26:39 GMT <![CDATA[ hydraulic oil and water chemistry ]]> http://organicchemistrymessageboard.yuku.com/topic/1647/t/hydraulic-oil-and-water-chemistry.html feeds@yuku.com (CharlieNH) http://organicchemistrymessageboard.yuku.com/topic/1647 Wed, 19 Aug 2009 15:17:37 GMT <![CDATA[ tert-Butyl acetate ]]> http://organicchemistrymessageboard.yuku.com/topic/1642/t/tert-Butyl-acetate.html tert-Butyl acetate, or t-butyl acetate is a colourless flammable liquid with a camphor- or blueberry-like smell. It is used as a solvent in the production of lacquers, enamels, inks, adhesives, thinners and industrial cleaners. It has recently gained EPA VOC exempt status.
Butyl acetate has four isomers: tert-butyl acetate, n-butyl acetate, isobutyl acetate, and... ]]> feeds@yuku.com (sunnye) http://organicchemistrymessageboard.yuku.com/topic/1642 Thu, 13 Aug 2009 03:07:34 GMT <![CDATA[ Zinc Undecylenate Powder is used for: ]]> http://organicchemistrymessageboard.yuku.com/topic/1639/t/Zinc-Undecylenate-Powder-is-used-for-.html Zinc Undecylenate Powder is used for:

Treating athlete's foot, jock itch, and ringworm. It may also be used for other conditions as determined by your doctor.Zinc Undecylenate Powder is an antifungal. It works by preventing fungal growth.

Do NOT use Zinc Undecylenate Powder if:

 feeds@yuku.com (sunnye) http://organicchemistrymessageboard.yuku.com/topic/1639 Tue, 04 Aug 2009 20:49:57 GMT <![CDATA[ Common Household Chemicals - Dangerous Mixtures ]]> http://organicchemistrymessageboard.yuku.com/topic/1634/t/Common-Household-Chemicals-Dangerous-Mixtures.html Some of the common chemicals found in your home shouldn't be mixed together. It's one thing to say "don't mix bleach with ammonia", but it's not always easy to know what products contain these two chemicals. Here's are some products you may have around the home that shouldn't be combined.

1,Bleach with Acid Toilet Bowl Cleaners
This mixture can result in toxic, potentially deadly fumes.
... ]]> feeds@yuku.com (sunnye) http://organicchemistrymessageboard.yuku.com/topic/1634 Wed, 22 Jul 2009 01:35:13 GMT