Carbonate link

Left and nght bonded carbons linked to the same nitrogen... 

Left bond means " bonded to 4-C right bond, bonded to 5-C " Left and right bonded carbons linked to the same nitrogen. 

In this case the longest continuous chain has five carbon atoms the compound is named as a derivative of pentane The key word here is continuous It does not matter whether the carbon skeleton is drawn m an extended straight chain form or m one with many bends and turns All that matters is the number of carbons linked together m an uninterrupted sequence... 

Very little is known about nucleophilic attack on an unsubstituted carbon atom of pyrazoles and their aromatic derivatives (pyrazolones, pyrazolium ions). The SwAr reaction of halogenopyrazoles will be discussed in Section 4.04.2.3.7. Sulfur nucleophiles do not attack the ring carbon atoms of pyrazolium salts but instead the substituent carbon linked to nitrogen with concomitant dequaternization (Section 4.04.2.3.lO(ii)). The ring opening of pyrazolium salts by hydroxide ion occurs only if carbon C-3 is unsubstituted the exact mechanism is unknown and perhaps involves an initial attack of OH on C-3. 

Activated Carbon for Process Water Treatment Activated Carbon from CPL Carbon Link - Activated carbon from CPL Carbon Link for liquid and gas phase purification by adsorption. Activated carbons for all applications including chemical, water, air, solvent recovery, gold recovery, food, automotive, industrial, catalysis.. http //www.activated-carbon.com. 

Trifluoromethyl groups are very resistant to hydrolysis, unless they are allylic or benzylic, or vicinal to a carbon linked to hydrogen. In the last case, elimination of hydrogen fluonde leads to the formation of a difluoromethylene group which is key to additional reactions... 

Dondoni, A. Massi, A. (2006) Design and Synthesis of New Classes of Heterocyclic C-Glycoconjugates and Carbon-Linked Sugar and Heterocyclic Amino Acids by Asymmetric Multicomponent Reactions (AMCRs). Accounts of Chemical Research, 39, 451M63. 

Landucci, L. L. Formation of carbon-linked anthrone-lignin and anthrahydroquinone-lignin adducts. J. Wood Chem. Technol. 1981, 1, 61-74. 

A suitable degree of esterification of dextran with butyric or palmitic acid is achieved by CDI in formamide or DMSO. In the absence of carboxylic acids dextran can be converted by CDI into a crosslinked product with intrachain as well as interchain carbonate links. Such carbonate links permit drugs containing hydroxyl groups to be coupled to the dextran.[174]... 

A. Dondoni, A. Marra, and M. G. Zampolli, Synthesis of all carbon linked glycoside clusters round benzene scaffold via Sonogashira-Heck-Cassar cross coupling of iodobenzenes with ethynyl C-glycosides, Synlett, 11 (2002) 1850-1854. 

A. Dondoni, M. Kleban, and A. Marra, The assembly of Carbon-linked calix-arene-carbohydrate structures (C-calixsugars) by multiple Wittig olefination, Tetrahedron Lett., 38 (1997) 7801-7804. 

Addition of lithiated heterocycles to aldonolactones yields carbon-linked nucleosides (56). Thus, the reaction of 2,3 5,6-di-O-isopropylidene-L-gu-lono-1,4-lactone (9b) or 2,3-O-isopropylidene-D-ribono-l,4-lactone (16a) with various lithiated heterocycles gave gulofuranosyl derivatives 53a-g or ribofuranosyl derivatives 54b,c. Gulonolactols 53a-g and ribonolactols 54b,c were acetylated with acetic anhydride in pyridine to yield their acetyl derivatives. The stereochemistry of compounds 53a-g and 54b,c was discussed in terms of the Cotton effect of circular-dichroism curves of the ring-opened alcohols formed upon reduction by sodium borohydride. The configuration at C-l of 53g was proved by means of X-ray analysis (57,58). 

Carbon-linked sugar-heterocycles were also obtained by reaction of the lithiated derivatives obtained from 2-bromopyridine, a-picoline, and ben-zothiazole with 4-0-benzyl-2,3 6,7-di-0-cydohexylidene-D-g(ycero-D-gulo-htplono-1,5-lactone (55). The corresponding o-glycero-D-gulo-hepto-pyranose-substituted compounds 56a-c were isolated in 35-43.5% yields. With other heterocycles (for example furan), 1-disubstituted guloheptitols were obtained (59). 

However, with allylzinc bromide the reaction afforded the vinylic metal intermediate 111 with the allyl group connected to the carbon linked to a methoxy group, which may afford a new allenic product via /3-elimination. 

The /-coordination polyhedra of the chiral zwitterions 81-84 in the crystal were found to be distorted trigonal bipyramids, with the two carbon-linked oxygen atoms in the axial positions. This is illustrated for 81 in Fig. 10. The crystals of 81-84 are built up by pairs of (A)- and (A)-enantiomers. Selected geometric parameters for these compounds are listed in Table XI. As can be seen from these data, the axial Si-O distances [1.749(2)-1.801(4) A] are significantly longer than the equatorial ones [1.683(2)-1.7182(14) A]. The Si-C distances are 1.866(6)-1.897(2) A. 

The properties are close to those of polyethylenes, with some differences due to the tertiary carbon linked to the backbone good mechanical properties at ambient temperature, low price, attractive price/property ratios, easy processing, chemical inertness, we absorption of water, low density, good electrical insulation even in wet media, feasibility of welding, versatility of processing methods, broad range of available melt flow rates (MFR). 

Another popular use for the element fluorine is the plastic called Teflon. This is a fluo-ropolymer consisting of long chainlike inert molecules of carbon linked chemically to fluorine. Teflon is useful as a coating for nonstick surfaces in cookware, ironing board covers, razor blades, and so forth. 

As structural analogues of the phenothiazines, thioxanthenes (e.g., chlorprothixene, flupentixol) possess a central nucleus in which the N atom is replaced by a carbon linked via a double bond to the side chain. Unlike the phenothiazines, they display an added thy-moleptk activity. 

First item in a series (for example, the first carbon linked to a carboxyl group). 2. Abbreviation for alpha particle. 3. Symbol for angle of optical rotation. 4. Symbol for degree of dissociation. 5. Symbol for electric polarizability of a molecule. 6. Often with a subscript number (i) the coefficient of [A] in the numerator of the generalized rate expression. 7. Symbol for is proportional to. 8. Symbol for Napierian absorption coefficient. 9. In brackets, symbol for specific optical rotation. 

A method for the determination of carbon-linked methyl groups (and, by extension, used in the analysis of chiral methyl groups in stereochemical studies of enzyme-catalyzed reactions acting on methyl groups). In this procedure, the methyl groups are converted to acetic acid by oxidation of the metabolite with chromic and sulfuric acids. Milder versions are also available. 

Dondoni A, Massi A, Aldhoun M (2007) Hantzsch-type three-component approach to a new family of carbon-linked glycosyl amino acids, synthesis of C-glycosylmethyl pyridylala-nines. J Org Chem 72 7677-7687... 

Dondoni A, Massi A (2006) Design and synthesis of new classes of Heterocyclic C-glycoconjugates and carbon-linked sugar and heterocyclic amino acids by asymmetric multicomponent reactions (AMCRs). Acc Chem Res 39 451-463... 

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