Acyclic poly

Schiff Bases as Acyclic Poly dentate Ligands... 

Less explicit statements can be made concerning the origin of other sulfur-containing moieties (e.g., cyclic and acyclic (poly)sulfide moieties), since the Py-GC-MS method fails to properly characterise these functional groups. However, it is noteworthy that small amounts of alkylthiolanes and -thianes with linear carbon skeletons have been identified in kerogen pyrolysates (48), This suggests the presence of thiolane and thiane moieties in the kerogen... 

Yanagida, S., K. Takahashi, and M. Okahara, Solid-Solid-Liquid Three Phase Transfer Catalysis of Polymer Bound Acyclic Poly(oxyethylene) Derivatives Applications to Organic Synthesis, ... 

Yamamoto and coworkers reported that the com-plexation of allylic barium reagents with crown ethers, in particular 18C6, substantially improved the reactivity toward electrophiles, e.g., aldehydes, and a-regioselec-tivity of these organoalkyl derivatives in (Eq. 20). By contrast, only a negligible effect of acyclic poly ethers on the reaction was observed. 

Yanagida, S., and Takahashi, K., Losid-solid-liquid three phase transfer catalysis of polymer bound acyclic poly(oxyethylene) derivatives. Application to organic synthesis, J. Org. Chem., 44, 1099, 1979. 

In contrast, the synthesis of tetraethynylethene (TEE, C10H4) was described in 1991 and, since then, a rich variety of cyclic and acyclic molecular scaffolds incorporating this carbon-rich molecule as a construction module have been prepared. The majority of these compounds, such as the expanded radialenes or the oligomers and polymers of the poly(triacetylene) type, are highly stable and... 

Coordination studies of acyclic thioether ligands to silver(I) centers has also been studied. Poly(alkylthio)aromatic systems have been used to form supramolecular silver(I) compounds. With the ligand 2,3,5,6-tetrakis(isopropylthio)benzoquinone the compound has a linear chain structure in which silver(I) has a tetrahedral coordination.1156 A similar structure has the compound with the hexakis(methylthio)benzene,1157 but with the hexakis(tolylthio)benzene the silver... 

The final example in this section is the synthesis of a tristetrahydrofuran 2-606 described by the group of Rychnovsky [313]. Here, the tris(sulfate) 2-605 was converted into 2-606 by simply heating it in a mixture of MeCN and H20 (Scheme 2.138). The domino reaction is most likely initiated by deprotection of the primary alcohol, which then attacks the adjacent sulfonate unit in a SN2-type manner to afford the first furan moiety. Under the reaction conditions the formed acyclic sulfate is hydrolyzed affording a free secondary alcohol which then attacks the next adjacent cyclic sulfate unit. Overall, the SN2/hydrolyzation sequence proceeds three times to finally provide the poly(tetrahydrofuran) 2-606 as a single isomer in 93 % yield. 

Reggelin et al. reported the application of methylated, enantiomerically pure acyclic and cyclic 2-alkenyl sulfoximines 203 for the synthesis of highly substituted aza(poly)cyclic ring systems 204 under complete stereocontrol <06JA4023 06S2224>. 

K. Nomura, H. Morimoto, Y. Imanishi, Z. Ramhani, and Y. Geerts, Synthesis of high molecular weight rra i-poly(9,9-di- -octylfluorene-2,7-vinylene) by the acyclic diene metathesis polymerization using molybdenum catalysts, J. Polym. Sci., Part A Polym. Chem., 39 2463-2470, 2001. 

Intramolecular hydrogen bonding can be observed in dilute solutions of di and poly hydroxy compounds in CC14, where no intermolecular hydrogen bonds are formed. Under these conditions a number of cyclic and acyclic diols have two bonds and others have single band in the O-H stretching mode region. 

The Ba ISE containing the acyclic membrane carrier nonylphenoxy-poly(ethylenoxy)ethanol described by Levins [123] opened new fields in ion-selective electrodes based on synthetic acyclic ionophores. Simon and coworkers synthesized several hundred substances [3] that can be used for ISEs to determine alkaline earth ions, primarily Ca [4], and also [190], etc. (for a review, see [133, 154]). A natural ionophore for calcium is the antibiotic,... 

Recently, Scialdone and colleagues have employed phosgenated />-nitrophenyl(poly-styrene) ketoxime (Phoxime, 76) resin in the synthesis (via 77 and 78) of acyclic and heterocyclic amino-acid-derived ureas 79 too (Scheme 42). Resin 75 was first reacted with an amino acid and TMSCl in pyridine, and the resulting carbamate acid resin 77 was then coupled with an amine under standard carbodiimide protocol (HOBt/DIC in DMF) to obtain the carbamate amide resin 79. 

The higher seniority of cyclic suhunits over acyclic subunits (rule 3) and the higher seniority of a subunit with lower locant(s) relative to the same subunit with higher locant(s) (rule 7b) yield the CRU XVI with the name poly(cyclohexane-l,3-diylcyclohexane-l,4-diyl-l-methylpropane-l,3-diyl). Note that all acyclic subunits except CH2 and CH2CH2 are named as alkane-a, co-diyl. CH2 and CH2CH2 subunits are named methylene and ethylene, respectively. 

Materials that are constructed from organic polymers such as polyethylene, polystyrene, polyisoprene (natural rubber and a synthetic elastomer) and poly(vinyl chloride) are common features of our daily lives. Most of these and related organic polymers are generated from acyclic precursors by free radical, anionic, cationic or organometallic polymerisation processes or by condensation reactions. Cyclic precursors are rarely used for the production of organic polymers. 

Many classes of perfluoroethers such as acyclic [63], cyclic [64, 65], glymes [66,67], highly branched [63],macrocyclic [68-73], orthoformates [74-76] and poly-ethers [15, 77], have been succesfully prepared in high yield by direct fluorination techniques (Figs. 19 and 20). Carbon-oxygen bond cleavage is minimised in these processes by the addition of an HF scavenger, such as sodium fluoride, to the reaction mixture [14,45,46]. 

Acyclic [87, 88], cyclic, cage [89-91] and poly [91, 92]-perfluoroketones have been successfully synthesised by direct perfluorination (Figs. 29 and 30). 

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