Carbon functions

Bis-(P-hydroxyethyl) terephthalate and related compounds can be produced ia this manner using finely divided carbon catalyst (92). The carbon functions not only as a catalyst but also helps to remove color from the reaction mixture upon removal of the carbon by hot filtration. 

Carbon Dioxide Adsorption on Dried Polymer. Other unexpected interactions of these hydrolytic polymers have been noted previously during the measurement of infrared spectra of dried Pu(IV) polymers (like those used for diffraction studies). Vibrational bands first attributed to nitrate ion were observed in samples exposed to room air however, these bands were not present in samples prepared under nitrogen atmospheres (see Fig. 4) (6). Chemical analyses established enough carbon in the exposed samples to confirm the assignment of the extraneous bands to the carbonate functional group... 

Pharmacomodulated melatonin analogs were prepared by Berteina-Raboin et al. using SPOS [33]. C-2 carbon functionalized 5-carboxamido-... 

Clearly, the nitroalkene dipolarophile oxidoisoquinolinium betaine 123 is nonideal for the synthesis of the hetisine alkaloids, as mass throughput for the needed cycloadduct would be low, and conversion of the tertiary nitro group to carbon-based functionality, as would be required in the latter stages of the synthesis, could be problematic. On the other hand, an ene-nitrile dipolarophile has several potential advantages over nitroalkene dipolarophile. Most importantly, the ene-nitrile cycloadduct has carbon functionality installed at the C-10 position. Second, the conjugate addition byproduct pathway that occurs so readily for the nitroalkene oxidoisoquinolinium betaine 123 system (see Scheme 1.13) should be much slower... 

The second large group of reactions is characterised by the elaboration of the exocyclic double bond. This chemistry is particularly interesting because it allows the incorporation of a cyclopropyl ring in a more complex molecule, to take advantage of its peculiar feature as a reactive three-carbon functional group. 

The coupling reaction of a carbonate functional group with an amine is best done in slightly alkaline pH (7-9) and in the absence of any competing amine or sulfhydryl components. 

Table 1. Structural carbon distribution (%) of the humic acids extracted from soil horizons, adopted from Xing (2001). The distribution was calculated from solid state 13C Cross-Polarization Magic-Angle-Spinning (CP/MAS) NMR spectra. Chemical shift assignment for carbon functional groups alkyl 0-50 ppm O-alkyl 50-117 ppm aromatic 107-165 ppm.

Chemistry of Carbon-Functional Alkylidynetricobalt Nonacarbonyl Cluster Complexes, 14, 97... 

Fundamentally, O-esters of N-hydroxy-2-thiopyridone are photo-lyzed in the presence of an excess of white phosphorus in a methylene chloride/carbon disulfide medium. On solvent removal, hydrolysis, and oxidation with hydrogen peroxide, good yields of phosphonic acids (Figure 2.10) bearing the carbon functionality of the parent acid are isolated. 

Studies on the anxiolytic diazepams have been extended to compounds in which the imino nitrogen is replaced by a carbon function. A monoaza analogue (3) of diazepam was examined for anxiolytic activity by the antipentylenetetrazole test in rats, but it was found to be inactive [5]. Two 4-methyl deriva-... 

There have been very few reports of polysilanes containing a carbon functional group such as unsaturated groups directly attached to the silicon main chain. This appears to be due to the difficulties in synthesis and characterization due to instability of these compounds. These polymers are expected to show significant differences to conventional polysilanes in their properties due to the interaction of main-chain cr-electron and side-chain 7r-electron systems. 

Similarly, a double functionalization can be reached when an activating group is present in close vicinity to the triple bond. Tsuji et al. have discovered that with a diphosphine palladium(O) complex, a carbonate function in the a-position of the alkyne provides by decarboxylation a palladium methoxy species on which the alkyne moiety can be isomerized into an al-lenyl a -bonded group. CO insertion in the Pd - C bond, reductive elimination with the methoxy group and further cyclization with incorporation of a second CO molecule give rise to the corresponding cyclopentenone as shown in Scheme 21 [127]. 

Scheme 21 Carbonylation of enynes bearing a carbonate function in the a-position of the triple bond... 

In conclusion, many authors believed that VC was a rather effective additive for chemical modification of the anode SEE It not only reduced the irreversible capacity during the initial charging process of lithium ion cells, but it also improved the stability of the SEI at elevated temperatures. Because of VC participation, the new SEI chemistry contained polymeric species that stemmed from the reductive polymerization of VC, which was characterized by a high content of alkyl carbonate functionalities. Comparative studies of this additive in commercial lithium ion cells proved that VC presence improved cycle life performance. 

In addition, iodine snccessfnlly catalyzed the electrophilic snbstitntion reaction of indoles with aldehydes and ketones to bis(indonyl)methanes [225], the deprotection of aromatic acetates [226], esterifications [227], transesterifications [227], the chemoselective thioacetalization of carbon functions [228], the addition of mercaptans to a,P-nnsatnrated carboxylic acids [229], the imino-Diels-Alder reaction [230], the synthesis of iV-Boc protected amines [231], the preparation of alkynyl sngars from D-glycals [232], the preparation of methyl bisnlfate [233], and the synthesis of P-acetamido ketones from aromatic aldehydes, enolizable ketones or ketoesters and acetonitrile [234],... 

U Alkyl groups and further carbon functional groups. p-Tolyl derivative... 

Reactivity of substituents attached to ring heteroatoms 5.2.2.7 Alkyl groups and further carbon functional groups. The N-2-nitrobenzoyl derivative of indolo benzazepine 384a can be easily deprotected on the indole nitrogen by treatment with N,N-diethylaminoethylamine in DMF at room temperature (Scheme 79, Section 5.1.2 (1991JHC379)). 

Takata and Endo, 1988]. A cyclic carbonate and cyclic ether are eliminated as by-products in reaction pathways a and b, respectively. Polymer LXXIV contains both ether and carbonate functional groups in the polymer chain. 

A useful reaction involving substitution of carbon functionalities is decarboxylation of pyrazinecarboxylic acids. This conversion is readily achieved by heating directly or in high-boiling solvent, or distillation over copper compounds. Fusion under reduced pressure has been occasionally effective for the transformation <2002JOC556>. 

Further Carbon Functional Groups 3.2.3.4.1 Aryl groups... 

---