Alkoxy chemical synthesis

Several years later, Shi and Wudl reported a synthesis of the PPV derivative PPV-SOa (Scheme 14.2) that features a sulfonate-functionalized alkoxy side chain [14]. The material was synthesized by using the Wessling approach, and the sodium salt form of the material was water soluble. The study focused mainly on the chemical synthesis however, it was noted that aqueous solutions of PPY-SOa exhibit an intense absorption with X ,ax 510 nm. This absorption is very similar to that... 

The aluminiun complexes bearing nitrogen-based bidentate or tridentate ligands have recently attracted much attention in fine chemical synthesis and even more in polymerization reactions [57-64]. The synthesis of polyesters by alkoxy aluminum catalyst is attracting a considerable ciu-rent interest. The salalen aluminum complexes 59-63 were prepared (Scheme 6.12) and used for ROP of LA (Table 6.9) [65]. 

The palladium(II)-catalyzed olefin carbonylation reaction was first reported more than 30 years ago in studies by Stille and co-workers and James et al. The reaction of carbon monoxide with cis- and tra 5-but-2-ene in methanol in the presence of palladium(II)-chloride and copper(II)-chloride yielded threo- and eryt/zro-3-methoxy-2-methyl-butanoate, respectively. The transformation that was based on the well-known Wacker process for oxidation of ethylene into acetaldehyde in water " is now broadly defined as the Pd(II)-catalyzed oxycarbonylation of the unsaturated carbon-carbon bonds. This domino reaction includes oxypalladation of alkenes, migratory insertion of carbon monoxide, and alkoxylation. Since the development of this process, several transformations mediated by palladium(II) compounds have been described. The direct oxidative bisfunctionalization of alkenes represents a powerful transformation in the field of chemical synthesis. Palladium(II)-promoted carbonylation of alkenes in the presence of water/alcohol may lead to alkyl carboxylic acids (hydrocarboxylation), diesters [bis(aIkoxycarbonyla-tion)], (3-alkoxy carboxylic acids (alkoxy-carboxylation), or (3-alkoxy esters (alkoxy-carbonylation or alkoxy-alkoxy-carbonylation). Particularly attractive features of these multitransformation processes include the following ... 

This chapter will cover the synthesis, structure and chemical reactivity of various N-heteroatom-substituted hydroxamic esters, anomeric amides in which at least one of the heteroatom substituents at nitrogen is an alkoxyl group. Throughout this review, these will either be referred to as A-substituted hydroxamic esters or as A-substituted-A-alkoxy amides. 

The first synthesis of ethyl cyanate48 from 5-ethoxythiatriazole49 was briefly mentioned in the previous review of thiatriazoles.1 The thiatriazole decomposes smoothly in ethereal solution at 20° with formation of nitrogen, sulfur, and ethyl cyanate. Although several other methods are now available for the preparation of both alkyl and aryl cyanates the thiatriazole method prevails as the most generally applicable for the thermally and chemically sensitive alkyl cyanates, since the only by-products are inert—sulfur and nitrogen. Thus a number of 5-alkoxy,50-54 5-aryloxy,55-57 and 5-aralkoxythiatriazoles12,53 have been prepared. 

Purvis, R., Smalley, R.K., Strachan, W.A. and Suschitzky, H. (1978) The photolysis of o-azidobenzoic acid derivatives a practicable synthesis of 2-alkoxy-3-alkoxycarbonyl-3H-azepines. Journal of the Chemical Society, Perkin Transactions 1, (3), 191-195. 

N-Benzyl and iV-alkoxy pyridinium salts are suitable thermal and photochemical initiators for cationic polymerization, respectively. Attractive features of these salts are the concept of latency, easy synthetic procedures, their chemical stability and ease of handling owing to their low hygroscopicity. Besides their use as initiators, the applications of these salts in polymer synthesis are of interest. As shown in this article, a wide range of block and graft copolymer built from monomers with different chemical natures are accessible through their latency. 

Regarding this development, it is surprising that so far only one y-alkoxy-functionalized propyltriethoxysilane ((3-ethoxypropyl)triethoxysilane) has been described in the chemical literature [4, 5]. It was prepared from sodium ethoxide and (3-chloropropyl)triethoxysilane in an ether synthesis according to Williamson. This procedure is not suited for the synthesis of other alkoxypropyltriethoxysilanes because of the possible exchange of alkoxy groups [6],... 

Tung NT, Yu YJ, Kim K, Joo SH, Jin Jl. Synthesis of poly(p-xylylene) from a,a -bis(alkoxy or aryloxy)-p-xylenes by chemical vapor... 

The substituent. A, can be halogen, pseudohalogen, or many kinds of organic groups such as alkoxy, aryloxy, alkyl, and so forth Some can be prepared by direct synthesis and others are obtained by appropriate substitution reactions by nsing a suitable precursor. The physical and chemical properties of phosphazene compounds can be varied by choosing a wide variety of substituents. 

---