Octyl silane

Octyl silane and butyl silane silica gels... 

The following table provides, for comparative purposes, eluotropic values on bonded octadecyl silane (ODS) and octyl silane (OS) for common solvents.12... 

It should be noted that functionalised diacetylene monomers have also been used for coupling reactions with haloarenes. By reacting diacetylene-substituted p-aminoanilines [135] and diethynyl(methyl)( -octyl)silane [136] with diiodoarenes, polyamides and polysilanes have been prepared, respectively. 

In Section 31.6 we mentioned the enantioselective reduction of itaconic acid by a number of entrapped chiral organometallic catalysts [25]. A follow-up and major improvement of that study was reported by Volovych et al. [30]. These authors hydrogenated itaconic acid with sol-gel-entrapped Rh complexed with (2S,4S)-l-tert-butoxycarbonyl-4-diphenylphosphino-2-(diphe-nylphosphinomethyl)pyrrolidine catalyst in methanol solutions. The immobilization process was carried out with different sol-gel precursors TMOS, TEOS, triethoxyphenylsilane PhSi(OEt)3/TMOS, and trimethoxy (octyl)silane OcSi(OMe)3/TMOS. The choice of the precursor was found to influence the enantioselectivity and the rate of the reaction. The immobilized catalyst could be recovered and recycled several times under N2 atmosphere. About 90-99% ee was achieved for the hydrogenation of itaconic acid to (S)-(+)-2-methyl succinic acid. 

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