Stability analysis for a mathematical model of the lac operon

1334826 Perfluoroalkanesulphonamidomethyl silicon compounds BAYER AG 18 Feb 1972 [18 Feb 1971] 7607/72 Heading C3S Novel perfluoro-alkane-sulphonamido-methylsiloxyl compounds containing a structural unit of the formula and at least (3 - m) further structural units each of which individually corresponds either to the above structural unit or to one of the formulµ wherein R denotes H or a hydrocarbon radical, R 1 denotes a hydrocarbon radical, n is an integer of from 1 to 18, m is 0, 1 or 2, a is 1, 2 or 3, each value of R and R 1 being chosen independently of one another in each position of a molecule and the numbers n and a in each structural unit being chosen independently of the remaining structural units, are prepared by reacting a halomethylsiloxyl compound containing at least one structural unit of the formula (wherein X denotes Cl, Br or I), and at least (3 - m) further structural units each of which individually corresponds either to the above halomethyl-siloxyl structural unit or to one of the formulµ with a perfluoro-alkane-sulphonamide of the formula (wherein M denotes H or an alkali metal) at a temperature of between 20 and 200‹ C. and, where M denotes H, in the presence of an at least stoichiometrically equivalent amount of a tertiary nitrogen base. Products containing R 1 O 1/2 units may be hydrolysed, optionally in admixture with other silanes, to provide corresponding siloxanes. Uses.-For coating or impregnating glass, stone, wood, natural and synthetic fibres, paper and leather to impart oil-, dirt- and waterrepellent surfaces thereto.

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