Cyclohexyl-cyclopentyl

R= cyclohexyl cyclopentyl cyclobutyl cyclopropyl isoamyl Me Et isopropyl... 

Fig. 9.1 Complexation of titanium to the incompletely condensed silsesquioxane R7Si7012H3 (R = cyclohexyl, cyclopentyl), yielding a catalyst active in the epoxidation of alkenes with TBHP.

A new parameter space for the synthesis of silsesquioxane precursors was defined by six different trichlorosilanes (R=cyclohexyl, cyclopentyl, phenyl, methyl, ethyl and tert-butyl) and three highly polar solvents [dimethyl sulfoxide (DMSO), water and formamide]. This parameter space was screened as a function of the activity in the epoxidation of 1-octene with tert-butyl hydroperoxide (TBHP) [26] displayed by the catalysts obtained after coordination of Ti(OBu)4 to the silsesquioxane structures. Fig. 9.4 shows the relative activities of the titanium silsesquioxanes together with those of the titanium silsesquioxanes obtained from silsesquioxanes synthesised in acetonitrile. The values are normalised to the activity of the complex obtained by reacting Ti(OBu)4 with the pure cyclopentyl silsesquioxane o7b3 [(c-C5H9)7Si7012Ti0C4H9]. 

R = nPr, iPr, cyclohexyl, cyclopentyl, fBu, Ph-C=C) to form heterocyclic enamines 27 which, after acid-catalyzed removal of the chiral C2-symmetrical amine, yielded the hexa-hydropyridazines 28 (six examples) with an ee of 90-91 %. The successful use of another chiral amine, [(5,5 )-3,5-dimethylmorpholine], gives further indication of the efficiency of asymmetric induction by means of coupling at the C-2 position of the diene. 

Li and coworkers reported the conjugate addition of alkyl groups to enamides mediated by zinc in aq. NH4CI to generate a -amino acid derivatives (Eq. 4.73). No reaction was observed in the absence of water. Both secondary and tertiary alkyl groups such as linear (2-butyl, 2-propyl, 2-pentyl), cyclic (cyclohexyl, cyclopentyl, cycloheptyl), and bulky ones (tert-butyl) were all transferred to the substrate successfully. Even simple primary iodides and methyl iodide provided the desired products in good yields. Miyabe et al. as well as Jang and Cho reported the addition of alkyl radicals from alkyl iodide to a,p unsaturated ketones, esters, and nitriles mediated by indium in aqueous media. Indium-mediated Michael addition of allyl bromide to l,l-dicyano-2-arylethenes also proceeded well in aqueous medium. ... 

The other copolymers of styryl-POSS and its blend with PS (nanocomposifes) have been reported. Haddad et al. described the preparation of three styrene copolymers with cyclohexyl-, cyclopentyl-, and isobutyl-substituted monofunctional styryl-POSS monomers (at 30 wt % or approximately 4mol % loadings) using free-radical bulk polymerization. The storage moduli, E, of these three POSS copolymers and polystyrene (PS) at room temperature are similar and typical for glassy polymers. However, at 30°C above the glass-transition temperature, the moduli of... 

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