Reaction of bis(trifluoromethyl)amino-oxyl with alkylchlorosilanes and allyldichloro(methyl)silane and of perfluoro-2,5-diazahexane 2,5-dioxyl with vinylsilanes and hydrolysis of the products
作者:Anthony E. Tipping、Rajendraprasad B. Yadav
DOI:10.1016/0022-1139(93)02976-l
日期:1994.7
Treatment of the silanes MeSiHCl2, Me2SiHCl and EtSiMeCl2 with the oxyl (CF3)2NO. (1) gives the substitution products (CF3)2NOSiMeCl2 (4) and (CF3)2NOSiMe2Cl (5), and a mixture of (CF3)2NOCHMeSiMeCl2 (8) and (CF3)2NOCH2CH2SiMeCl2 (9) (ratio 20:37), respectively, while the silane EtSiMe2Cl affords mainly the ester (CF3)2NO2CMe (7). Attack of oxyl 1 on the silane CH2 = CHCH2SiMeCl2 results in both allylic substitution and addition to give the compounds CH2 = CHCH(SiMeCl2)ON(CF3)2 (14) and (CF3)2NOCH2CH(CH2SiMeCl2)ON(CF3)2 (15) (ratio 56:40). Reaction of the dioxyl . ON(CF3)CF2CF2N(CF3)O. (2) with the vinylsilanes CH2 = CHSiX3 (X3 = Me3, Cl3, MeCl2) gives mainly 1:1 copolymers [ON(CF3)CF2CF2N(CF3)OCH2CH(SiX3)]n (17), although the cyclic 1:1 adduct ON(CF3)CF2CF2N(CF3)OCH2CHSiMeCl2 (18) is also formed in low yield.Hydrolysis of the silanes 15, (CF3)2NOCH2CH(SiMeCl2)ON(CF3)2 (19a) and (CF3)2NOCH2CH(SiCl3)ON(CF3)2 (19b) affords the corresponding polysiloxanes 24 and 25, and the polysilsesquioxane 26, respectively; the polymers 25 and 26 undergo rearrangement of the type -CH(Si)ON(CF3)2 --> -CH(OSi)N(CF3)2 on storage. The 1:1 copolymers 17b (X3 = MeCl2) and 17c (X3 = Cl3) are also hydrolysed to the corresponding siloxane and silsesquioxane polymers. In contrast, hydrolysis of the compounds 4, 5 and (CF3)2NOCH2CH(OSiX3)N(CF3)2 (20a; X3 = MeCl2) and (20b; X3 = Cl3) results in Si-O bond cleavage.