76111-00-7Relevant academic research and scientific papers
STERIC EFFECTS IN HYDROSILYLATION OF STYRENE
Kuncova, Gabriela,Chvalovsky, Vaclav
, p. 2085 - 2099 (2007/10/02)
Hydrosilylation of styrene, 2-phenyl-1-propene, trans-1-phenyl-1-propene by (CH3)R2SiH (R=C2H5, i-C3H7, i-C4H9) and R3'SiH (R'=i-C3H7, t-C4H9) in the presence of 3> (I), 2> (II) and H2PtCl6 as catalysts has been studied.The reaction of styrene with (CH3)R2SiH catalysed by complex I in benzene leads to α- and β-adduct as well as to a substitution product.Analogous addition of (i-C3H7)3SiH catalysed by complexes I and II produces selectively trans-1-triisopropylsilyl-2-phenylethylene.Reaction of 2-phenyl-1-propene with CH3(C2H5)2SiH gives 1-diethylmethylsilyl-2-phenylpropane, 1-diethylmethylsilyl-2-phenyl-2-propene and 1-diethylmethylsilyl-2-phenyl-1-propene.Hydrosilylation of trans-1-phenyl-1-propene by diethylmethylsilane catalysed by complex I gave 1-diethylmethylsilyl-2-phenylpropane and 3-diethylmethylsilyl-1-phenylpropane.Conversion of 2-phenyl-1-propene and trans-1-phenyl-1-propene in their reaction with diethylmethylsilane catalysed by complex I was found to be much lower compared to the reaction with styrene and attained maximum at 60 deg C.The selectivity and rates of above reactions can be influenced by the presence of air oxygen.
The effect of solvents on hydrosilylation of phenylalkenes catalysed by 3>
Kuncova, Gabriela,Chvalovsky, Vaclav
, p. 2240 - 2246 (2007/10/02)
Hydrosilylation of styrene, 2-phenyl-1-propene and trans-1-phenyl-1-propene by trialkylsilicon hydrides of the type CH3R2SiH (R = C2H5, i-C3H7, i-C4H9) catalysed by 3> in the presence of benzene, 1,3,5-triethylbenzene, 1,2,3,4-tetraethylbenzene, pentaethylbenzene, hexaethylbenzene, 1,2,3,4-tetrahydronaphthalene, cyclohexane, tetrahydrofuran (THF), tributylphosphate (TBP), dimethylacetamide (DMA), trimethylphosphate (TMP), tributylphosphate (TBP) and hexamethylphosphorictriamide (HMPA) has been studied both in anaerobic conditions and in the presence of air oxygen.Aromatic solvents were found to affect the composition of reaction products similarly as benzene.The use of THF, TBF, TMP, DMA and HMPA as solvents for hydrosilylation of styrene by the above silanes suppresses formation of the α-adduct when the reaction is carried out under unaerobic conditions.The yields of hydrosilylation of 2-phenyl-1-propene and trans-1-phenyl-1-propene by CH3(C2H5)2SiH are decreased by the addition of THF, TBP, TMP and DMA while they are increased by using HMPA as the solvent.
