Nickel-catalyzed reactions of 3,4-benzo-1,1,2,2-tetraethyl-1,2-disilacyclobut-3-ene with carbonyl compounds
The reaction of 3,4-benzo-1,1,2,2-tetraethyldisilacyclobut-3-ene (1) with benzaldehyde in the presence of a catalytic amount of Ni(PEt3)4 at 150-degrees-C afforded 5,6-benzo-1,1,4,4-tetraethyl-2-oxa-3-phenyl-1,4-disilacyclohex-5-ene in 75% yield. Similar nickel-catalyzed reaction of 1 with acetone g...
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Published in | Organometallics Vol. 12; no. 1; pp. 87 - 90 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
WASHINGTON
American Chemical Society
01.01.1993
Amer Chemical Soc |
Subjects | |
Online Access | Get full text |
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Summary: | The reaction of 3,4-benzo-1,1,2,2-tetraethyldisilacyclobut-3-ene (1) with benzaldehyde in the presence of a catalytic amount of Ni(PEt3)4 at 150-degrees-C afforded 5,6-benzo-1,1,4,4-tetraethyl-2-oxa-3-phenyl-1,4-disilacyclohex-5-ene in 75% yield. Similar nickel-catalyzed reaction of 1 with acetone gave 5,6-benzo-1,1,4,4-tetraethyl-3,3-dimethyl-2-oxa-1,4-disilacyclohex-5-ene, 1-[diethyl(isopropenyloxy)silyl]-2-(diethylsilyl)benzene,and 4,5-benzo-1,1,3,3-tetraethyl-2-oxa-1,3-disilacyclopent-4-ene (6) in 26%, 31%, and 24% yields, respectively. Treatment of 1 with acetophenone, pinacolone, and propiophenone afforded the respective adducts, 1-[diethyl[(l-phenylvinyl)oxy]silyl]-, 1-[[(l-tert-butylvinyl)oxy]diethylsilyl]-, and 1-[diethyl[(l-phenyl-1-propenyl)oxy]silyl]-2-(diethylsilyl)benzene, in 59%, 27%, and 70% yields, respectively, in addition to 6. Similar treatment of 1 with benzophenone produced 4 ,5-benzo-1,1,3,3-tetraethyl-2,2-diphenyl-1,3-disilacyclopent-4-ene and 6 in 20% and 57% yields, while with 4,4'-dimethylbenzophenone, 1 gave 4,5-benzo-1,1,3,3-tetraethyl-2,2-di(p-tolyl)-1,3-disilacyclopent-4-ene and 6 in 16% and 37% yields. The reaction of 1 with benzophenone in the presence of the nickel catalyst in refluxing cyclohexene gave 7,7-diphenylnorcarane and 6 in 39% and 57% yields. |
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Bibliography: | istex:89091331B0340F30D64DEC898276E95839186F9A ark:/67375/TPS-T3051QDP-F |
ISSN: | 0276-7333 1520-6041 |
DOI: | 10.1021/om00025a018 |