This application is a continuation-in-part application of application Ser. No. 688,808, filed Apr. 19, 1991 now U.S. Pat. No. 5,196,621.
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Number | Date | Country |
---|---|---|
0261730 | Mar 1988 | EPX |
1488521 | Oct 1977 | GBX |
1554942 | Oct 1979 | GBX |
Entry |
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Renger et al., "The Cyclodimerization of Butadiene on Cu-SiO.sub.2 Catalysts," Z. Chem., 19(5), 194-195 (1979). (Translation attached). |
Maxwell et al., "Cooper-Exchanged Zeolite Catalysts for the Cyclodimerization of Butadiene," Journal of Catalysis, 61, 485-492 (1980). |
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Number | Date | Country | |
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Parent | 688808 | Apr 1991 |